{"id":566391,"date":"2026-07-16T09:51:35","date_gmt":"2026-07-16T02:51:35","guid":{"rendered":"https:\/\/hoanghamobile.com\/tin-tuc\/?p=566391"},"modified":"2026-07-16T09:51:35","modified_gmt":"2026-07-16T02:51:35","slug":"cong-thuc-tinh-quang-duong","status":"publish","type":"post","link":"https:\/\/hoanghamobile.com\/tin-tuc\/cong-thuc-tinh-quang-duong\/","title":{"rendered":"C\u00f4ng Th\u1ee9c T\u00ednh Qu\u00e3ng \u0110\u01b0\u1eddng: C\u00e1ch T\u00ednh To\u00e1n L\u1edbp 5 &#038; V\u1eadt L\u00fd L\u1edbp 8"},"content":{"rendered":"<p style=\"text-align: justify;\"><b>C\u00f4ng th\u1ee9c t\u00ednh qu\u00e3ng \u0111\u01b0\u1eddng<\/b><span style=\"font-weight: 400;\"> \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh b\u1eb1ng t\u00edch c\u1ee7a v\u1eadn t\u1ed1c nh\u00e2n v\u1edbi th\u1eddi gian di chuy\u1ec3n c\u1ee7a v\u1eadt. K\u00fd hi\u1ec7u chu\u1ea9n c\u1ee7a \u0111\u1ea1i l\u01b0\u1ee3ng n\u00e0y l\u00e0 s, \u0111\u01b0\u1ee3c t\u00ednh b\u1eb1ng bi\u1ec3u th\u1ee9c t\u1ed5ng qu\u00e1t s = v \u00d7 t. \u0110\u00e2y l\u00e0 m\u1ea3ng ki\u1ebfn th\u1ee9c n\u1ec1n t\u1ea3ng xu\u1ea5t hi\u1ec7n xuy\u00ean su\u1ed1t trong ch\u01b0\u01a1ng tr\u00ecnh To\u00e1n h\u1ecdc l\u1edbp 5 v\u00e0 \u0111\u01b0\u1ee3c n\u00e2ng cao th\u00e0nh chuy\u1ec3n \u0111\u1ed9ng c\u01a1 h\u1ecdc trong m\u00f4n V\u1eadt l\u00fd l\u1edbp 8. N\u1eafm ch\u1eafc c\u00f4ng th\u1ee9c n\u00e0y, b\u1ea1n s\u1ebd gi\u1ea3i nhanh m\u1ecdi d\u1ea1ng b\u00e0i chuy\u1ec3n \u0111\u1ed9ng \u0111\u1ec1u, \u0111\u1ed3ng th\u1eddi \u00e1p d\u1ee5ng linh ho\u1ea1t v\u00e0o t\u00ednh to\u00e1n l\u1ed9 tr\u00ecnh di chuy\u1ec3n ngo\u00e0i \u0111\u1eddi th\u1ef1c.<\/span><\/p>\n<h2 style=\"text-align: justify;\"><b>Qu\u00e3ng \u0111\u01b0\u1eddng b\u1eb1ng g\u00ec? C\u00f4ng th\u1ee9c s = v \u00d7 t t\u1ed5ng qu\u00e1t<\/b><\/h2>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Trong to\u00e1n chuy\u1ec3n \u0111\u1ed9ng \u0111\u1ec1u v\u00e0 v\u1eadt l\u00fd c\u01a1 h\u1ecdc, c\u00e2u h\u1ecfi &#8220;qu\u00e3ng \u0111\u01b0\u1eddng b\u1eb1ng g\u00ec&#8221; lu\u00f4n c\u00f3 m\u1ed9t \u0111\u00e1p \u00e1n \u0111\u1ed3ng nh\u1ea5t d\u1ef1a tr\u00ean m\u1ed1i quan h\u1ec7 gi\u1eefa ba \u0111\u1ea1i l\u01b0\u1ee3ng: Qu\u00e3ng \u0111\u01b0\u1eddng (s), V\u1eadn t\u1ed1c (v) v\u00e0 Th\u1eddi gian (t).<\/span><\/p>\n<p style=\"text-align: justify;\"><b>s = v \u00d7 t<\/b><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Trong \u0111\u00f3:<\/span><\/p>\n<ul style=\"text-align: justify;\">\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">s: Qu\u00e3ng \u0111\u01b0\u1eddng \u0111i \u0111\u01b0\u1ee3c c\u1ee7a v\u1eadt chuy\u1ec3n \u0111\u1ed9ng.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">v: V\u1eadn t\u1ed1c (t\u1ed1c \u0111\u1ed9) c\u1ee7a v\u1eadt tr\u00ean qu\u00e3ng \u0111\u01b0\u1eddng \u0111\u00f3.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">t: Th\u1eddi gian v\u1eadt chuy\u1ec3n \u0111\u1ed9ng \u0111\u1ec3 \u0111i h\u1ebft qu\u00e3ng \u0111\u01b0\u1eddng.<\/span><\/li>\n<\/ul>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Quy t\u1eafc ph\u00e1t bi\u1ec3u b\u1eb1ng l\u1eddi: Mu\u1ed1n t\u00ednh qu\u00e3ng \u0111\u01b0\u1eddng ta l\u1ea5y v\u1eadn t\u1ed1c nh\u00e2n v\u1edbi th\u1eddi gian chuy\u1ec3n \u0111\u1ed9ng c\u1ee7a v\u1eadt.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">T\u1eeb c\u00f4ng th\u1ee9c g\u1ed1c s = v \u00d7 t, ta d\u1ec5 d\u00e0ng suy ra hai c\u00f4ng th\u1ee9c li\u00ean quan \u0111\u1ec3 gi\u1ea3i c\u00e1c b\u00e0i to\u00e1n ng\u01b0\u1ee3c: khi bi\u1ebft qu\u00e3ng \u0111\u01b0\u1eddng v\u00e0 th\u1eddi gian th\u00ec v\u1eadn t\u1ed1c v = s \u00f7 t; khi bi\u1ebft qu\u00e3ng \u0111\u01b0\u1eddng v\u00e0 v\u1eadn t\u1ed1c th\u00ec th\u1eddi gian t = s \u00f7 v. Ba c\u00f4ng th\u1ee9c n\u00e0y lu\u00f4n \u0111i c\u00f9ng nhau v\u00e0 b\u1ed5 tr\u1ee3 cho nhau trong h\u1ea7u h\u1ebft c\u00e1c b\u00e0i t\u1eadp chuy\u1ec3n \u0111\u1ed9ng \u0111\u1ec1u.