{"id":283918,"date":"2023-11-17T19:27:42","date_gmt":"2023-11-17T12:27:42","guid":{"rendered":"https:\/\/hoanghamobile.com\/tin-tuc\/?p=283918"},"modified":"2026-11-05T14:12:49","modified_gmt":"2026-11-05T07:12:49","slug":"cong-thuc-tinh-thoi-gian","status":"publish","type":"post","link":"https:\/\/hoanghamobile.com\/tin-tuc\/cong-thuc-tinh-thoi-gian\/","title":{"rendered":"C\u00f4ng th\u1ee9c t\u00ednh th\u1eddi gian: t = s : v, hai xe g\u1eb7p nhau v\u00e0 b\u00e0i t\u1eadp c\u00f3 l\u1eddi gi\u1ea3i"},"content":{"rendered":"<p><strong>C\u00f4ng th\u1ee9c t\u00ednh th\u1eddi gian trong chuy\u1ec3n \u0111\u1ed9ng \u0111\u1ec1u l\u00e0 t = s : v, t\u1ee9c th\u1eddi gian b\u1eb1ng qu\u00e3ng \u0111\u01b0\u1eddng chia cho v\u1eadn t\u1ed1c.<\/strong> V\u00ed d\u1ee5 \u0111i qu\u00e3ng \u0111\u01b0\u1eddng 100 km v\u1edbi v\u1eadn t\u1ed1c 50 km\/h th\u00ec m\u1ea5t t = 100 : 50 = 2 gi\u1edd. T\u1eeb \u0111\u00f3 suy ra qu\u00e3ng \u0111\u01b0\u1eddng s = v \u00d7 t v\u00e0 v\u1eadn t\u1ed1c v = s : t. B\u00e0i vi\u1ebft t\u1ed5ng h\u1ee3p c\u00f4ng th\u1ee9c t\u00ednh th\u1eddi gian cho chuy\u1ec3n \u0111\u1ed9ng \u0111\u1ec1u, hai xe g\u1eb7p nhau, chuy\u1ec3n \u0111\u1ed9ng c\u00f3 gia t\u1ed1c, r\u01a1i t\u1ef1 do, c\u00e1ch \u0111\u1ed5i \u0111\u01a1n v\u1ecb v\u00e0 b\u00e0i t\u1eadp c\u00f3 l\u1eddi gi\u1ea3i.<\/p>\n<p><strong>T\u00f3m t\u1eaft nhanh:<\/strong><\/p>\n<ul>\n<li><strong>Chuy\u1ec3n \u0111\u1ed9ng \u0111\u1ec1u:<\/strong> t = s : v; s = v \u00d7 t; v = s : t.<\/li>\n<li><strong>Hai xe ng\u01b0\u1ee3c chi\u1ec1u g\u1eb7p nhau:<\/strong> t = s : (v\u2081 + v\u2082). <strong>C\u00f9ng chi\u1ec1u \u0111u\u1ed5i k\u1ecbp:<\/strong> t = s : (v\u2081 \u2212 v\u2082).<\/li>\n<li><strong>C\u00f3 gia t\u1ed1c:<\/strong> t = (v \u2212 v\u2080) : a. <strong>R\u01a1i t\u1ef1 do:<\/strong> t = \u221a(2h \/ g).<\/li>\n<li><strong>\u0110\u01a1n v\u1ecb:<\/strong> km v\u00e0 km\/h cho gi\u1edd; m v\u00e0 m\/s cho gi\u00e2y. 1 m\/s = 3,6 km\/h.<\/li>\n<\/ul>\n<p><img fetchpriority=\"high\" decoding=\"async\" class=\"aligncenter wp-image-285285 size-full\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/11\/cong-thuc-tinh-thoi-gian-1.jpg\" alt=\"V\u1eadn t\u1ed1c l\u00e0 g\u00ec\" width=\"800\" height=\"533\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/11\/cong-thuc-tinh-thoi-gian-1.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/11\/cong-thuc-tinh-thoi-gian-1-300x200.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/11\/cong-thuc-tinh-thoi-gian-1-768x512.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<h2>V\u1eadn t\u1ed1c l\u00e0 g\u00ec?<\/h2>\n<p>V\u1eadn t\u1ed1c l\u00e0 \u0111\u1ea1i l\u01b0\u1ee3ng cho bi\u1ebft chuy\u1ec3n \u0111\u1ed9ng nhanh hay ch\u1eadm v\u00e0 theo h\u01b0\u1edbng n\u00e0o. Trong ch\u01b0\u01a1ng tr\u00ecnh ti\u1ec3u h\u1ecdc v\u00e0 THCS, v\u1eadn t\u1ed1c (\u0111\u1ed9 l\u1edbn) \u0111\u01b0\u1ee3c t\u00ednh b\u1eb1ng qu\u00e3ng \u0111\u01b0\u1eddng \u0111i \u0111\u01b0\u1ee3c trong m\u1ed9t \u0111\u01a1n v\u1ecb th\u1eddi gian. N\u1ebfu m\u1ed9t \u00f4 t\u00f4 \u0111i 50 km m\u1ed7i gi\u1edd, ta n\u00f3i v\u1eadn t\u1ed1c c\u1ee7a \u00f4 t\u00f4 l\u00e0 50 km\/h.