<\/span><\/p>\n<p><img fetchpriority=\"high\" decoding=\"async\" class=\"aligncenter size-full wp-image-566785\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/cong-thuc-tinh-quang-duong-3.jpg\" alt=\"cong-thuc-tinh-quang-duong-3\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/cong-thuc-tinh-quang-duong-3.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/cong-thuc-tinh-quang-duong-3-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/cong-thuc-tinh-quang-duong-3-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<h2 style=\"text-align: justify;\"><b>\u0110i\u1ec3m kh\u00e1c bi\u1ec7t gi\u1eefa c\u00f4ng th\u1ee9c t\u00ednh qu\u00e3ng \u0111\u01b0\u1eddng l\u1edbp 5 v\u00e0 l\u1edbp 8<\/b><\/h2>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">D\u00f9 \u00e1p d\u1ee5ng chung m\u1ed9t c\u1ea5u tr\u00fac bi\u1ec3u th\u1ee9c to\u00e1n h\u1ecdc, tuy nhi\u00ean c\u00e1ch ti\u1ebfp c\u1eadn \u1edf hai c\u1ea5p h\u1ecdc l\u1ea1i c\u00f3 nh\u1eefng \u0111\u1eb7c th\u00f9 ri\u00eang bi\u1ec7t v\u1ec1 m\u1eb7t ng\u1eef ngh\u0129a v\u00e0 h\u1ec7 th\u1ed1ng \u0111\u01a1n v\u1ecb.<\/span><\/p>\n<h3 style=\"text-align: justify;\"><b>C\u00f4ng th\u1ee9c t\u00ednh qu\u00e3ng \u0111\u01b0\u1eddng l\u1edbp 5 (M\u00f4n To\u00e1n)<\/b><\/h3>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">\u1ede b\u1eadc ti\u1ec3u h\u1ecdc, h\u1ecdc sinh \u0111\u01b0\u1ee3c ti\u1ebfp c\u1eadn v\u1edbi kh\u00e1i ni\u1ec7m &#8220;chuy\u1ec3n \u0111\u1ed9ng \u0111\u1ec1u&#8221;. C\u00e1c b\u00e0i to\u00e1n ch\u1ee7 y\u1ebfu t\u1eadp trung v\u00e0o vi\u1ec7c r\u00e8n luy\u1ec7n t\u01b0 duy \u0111\u1ed5i \u0111\u01a1n v\u1ecb \u0111o th\u1eddi gian (v\u00ed d\u1ee5: \u0111\u1ed5i t\u1eeb ph\u00fat, gi\u00e2y sang gi\u1edd) v\u00e0 gi\u1ea3i c\u00e1c d\u1ea1ng to\u00e1n th\u1ef1c t\u1ebf nh\u01b0 chuy\u1ec3n \u0111\u1ed9ng ng\u01b0\u1ee3c chi\u1ec1u (g\u1eb7p nhau) ho\u1eb7c chuy\u1ec3n \u0111\u1ed9ng c\u00f9ng chi\u1ec1u (\u0111u\u1ed5i nhau).<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">T\u01b0\u01a1ng t\u1ef1 nh\u01b0 to\u00e1n chuy\u1ec3n \u0111\u1ed9ng, c\u00e1c c\u00f4ng th\u1ee9c \u0111\u1ecbnh l\u01b0\u1ee3ng h\u00ecnh h\u1ecdc kh\u00e1c nh\u01b0 c\u00e1ch t\u00ednh<\/span><a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/dien-tich-hinh-tron\/\"> <span style=\"font-weight: 400;\">di\u1ec7n t\u00edch h\u00ecnh tr\u00f2n tr\u00ean th\u1ef1c t\u1ebf<\/span><\/a><span style=\"font-weight: 400;\"> c\u0169ng y\u00eau c\u1ea7u vi\u1ec7c \u0111\u1ed3ng b\u1ed9 \u0111\u01a1n v\u1ecb \u0111o tr\u01b0\u1edbc khi t\u00ednh to\u00e1n.<\/span><\/p>\n<h3 style=\"text-align: justify;\"><b>C\u00f4ng th\u1ee9c t\u00ednh qu\u00e3ng \u0111\u01b0\u1eddng l\u1edbp 8 (M\u00f4n V\u1eadt l\u00fd)<\/b><\/h3>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">L\u00ean ch\u01b0\u01a1ng tr\u00ecnh THCS, kh\u00e1i ni\u1ec7m n\u00e0y \u0111\u01b0\u1ee3c m\u1edf r\u1ed9ng th\u00e0nh chuy\u1ec3n \u0111\u1ed9ng c\u01a1 h\u1ecdc trong kh\u00f4ng gian. L\u00fac n\u00e0y, v\u1eadn t\u1ed1c v kh\u00f4ng ch\u1ec9 l\u00e0 m\u1ed9t h\u1eb1ng s\u1ed1 \u0111\u01a1n thu\u1ea7n m\u00e0 c\u00f3 th\u1ec3 l\u00e0 v\u1eadn t\u1ed1c trung b\u00ecnh (vtb) c\u1ee7a m\u1ed9t chuy\u1ec3n \u0111\u1ed9ng kh\u00f4ng \u0111\u1ec1u:<\/span><\/p>\n<p style=\"text-align: justify;\"><b>s = vtb \u00d7 t<\/b><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Ngo\u00e0i ra, h\u1ecdc sinh l\u1edbp 8 ph\u1ea3i l\u00e0m quen v\u1edbi vi\u1ec7c bi\u1ec3u di\u1ec5n c\u00e1c \u0111\u1ea1i l\u01b0\u1ee3ng d\u01b0\u1edbi d\u1ea1ng vect\u01a1 v\u00e0 x\u1eed l\u00fd c\u00e1c b\u00e0i to\u00e1n ph\u1ee9c t\u1ea1p h\u01a1n nh\u01b0 t\u00ednh c\u00f4ng c\u01a1 h\u1ecdc. Khi \u0111\u00f3, c\u00f4ng th\u1ee9c t\u00ednh s l\u1ea1i l\u00e0 m\u1ed9t bi\u1ebfn s\u1ed1 quan tr\u1ecdng n\u1eb1m trong m\u1ed1i quan h\u1ec7 v\u1edbi<\/span><a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/tinh-cong\/\"> <span style=\"font-weight: 400;\">c\u00f4ng th\u1ee9c t\u00ednh c\u00f4ng c\u01a1 h\u1ecdc l\u1ef1c F<\/span><\/a><span style=\"font-weight: 400;\"> hay c\u00e1c b\u00e0i to\u00e1n li\u00ean \u0111\u1edbi \u0111\u1ebfn<\/span><a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/cong-thuc-tinh-dien-tro\/\"> <span style=\"font-weight: 400;\">c\u00f4ng th\u1ee9c t\u00ednh \u0111i\u1ec7n tr\u1edf trong v\u1eadt l\u00fd<\/span><\/a><span style=\"font-weight: 400;\">.<\/span><\/p>\n<p><img decoding=\"async\" class=\"aligncenter size-full wp-image-566784\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/cong-thuc-tinh-quang-duong-2.jpg\" alt=\"cong-thuc-tinh-quang-duong-2\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/cong-thuc-tinh-quang-duong-2.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/cong-thuc-tinh-quang-duong-2-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/cong-thuc-tinh-quang-duong-2-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<h2 style=\"text-align: justify;\"><b>H\u01b0\u1edbng d\u1eabn c\u00e1c b\u01b0\u1edbc \u0111\u1ed3ng b\u1ed9 \u0111\u01a1n v\u1ecb \u0111o khi t\u00ednh qu\u00e3ng \u0111\u01b0\u1eddng<\/b><\/h2>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Sai l\u1ea7m l\u1edbn nh\u1ea5t c\u1ee7a \u0111\u1ea1i \u0111a s\u1ed1 h\u1ecdc sinh khi l\u00e0m b\u00e0i t\u1eadp t\u00ednh qu\u00e3ng \u0111\u01b0\u1eddng l\u00e0 \u0111\u1eb7t t\u00ednh ngay m\u00e0 kh\u00f4ng \u0111\u1ed3ng b\u1ed9 \u0111\u01a1n v\u1ecb. B\u1ea3ng quy chu\u1ea9n d\u01b0\u1edbi \u0111\u00e2y ch\u1ec9 ra c\u00e1c c\u1eb7p \u0111\u01a1n v\u1ecb b\u1eaft bu\u1ed9c ph\u1ea3i \u0111i li\u1ec1n v\u1edbi nhau:<\/span><\/p>\n<table>\n<tbody>\n<tr>\n<td><b>N\u1ebfu V\u1eadn t\u1ed1c (v) l\u00e0:<\/b><\/td>\n<td><b>Th\u00ec Th\u1eddi gian (t) ph\u1ea3i l\u00e0:<\/b><\/td>\n<td><b>Qu\u00e3ng \u0111\u01b0\u1eddng (s) thu \u0111\u01b0\u1ee3c s\u1ebd l\u00e0:<\/b><\/td>\n<\/tr>\n<tr>\n<td><b>km\/h<\/b><span style=\"font-weight: 400;\"> (Kil\u00f4m\u00e9t tr\u00ean gi\u1edd)<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Gi\u1edd (h)<\/span><\/td>\n<td><b>km<\/b><span style=\"font-weight: 400;\"> (Kil\u00f4m\u00e9t)<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>m\/s<\/b><span style=\"font-weight: 400;\"> (M\u00e9t tr\u00ean gi\u00e2y)<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Gi\u00e2y (s)<\/span><\/td>\n<td><b>m<\/b><span style=\"font-weight: 400;\"> (M\u00e9t)<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>m\/ph\u00fat<\/b><span style=\"font-weight: 400;\"> (M\u00e9t tr\u00ean ph\u00fat)<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Ph\u00fat (ph\u00fat)<\/span><\/td>\n<td><b>m<\/b><span style=\"font-weight: 400;\"> (M\u00e9t)<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">L\u01b0u \u00fd quan tr\u1ecdng: 1 gi\u1edd = 60 ph\u00fat = 3600 gi\u00e2y, v\u00e0 1 km = 1000 m. Mu\u1ed1n \u0111\u1ed5i t\u1eeb km\/h sang m\/s, ta l\u1ea5y gi\u00e1 tr\u1ecb chia cho 3,6; ng\u01b0\u1ee3c l\u1ea1i, \u0111\u1ed5i t\u1eeb m\/s sang km\/h th\u00ec nh\u00e2n v\u1edbi 3,6. Ch\u1ec9 khi v\u1eadn t\u1ed1c v\u00e0 th\u1eddi gian c\u00f9ng &#8220;h\u1ec7&#8221; th\u00ec k\u1ebft qu\u1ea3 qu\u00e3ng \u0111\u01b0\u1eddng m\u1edbi ch\u00ednh x\u00e1c.