<\/p>\n<ul>\n<li><strong>\u0110\u01a1n v\u1ecb SI:<\/strong> m\u00e9t tr\u00ean gi\u00e2y (m\/s).<\/li>\n<li><strong>Th\u01b0\u1eddng d\u00f9ng trong \u0111\u1eddi s\u1ed1ng:<\/strong> kil\u00f4m\u00e9t tr\u00ean gi\u1edd (km\/h). 1 m\/s = 3,6 km\/h.<\/li>\n<li><strong>M\u1ed9t s\u1ed1 n\u01b0\u1edbc nh\u01b0 M\u1ef9, Anh:<\/strong> d\u1eb7m tr\u00ean gi\u1edd (mph), 1 mph = 1,609344 km\/h; foot tr\u00ean gi\u00e2y (ft\/s), 1 ft\/s = 0,3048 m\/s.<\/li>\n<\/ul>\n<p><img decoding=\"async\" class=\"aligncenter wp-image-285289 size-full\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/11\/cong-thuc-tinh-thoi-gian-2.jpg\" alt=\"\u0110\u1ed3ng h\u1ed3 t\u1ed1c \u0111\u1ed9 hi\u1ec3n th\u1ecb km\/h\" width=\"800\" height=\"533\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/11\/cong-thuc-tinh-thoi-gian-2.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/11\/cong-thuc-tinh-thoi-gian-2-300x200.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/11\/cong-thuc-tinh-thoi-gian-2-768x512.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<p>V\u1eadn t\u1ed1c kh\u00e1c t\u1ed1c \u0111\u1ed9 \u1edf ch\u1ed7: v\u1eadn t\u1ed1c l\u00e0 \u0111\u1ea1i l\u01b0\u1ee3ng c\u00f3 h\u01b0\u1edbng (vect\u01a1), c\u00f2n t\u1ed1c \u0111\u1ed9 ch\u1ec9 c\u00f3 \u0111\u1ed9 l\u1edbn. Trong c\u00e1c b\u00e0i to\u00e1n chuy\u1ec3n \u0111\u1ed9ng th\u1eb3ng m\u1ed9t chi\u1ec1u \u1edf ti\u1ec3u h\u1ecdc, hai kh\u00e1i ni\u1ec7m th\u01b0\u1eddng \u0111\u01b0\u1ee3c d\u00f9ng nh\u01b0 nhau. Chi ti\u1ebft h\u01a1n c\u00f3 trong b\u00e0i <a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/cong-thuc-tinh-van-toc\/\">c\u00f4ng th\u1ee9c t\u00ednh v\u1eadn t\u1ed1c<\/a>.<\/p>\n<p><img decoding=\"async\" class=\"aligncenter wp-image-285295 size-full\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/11\/cong-thuc-tinh-thoi-gian-3.jpg\" alt=\"Ph\u00e2n bi\u1ec7t t\u1ed1c \u0111\u1ed9 v\u00e0 v\u1eadn t\u1ed1c\" width=\"800\" height=\"533\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/11\/cong-thuc-tinh-thoi-gian-3.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/11\/cong-thuc-tinh-thoi-gian-3-300x200.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/11\/cong-thuc-tinh-thoi-gian-3-768x512.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<h2>C\u00f4ng th\u1ee9c t\u00ednh th\u1eddi gian trong chuy\u1ec3n \u0111\u1ed9ng \u0111\u1ec1u<\/h2>\n<p style=\"text-align: center;\"><strong>t = s : v<\/strong><\/p>\n<ul>\n<li>t: th\u1eddi gian (gi\u1edd, ph\u00fat, gi\u00e2y).<\/li>\n<li>s: qu\u00e3ng \u0111\u01b0\u1eddng (km, m).<\/li>\n<li>v: v\u1eadn t\u1ed1c (km\/h, m\/s).<\/li>\n<\/ul>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-285300 size-full\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/11\/cong-thuc-tinh-thoi-gian-4.jpg\" alt=\"C\u00f4ng th\u1ee9c t\u00ednh v\u1eadn t\u1ed1c v = S\/t\" width=\"800\" height=\"533\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/11\/cong-thuc-tinh-thoi-gian-4.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/11\/cong-thuc-tinh-thoi-gian-4-300x200.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/11\/cong-thuc-tinh-thoi-gian-4-768x512.