<\/span><\/p>\n<h2 style=\"text-align: justify;\"><b>C\u00e1c d\u1ea1ng b\u00e0i t\u1eadp c\u00f4ng th\u1ee9c t\u00ednh qu\u00e3ng \u0111\u01b0\u1eddng th\u01b0\u1eddng g\u1eb7p v\u00e0 l\u1eddi gi\u1ea3i chi ti\u1ebft<\/b><\/h2>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">B\u00e0i t\u1eadp t\u00ednh qu\u00e3ng \u0111\u01b0\u1eddng l\u00e0 m\u1ed9t trong nh\u1eefng d\u1ea1ng to\u00e1n c\u01a1 b\u1ea3n, th\u01b0\u1eddng xu\u1ea5t hi\u1ec7n trong ch\u01b0\u01a1ng tr\u00ecnh h\u1ecdc v\u00e0 c\u00e1c b\u00e0i ki\u1ec3m tra \u1edf nhi\u1ec1u c\u1ea5p \u0111\u1ed9. \u0110\u1ec3 gi\u1ea3i \u0111\u00fang v\u00e0 nhanh, ng\u01b0\u1eddi h\u1ecdc c\u1ea7n n\u1eafm v\u1eefng m\u1ed1i quan h\u1ec7 gi\u1eefa qu\u00e3ng \u0111\u01b0\u1eddng, v\u1eadn t\u1ed1c v\u00e0 th\u1eddi gian, \u0111\u1ed3ng th\u1eddi bi\u1ebft c\u00e1ch \u00e1p d\u1ee5ng c\u00f4ng th\u1ee9c ph\u00f9 h\u1ee3p cho t\u1eebng t\u00ecnh hu\u1ed1ng. Vi\u1ec7c luy\u1ec7n t\u1eadp c\u00e1c d\u1ea1ng b\u00e0i ph\u1ed5 bi\u1ebfn s\u1ebd gi\u00fap c\u1ee7ng c\u1ed1 ki\u1ebfn th\u1ee9c v\u00e0 n\u00e2ng cao k\u1ef9 n\u0103ng gi\u1ea3i to\u00e1n hi\u1ec7u qu\u1ea3.<\/span><\/p>\n<h3 style=\"text-align: justify;\"><b>D\u1ea1ng 1: Chuy\u1ec3n \u0111\u1ed9ng \u0111\u1ec1u c\u01a1 b\u1ea3n (To\u00e1n l\u1edbp 5 \/ V\u1eadt l\u00fd l\u1edbp 8)<\/b><\/h3>\n<ul style=\"text-align: justify;\">\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Ph\u01b0\u01a1ng ph\u00e1p: X\u00e1c \u0111\u1ecbnh \u0111\u00fang v v\u00e0 t, \u0111\u1ed5i v\u1ec1 c\u00f9ng \u0111\u01a1n v\u1ecb h\u1ee3p l\u1ec7 r\u1ed3i \u00e1p d\u1ee5ng h\u1ec7 th\u1ee9c s = v \u00d7 t.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">B\u00e0i t\u1eadp: M\u1ed9t ng\u01b0\u1eddi \u0111i xe m\u00e1y trong v\u00f2ng 2 gi\u1edd 30 ph\u00fat v\u1edbi v\u1eadn t\u1ed1c \u0111\u1ec1u l\u00e0 42 km\/h. T\u00ednh qu\u00e3ng \u0111\u01b0\u1eddng xe m\u00e1y \u0111\u00e3 \u0111i \u0111\u01b0\u1ee3c?<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">L\u1eddi gi\u1ea3i:<\/span>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"2\"><span style=\"font-weight: 400;\">\u0110\u1ed5i th\u1eddi gian: 2 gi\u1edd 30 ph\u00fat = 2,5 gi\u1edd<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"2\"><span style=\"font-weight: 400;\">Qu\u00e3ng \u0111\u01b0\u1eddng xe m\u00e1y \u0111i \u0111\u01b0\u1ee3c l\u00e0: s = v \u00d7 t = 42 \u00d7 2,5 = 105 km<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"2\"><span style=\"font-weight: 400;\">\u0110\u00e1p s\u1ed1: 105 km<\/span><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p><img decoding=\"async\" class=\"aligncenter size-full wp-image-566783\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/cong-thuc-tinh-quang-duong-1.jpg\" alt=\"cong-thuc-tinh-quang-duong-1\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/cong-thuc-tinh-quang-duong-1.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/cong-thuc-tinh-quang-duong-1-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/cong-thuc-tinh-quang-duong-1-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<h3 style=\"text-align: justify;\"><b>D\u1ea1ng 2: Chuy\u1ec3n \u0111\u1ed9ng c\u1ee7a hai v\u1eadt ng\u01b0\u1ee3c chi\u1ec1u nhau (B\u00e0i to\u00e1n g\u1eb7p nhau)<\/b><\/h3>\n<ul style=\"text-align: justify;\">\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Ph\u01b0\u01a1ng ph\u00e1p: Khi hai v\u1eadt chuy\u1ec3n \u0111\u1ed9ng ng\u01b0\u1ee3c chi\u1ec1u v\u00e0 xu\u1ea5t ph\u00e1t c\u00f9ng l\u00fac t\u1eeb hai \u0111\u1ecba \u0111i\u1ec3m A v\u00e0 B \u0111\u1ec3 g\u1eb7p nhau, qu\u00e3ng \u0111\u01b0\u1eddng AB s\u1ebd b\u1eb1ng t\u1ed5ng qu\u00e3ng \u0111\u01b0\u1eddng hai v\u1eadt \u0111i \u0111\u01b0\u1ee3c: s = (v1 + v2) \u00d7 t.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">B\u00e0i t\u1eadp: M\u1ed9t \u00f4 t\u00f4 \u0111i t\u1eeb A \u0111\u1ebfn B v\u1edbi v\u1eadn t\u1ed1c 50 km\/h. C\u00f9ng l\u00fac \u0111\u00f3, m\u1ed9t xe m\u00e1y \u0111i t\u1eeb B v\u1ec1 A v\u1edbi v\u1eadn t\u1ed1c 35 km\/h. Sau 2 gi\u1edd th\u00ec hai xe g\u1eb7p nhau. T\u00ednh \u0111\u1ed9 d\u00e0i qu\u00e3ng \u0111\u01b0\u1eddng AB?<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">L\u1eddi gi\u1ea3i:<\/span>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"2\"><span style=\"font-weight: 400;\">T\u1ed5ng v\u1eadn t\u1ed1c c\u1ee7a c\u1ea3 hai xe l\u00e0: v = 50 + 35 = 85 km\/h<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"2\"><span style=\"font-weight: 400;\">\u0110\u1ed9 d\u00e0i qu\u00e3ng \u0111\u01b0\u1eddng AB l\u00e0: s = v \u00d7 t = 85 \u00d7 2 = 170 km<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"2\"><span style=\"font-weight: 400;\">\u0110\u00e1p s\u1ed1: 170 km<\/span><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3 style=\"text-align: justify;\"><b>D\u1ea1ng 3: Chuy\u1ec3n \u0111\u1ed9ng c\u01a1 b\u1ea3n v\u1edbi th\u1eddi gian ngh\u1ec9<\/b><\/h3>\n<ul style=\"text-align: justify;\">\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Ph\u01b0\u01a1ng ph\u00e1p: Ch\u1ec9 t\u00ednh qu\u00e3ng \u0111\u01b0\u1eddng trong kho\u1ea3ng th\u1eddi gian v\u1eadt th\u1ef1c s\u1ef1 chuy\u1ec3n \u0111\u1ed9ng, b\u1ecf qua th\u1eddi gian d\u1eebng ngh\u1ec9, sau \u0111\u00f3 \u00e1p d\u1ee5ng s = v \u00d7 t.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">B\u00e0i t\u1eadp: M\u1ed9t xe m\u00e1y \u0111i v\u1edbi v\u1eadn t\u1ed1c 40 km\/h li\u00ean t\u1ee5c trong 3 gi\u1edd r\u1ed3i d\u1eebng ngh\u1ec9. H\u00e3y t\u00ednh qu\u00e3ng \u0111\u01b0\u1eddng xe m\u00e1y \u0111\u00e3 \u0111i \u0111\u01b0\u1ee3c?<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">L\u1eddi gi\u1ea3i:<\/span>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"2\"><span style=\"font-weight: 400;\">Qu\u00e3ng \u0111\u01b0\u1eddng xe m\u00e1y \u0111i \u0111\u01b0\u1ee3c l\u00e0: s = v \u00d7 t = 40 \u00d7 3 = 120 km<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"2\"><span style=\"font-weight: 400;\">\u0110\u00e1p s\u1ed1: 120 km<\/span><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h2 style=\"text-align: justify;\"><b>B\u00e0i t\u1eadp t\u1ef1 luy\u1ec7n<\/b><\/h2>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">B\u1ea1n h\u00e3y t\u1ef1 gi\u1ea3i c\u00e1c b\u00e0i t\u1eadp d\u01b0\u1edbi \u0111\u00e2y \u0111\u1ec3 c\u1ee7ng c\u1ed1 k\u1ef9 n\u0103ng \u00e1p d\u1ee5ng c\u00f4ng th\u1ee9c t\u00ednh qu\u00e3ng \u0111\u01b0\u1eddng:<\/span><\/p>\n<ul style=\"text-align: justify;\">\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">B\u00e0i 1: M\u1ed9t \u00f4 t\u00f4 \u0111i trong 1 gi\u1edd 30 ph\u00fat v\u1edbi v\u1eadn t\u1ed1c 54 km\/h. T\u00ednh qu\u00e3ng \u0111\u01b0\u1eddng \u00f4 t\u00f4 \u0111\u00e3 \u0111i. (G\u1ee3i \u00fd: \u0111\u1ed5i 1 gi\u1edd 30 ph\u00fat = 1,5 gi\u1edd; s = 54 \u00d7 1,5 = 81 km).<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">B\u00e0i 2: M\u1ed9t v\u1eadn \u0111\u1ed9ng vi\u00ean ch\u1ea1y v\u1edbi v\u1eadn t\u1ed1c 5 m\/s trong 12 gi\u00e2y. T\u00ednh qu\u00e3ng \u0111\u01b0\u1eddng \u0111\u00e3 ch\u1ea1y. (G\u1ee3i \u00fd: s = 5 \u00d7 12 = 60 m).<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">B\u00e0i 3: Hai ng\u01b0\u1eddi xu\u1ea5t ph\u00e1t c\u00f9ng l\u00fac, \u0111i ng\u01b0\u1ee3c chi\u1ec1u t\u1eeb A v\u00e0 B v\u1edbi v\u1eadn t\u1ed1c l\u1ea7n l\u01b0\u1ee3t 12 km\/h v\u00e0 18 km\/h, g\u1eb7p nhau sau 30 ph\u00fat. T\u00ednh \u0111\u1ed9 d\u00e0i AB. (G\u1ee3i \u00fd: \u0111\u1ed5i 30 ph\u00fat = 0,5 gi\u1edd; s = (12 + 18) \u00d7 0,5 = 15 km).<\/span><\/li>\n<\/ul>\n<h2 style=\"text-align: justify;\"><b>\u1ee8ng d\u1ee5ng th\u1ef1c t\u1ebf c\u1ee7a c\u00f4ng th\u1ee9c t\u00ednh qu\u00e3ng \u0111\u01b0\u1eddng<\/b><\/h2>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Kh\u00f4ng ch\u1ec9 n\u1eb1m tr\u00ean trang s\u00e1ch, c\u00f4ng th\u1ee9c s = v \u00d7 t g\u1eafn li\u1ec1n v\u1edbi v\u00f4 s\u1ed1 t\u00ecnh hu\u1ed1ng h\u1eb1ng ng\u00e0y. Khi l\u00ean k\u1ebf ho\u1ea1ch cho m\u1ed9t chuy\u1ebfn \u0111i, b\u1ea1n c\u00f3 th\u1ec3 \u01b0\u1edbc l\u01b0\u1ee3ng th\u1eddi gian t\u1edbi n\u01a1i d\u1ef1a tr\u00ean qu\u00e3ng \u0111\u01b0\u1eddng v\u00e0 t\u1ed1c \u0111\u1ed9 trung b\u00ecnh d\u1ef1 ki\u1ebfn. C\u00e1c \u1ee9ng d\u1ee5ng b\u1ea3n \u0111\u1ed3, \u0111\u1ecbnh v\u1ecb GPS c\u0169ng d\u1ef1a tr\u00ean nguy\u00ean l\u00fd n\u00e0y \u0111\u1ec3 t\u00ednh to\u00e1n th\u1eddi gian di chuy\u1ec3n v\u00e0 \u0111\u1ec1 xu\u1ea5t l\u1ed9 tr\u00ecnh. Trong th\u1ec3 thao, hu\u1ea5n luy\u1ec7n vi\u00ean d\u00f9ng c\u00f4ng th\u1ee9c \u0111\u1ec3 theo d\u00f5i t\u1ed1c \u0111\u1ed9 v\u00e0 qu\u00e3ng \u0111\u01b0\u1eddng ch\u1ea1y c\u1ee7a v\u1eadn \u0111\u1ed9ng vi\u00ean, t\u1eeb \u0111\u00f3 \u0111i\u1ec1u ch\u1ec9nh gi\u00e1o \u00e1n t\u1eadp luy\u1ec7n ph\u00f9 h\u1ee3p.<\/span><\/p>\n<h2 style=\"text-align: justify;\"><b>C\u00e1c c\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p (FAQ)<\/b><\/h2>\n<h3 style=\"text-align: justify;\"><b>N\u1ebfu v\u1eadt \u0111\u1ee9ng y\u00ean kh\u00f4ng chuy\u1ec3n \u0111\u1ed9ng th\u00ec c\u00f4ng th\u1ee9c t\u00ednh qu\u00e3ng \u0111\u01b0\u1eddng b\u1eb1ng bao nhi\u00eau?<\/b><\/h3>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Khi v\u1eadt \u0111\u1ee9ng y\u00ean, v\u1eadn t\u1ed1c c\u1ee7a v\u1eadt b\u1eb1ng 0 (v = 0). Theo c\u00f4ng th\u1ee9c s = 0 \u00d7 t = 0, qu\u00e3ng \u0111\u01b0\u1eddng \u0111i \u0111\u01b0\u1ee3c c\u1ee7a v\u1eadt trong su\u1ed1t kho\u1ea3ng th\u1eddi gian \u0111\u00f3 s\u1ebd b\u1eb1ng 0.<\/span><\/p>\n<h3 style=\"text-align: justify;\"><b>L\u00e0m sao \u0111\u1ec3 t\u00ednh qu\u00e3ng \u0111\u01b0\u1eddng khi bi\u1ebft v\u1eadn t\u1ed1c v\u00e0 th\u1eddi gian kh\u00f4ng c\u00f9ng h\u1ec7 \u0111\u01a1n v\u1ecb?<\/b><\/h3>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">B\u1ea1n b\u1eaft bu\u1ed9c ph\u1ea3i th\u1ef1c hi\u1ec7n b\u01b0\u1edbc \u0111\u1ed5i \u0111\u01a1n v\u1ecb tr\u01b0\u1edbc khi t\u00ednh to\u00e1n. V\u00ed d\u1ee5, n\u1ebfu v\u1eadn t\u1ed1c l\u00e0 60 km\/h v\u00e0 th\u1eddi gian l\u00e0 15 ph\u00fat, b\u1ea1n ph\u1ea3i \u0111\u1ed5i 15 ph\u00fat = 15\/60 = 0,25 gi\u1edd. Sau \u0111\u00f3 m\u1edbi \u00e1p d\u1ee5ng t\u00ednh: s = 60 \u00d7 0,25 = 15 km.<\/span><\/p>\n<h3 style=\"text-align: justify;\"><b>C\u00f4ng th\u1ee9c t\u00ednh v\u1eadn t\u1ed1c v\u00e0 th\u1eddi gian suy ra t\u1eeb \u0111\u00e2u?<\/b><\/h3>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">C\u1ea3 hai \u0111\u1ec1u suy ra t\u1eeb c\u00f4ng th\u1ee9c g\u1ed1c s = v \u00d7 t. Chuy\u1ec3n v\u1ebf, ta c\u00f3 v\u1eadn t\u1ed1c v = s \u00f7 t (qu\u00e3ng \u0111\u01b0\u1eddng chia th\u1eddi gian) v\u00e0 th\u1eddi gian t = s \u00f7 v (qu\u00e3ng \u0111\u01b0\u1eddng chia v\u1eadn t\u1ed1c). Nh\u1edd v\u1eady, ch\u1ec9 c\u1ea7n bi\u1ebft hai trong ba \u0111\u1ea1i l\u01b0\u1ee3ng, b\u1ea1n lu\u00f4n t\u00ecm \u0111\u01b0\u1ee3c \u0111\u1ea1i l\u01b0\u1ee3ng c\u00f2n l\u1ea1i.<\/span><\/p>\n<h3 style=\"text-align: justify;\"><b>Trong chuy\u1ec3n \u0111\u1ed9ng tr\u00f2n, c\u00f4ng th\u1ee9c t\u00ednh qu\u00e3ng \u0111\u01b0\u1eddng c\u00f3 g\u00ec thay \u0111\u1ed5i kh\u00f4ng?<\/b><\/h3>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Trong chuy\u1ec3n \u0111\u1ed9ng tr\u00f2n \u0111\u1ec1u, qu\u00e3ng \u0111\u01b0\u1eddng \u0111i \u0111\u01b0\u1ee3c ch\u00ednh l\u00e0 \u0111\u1ed9 d\u00e0i cung tr\u00f2n m\u00e0 v\u1eadt qu\u00e9t qua. N\u00f3 v\u1eabn \u0111\u01b0\u1ee3c t\u00ednh b\u1eb1ng c\u00f4ng th\u1ee9c s = v \u00d7 t, trong \u0111\u00f3 v l\u00e0 t\u1ed1c \u0111\u1ed9 d\u00e0i. N\u1ebfu bi\u1ebft t\u1ed1c \u0111\u1ed9 g\u00f3c \u03c9 (radian\/gi\u00e2y) v\u00e0 b\u00e1n k\u00ednh qu\u1ef9 \u0111\u1ea1o R, ta c\u00f3 th\u1ec3 t\u00ednh theo c\u00f4ng th\u1ee9c s = \u03c9 \u00d7 R \u00d7 t.<\/span><\/p>\n<h3 style=\"text-align: justify;\"><b>\u0110\u01a1n v\u1ecb c\u1ee7a qu\u00e3ng \u0111\u01b0\u1eddng ph\u1ee5 thu\u1ed9c v\u00e0o y\u1ebfu t\u1ed1 n\u00e0o?<\/b><\/h3>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">\u0110\u01a1n v\u1ecb c\u1ee7a qu\u00e3ng \u0111\u01b0\u1eddng ph\u1ee5 thu\u1ed9c tr\u1ef1c ti\u1ebfp v\u00e0o \u0111\u01a1n v\u1ecb c\u1ee7a v\u1eadn t\u1ed1c v\u00e0 th\u1eddi gian. N\u1ebfu v\u1eadn t\u1ed1c t\u00ednh b\u1eb1ng km\/h v\u00e0 th\u1eddi gian b\u1eb1ng gi\u1edd th\u00ec qu\u00e3ng \u0111\u01b0\u1eddng ra km; n\u1ebfu v\u1eadn t\u1ed1c b\u1eb1ng m\/s v\u00e0 th\u1eddi gian b\u1eb1ng gi\u00e2y th\u00ec qu\u00e3ng \u0111\u01b0\u1eddng ra m\u00e9t. \u0110\u00e2y l\u00e0 l\u00fd do b\u01b0\u1edbc \u0111\u1ed3ng b\u1ed9 \u0111\u01a1n v\u1ecb lu\u00f4n ph\u1ea3i l\u00e0m \u0111\u1ea7u ti\u00ean.<\/span><\/p>\n<h2 style=\"text-align: justify;\"><b>K\u1ebft lu\u1eadn<\/b><\/h2>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Vi\u1ec7c ghi nh\u1edb v\u00e0 \u00e1p d\u1ee5ng linh ho\u1ea1t <\/span><b>c\u00f4ng th\u1ee9c t\u00ednh qu\u00e3ng \u0111\u01b0\u1eddng<\/b><span style=\"font-weight: 400;\"> s = v \u00d7 t kh\u00f4ng ch\u1ec9 gi\u00fap c\u00e1c b\u1ea1n h\u1ecdc sinh gi\u1ea3i quy\u1ebft g\u1ecdn g\u00e0ng c\u00e1c b\u00e0i ki\u1ec3m tra To\u00e1n l\u1edbp 5 hay V\u1eadt l\u00fd l\u1edbp 8, m\u00e0 c\u00f2n c\u00f3 t\u00ednh \u1ee9ng d\u1ee5ng th\u1ef1c ti\u1ec5n r\u1ea5t cao khi t\u00ednh to\u00e1n th\u1eddi gian, l\u1ed9 tr\u00ecnh di chuy\u1ec3n ngo\u00e0i \u0111\u1eddi th\u1ef1c. Ch\u1ec9 c\u1ea7n n\u1eafm ch\u1eafc m\u1ed1i quan h\u1ec7 gi\u1eefa qu\u00e3ng \u0111\u01b0\u1eddng, v\u1eadn t\u1ed1c, th\u1eddi gian v\u00e0 lu\u00f4n \u0111\u1ed3ng b\u1ed9 \u0111\u01a1n v\u1ecb tr\u01b0\u1edbc khi \u0111\u1eb7t t\u00ednh, b\u1ea1n s\u1ebd t\u1ef1 tin x\u1eed l\u00fd m\u1ecdi d\u1ea1ng b\u00e0i chuy\u1ec3n \u0111\u1ed9ng \u0111\u1ec1u.<\/span><\/p>\n<p style=\"text-align: justify;\"><b>Xem th\u00eam:<\/b><\/p>\n<ul>\n<li>\n<p class=\"elementor-heading-title elementor-size-default\"><a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/dien-tro-la-gi\/\">\u0110i\u1ec7n Tr\u1edf L\u00e0 G\u00ec? Kh\u00e1i Ni\u1ec7m, C\u00f4ng Th\u1ee9c T\u00ednh, C\u00e1ch \u0110\u1ecdc<\/a><\/p>\n<\/li>\n<li>\n<p class=\"elementor-heading-title elementor-size-default\"><a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/dien-tich-hinh-tron\/\">C\u00f4ng Th\u1ee9c T\u00ednh Di\u1ec7n T\u00edch H\u00ecnh Tr\u00f2n V\u00e0 B\u00e0i T\u1eadp \u00c1p D\u1ee5ng<\/a><\/p>\n<\/li>\n<\/ul>\n<p><script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"N\u1ebfu v\u1eadt \u0111\u1ee9ng y\u00ean kh\u00f4ng chuy\u1ec3n \u0111\u1ed9ng th\u00ec c\u00f4ng th\u1ee9c t\u00ednh qu\u00e3ng \u0111\u01b0\u1eddng b\u1eb1ng bao nhi\u00eau?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Khi v\u1eadt \u0111\u1ee9ng y\u00ean, v\u1eadn t\u1ed1c c\u1ee7a v\u1eadt b\u1eb1ng 0 (v = 0). Theo c\u00f4ng th\u1ee9c s = 0 \u00d7 t = 0, qu\u00e3ng \u0111\u01b0\u1eddng \u0111i \u0111\u01b0\u1ee3c c\u1ee7a v\u1eadt trong su\u1ed1t kho\u1ea3ng th\u1eddi gian \u0111\u00f3 s\u1ebd b\u1eb1ng 0.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"L\u00e0m sao \u0111\u1ec3 t\u00ednh qu\u00e3ng \u0111\u01b0\u1eddng khi bi\u1ebft v\u1eadn t\u1ed1c v\u00e0 th\u1eddi gian kh\u00f4ng c\u00f9ng h\u1ec7 \u0111\u01a1n v\u1ecb?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"B\u1ea1n b\u1eaft bu\u1ed9c ph\u1ea3i th\u1ef1c hi\u1ec7n b\u01b0\u1edbc \u0111\u1ed5i \u0111\u01a1n v\u1ecb tr\u01b0\u1edbc khi t\u00ednh to\u00e1n. V\u00ed d\u1ee5, n\u1ebfu v\u1eadn t\u1ed1c l\u00e0 60 km\/h v\u00e0 th\u1eddi gian l\u00e0 15 ph\u00fat, b\u1ea1n ph\u1ea3i \u0111\u1ed5i 15 ph\u00fat = 15\/60 = 0,25 gi\u1edd. Sau \u0111\u00f3 m\u1edbi \u00e1p d\u1ee5ng t\u00ednh: s = 60 \u00d7 0,25 = 15 km.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"C\u00f4ng th\u1ee9c t\u00ednh v\u1eadn t\u1ed1c v\u00e0 th\u1eddi gian suy ra t\u1eeb \u0111\u00e2u?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"C\u1ea3 hai \u0111\u1ec1u suy ra t\u1eeb c\u00f4ng th\u1ee9c g\u1ed1c s = v \u00d7 t. Chuy\u1ec3n v\u1ebf, ta c\u00f3 v\u1eadn t\u1ed1c v = s \u00f7 t (qu\u00e3ng \u0111\u01b0\u1eddng chia th\u1eddi gian) v\u00e0 th\u1eddi gian t = s \u00f7 v (qu\u00e3ng \u0111\u01b0\u1eddng chia v\u1eadn t\u1ed1c). Nh\u1edd v\u1eady, ch\u1ec9 c\u1ea7n bi\u1ebft hai trong ba \u0111\u1ea1i l\u01b0\u1ee3ng, b\u1ea1n lu\u00f4n t\u00ecm \u0111\u01b0\u1ee3c \u0111\u1ea1i l\u01b0\u1ee3ng c\u00f2n l\u1ea1i.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Trong chuy\u1ec3n \u0111\u1ed9ng tr\u00f2n, c\u00f4ng th\u1ee9c t\u00ednh qu\u00e3ng \u0111\u01b0\u1eddng c\u00f3 g\u00ec thay \u0111\u1ed5i kh\u00f4ng?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Trong chuy\u1ec3n \u0111\u1ed9ng tr\u00f2n \u0111\u1ec1u, qu\u00e3ng \u0111\u01b0\u1eddng \u0111i \u0111\u01b0\u1ee3c ch\u00ednh l\u00e0 \u0111\u1ed9 d\u00e0i cung tr\u00f2n m\u00e0 v\u1eadt qu\u00e9t qua. N\u00f3 v\u1eabn \u0111\u01b0\u1ee3c t\u00ednh b\u1eb1ng c\u00f4ng th\u1ee9c s = v \u00d7 t, trong \u0111\u00f3 v l\u00e0 t\u1ed1c \u0111\u1ed9 d\u00e0i. N\u1ebfu bi\u1ebft t\u1ed1c \u0111\u1ed9 g\u00f3c \u03c9 (radian\/gi\u00e2y) v\u00e0 b\u00e1n k\u00ednh qu\u1ef9 \u0111\u1ea1o R, ta c\u00f3 th\u1ec3 t\u00ednh theo c\u00f4ng th\u1ee9c s = \u03c9 \u00d7 R \u00d7 t.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"\u0110\u01a1n v\u1ecb c\u1ee7a qu\u00e3ng \u0111\u01b0\u1eddng ph\u1ee5 thu\u1ed9c v\u00e0o y\u1ebfu t\u1ed1 n\u00e0o?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"\u0110\u01a1n v\u1ecb c\u1ee7a qu\u00e3ng \u0111\u01b0\u1eddng ph\u1ee5 thu\u1ed9c tr\u1ef1c ti\u1ebfp v\u00e0o \u0111\u01a1n v\u1ecb c\u1ee7a v\u1eadn t\u1ed1c v\u00e0 th\u1eddi gian. N\u1ebfu v\u1eadn t\u1ed1c t\u00ednh b\u1eb1ng km\/h v\u00e0 th\u1eddi gian b\u1eb1ng gi\u1edd th\u00ec qu\u00e3ng \u0111\u01b0\u1eddng ra km; n\u1ebfu v\u1eadn t\u1ed1c b\u1eb1ng m\/s v\u00e0 th\u1eddi gian b\u1eb1ng gi\u00e2y th\u00ec qu\u00e3ng \u0111\u01b0\u1eddng ra m\u00e9t. \u0110\u00e2y l\u00e0 l\u00fd do b\u01b0\u1edbc \u0111\u1ed3ng b\u1ed9 \u0111\u01a1n v\u1ecb lu\u00f4n ph\u1ea3i l\u00e0m \u0111\u1ea7u ti\u00ean.\"\n      }\n    }\n  ]\n}\n<\/script><\/p>\n","protected":false},"excerpt":{"rendered":"<p>C\u00f4ng th\u1ee9c t\u00ednh qu\u00e3ng \u0111\u01b0\u1eddng \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh b\u1eb1ng t\u00edch c\u1ee7a v\u1eadn t\u1ed1c nh\u00e2n v\u1edbi th\u1eddi gian di chuy\u1ec3n c\u1ee7a v\u1eadt. K\u00fd hi\u1ec7u chu\u1ea9n c\u1ee7a \u0111\u1ea1i l\u01b0\u1ee3ng n\u00e0y l\u00e0 s, \u0111\u01b0\u1ee3c t\u00ednh b\u1eb1ng bi\u1ec3u th\u1ee9c t\u1ed5ng qu\u00e1t s = v \u00d7 t. \u0110\u00e2y l\u00e0 m\u1ea3ng ki\u1ebfn th\u1ee9c n\u1ec1n t\u1ea3ng xu\u1ea5t hi\u1ec7n xuy\u00ean su\u1ed1t trong ch\u01b0\u01a1ng [&hellip;]<\/p>\n","protected":false},"author":84,"featured_media":566782,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_focuskw":"c\u00f4ng th\u1ee9c t\u00ednh qu\u00e3ng \u0111\u01b0\u1eddng","_yoast_wpseo_title":"C\u00f4ng Th\u1ee9c T\u00ednh Qu\u00e3ng \u0110\u01b0\u1eddng: To\u00e1n L\u1edbp 5 & V\u1eadt L\u00fd L\u1edbp 8 T\u1eeb A-Z","_yoast_wpseo_metadesc":"C\u00f4ng th\u1ee9c t\u00ednh qu\u00e3ng \u0111\u01b0\u1eddng s = v \u00d7 t \u00e1p d\u1ee5ng cho To\u00e1n l\u1edbp 5 v\u00e0 V\u1eadt l\u00fd l\u1edbp 8. H\u01b0\u1edbng d\u1eabn c\u00e1ch t\u00ednh, \u0111\u1ed5i \u0111\u01a1n v\u1ecb, v\u00ed d\u1ee5 c\u00f3 l\u1eddi gi\u1ea3i v\u00e0 b\u00e0i t\u1eadp t\u1ef1 luy\u1ec7n chi ti\u1ebft.","footnotes":""},"categories":[29235,3910,30453],"tags":[],"class_list":["post-566391","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-goc-to-mo","category-kham-pha","category-kien-thuc"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.3 (Yoast SEO v27.4) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>C\u00f4ng Th\u1ee9c T\u00ednh Qu\u00e3ng \u0110\u01b0\u1eddng: To\u00e1n L\u1edbp 5 &amp; V\u1eadt L\u00fd L\u1edbp 8 T\u1eeb A-Z<\/title>\n<meta name=\"description\" content=\"C\u00f4ng th\u1ee9c t\u00ednh qu\u00e3ng \u0111\u01b0\u1eddng s = v \u00d7 t \u00e1p d\u1ee5ng cho To\u00e1n l\u1edbp 5 v\u00e0 V\u1eadt l\u00fd l\u1edbp 8. 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