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<table>\n<thead>\n<tr>\n<th>C\u1ea7n t\u00ecm<\/th>\n<th>C\u00f4ng th\u1ee9c<\/th>\n<th>V\u00ed d\u1ee5<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Th\u1eddi gian<\/td>\n<td>t = s : v<\/td>\n<td>s = 100 km, v = 50 km\/h \u2192 t = 2 gi\u1edd<\/td>\n<\/tr>\n<tr>\n<td>Qu\u00e3ng \u0111\u01b0\u1eddng<\/td>\n<td>s = v \u00d7 t<\/td>\n<td>v = 45 km\/h, t = 7 gi\u1edd \u2192 s = 315 km<\/td>\n<\/tr>\n<tr>\n<td>V\u1eadn t\u1ed1c<\/td>\n<td>v = s : t<\/td>\n<td>s = 150 km, t = 2 gi\u1edd \u2192 v = 75 km\/h<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-285323 size-full\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/11\/cong-thuc-tinh-thoi-gian-5.jpg\" alt=\"C\u00f4ng th\u1ee9c t\u00ednh th\u1eddi gian t = S\/v v\u00e0 qu\u00e3ng \u0111\u01b0\u1eddng S = v x t\" width=\"800\" height=\"533\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/11\/cong-thuc-tinh-thoi-gian-5.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/11\/cong-thuc-tinh-thoi-gian-5-300x200.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/11\/cong-thuc-tinh-thoi-gian-5-768x512.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<p>C\u00e1ch t\u00ednh qu\u00e3ng \u0111\u01b0\u1eddng \u0111\u01b0\u1ee3c tr\u00ecnh b\u00e0y ri\u00eang trong b\u00e0i <a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/cong-thuc-tinh-quang-duong\/\">c\u00f4ng th\u1ee9c t\u00ednh qu\u00e3ng \u0111\u01b0\u1eddng<\/a>.<\/p>\n<h2>C\u00e1ch \u0111\u1ed5i \u0111\u01a1n v\u1ecb th\u1eddi gian v\u00e0 v\u1eadn t\u1ed1c<\/h2>\n<table>\n<thead>\n<tr>\n<th>\u0110\u1ed5i<\/th>\n<th>C\u00e1ch l\u00e0m<\/th>\n<th>V\u00ed d\u1ee5<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Ph\u00fat \u2192 gi\u1edd<\/td>\n<td>Chia 60<\/td>\n<td>90 ph\u00fat = 1,5 gi\u1edd; 18 ph\u00fat = 0,3 gi\u1edd<\/td>\n<\/tr>\n<tr>\n<td>Gi\u1edd \u2192 ph\u00fat<\/td>\n<td>Nh\u00e2n 60<\/td>\n<td>2,5 gi\u1edd = 150 ph\u00fat<\/td>\n<\/tr>\n<tr>\n<td>m\/s \u2192 km\/h<\/td>\n<td>Nh\u00e2n 3,6<\/td>\n<td>30 m\/s = 108 km\/h<\/td>\n<\/tr>\n<tr>\n<td>km\/h \u2192 m\/s<\/td>\n<td>Chia 3,6<\/td>\n<td>72 km\/h = 20 m\/s<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>K\u1ebft qu\u1ea3 t ra s\u1ed1 th\u1eadp ph\u00e2n gi\u1edd th\u00ec \u0111\u1ed5i ph\u1ea7n l\u1ebb sang ph\u00fat: 1,2 gi\u1edd = 1 gi\u1edd 12 ph\u00fat.<\/p>\n<h2>C\u00f4ng th\u1ee9c t\u00ednh th\u1eddi gian hai chuy\u1ec3n \u0111\u1ed9ng g\u1eb7p nhau<\/h2>\n<ul>\n<li><strong>Hai xe \u0111i ng\u01b0\u1ee3c chi\u1ec1u, kh\u1edfi h\u00e0nh c\u00f9ng l\u00fac:<\/strong> th\u1eddi gian g\u1eb7p nhau t = s : (v\u2081 + v\u2082), v\u1edbi s l\u00e0 kho\u1ea3ng c\u00e1ch ban \u0111\u1ea7u. V\u00ed d\u1ee5 hai xe c\u00e1ch nhau 120 km, v\u1eadn t\u1ed1c 40 km\/h v\u00e0 60 km\/h th\u00ec g\u1eb7p nhau sau 120 : 100 = 1,2 gi\u1edd = 1 gi\u1edd 12 ph\u00fat.<\/li>\n<li><strong>Hai xe \u0111i c\u00f9ng chi\u1ec1u, xe sau \u0111u\u1ed5i xe tr\u01b0\u1edbc:<\/strong> t = s : (v\u2081 \u2212 v\u2082), v\u1edbi v\u2081 > v\u2082. V\u00ed d\u1ee5 xe sau 50 km\/h \u0111u\u1ed5i xe tr\u01b0\u1edbc 30 km\/h, c\u00e1ch nhau 60 km th\u00ec \u0111u\u1ed5i k\u1ecbp sau 60 : 20 = 3 gi\u1edd.<\/li>\n<\/ul>\n<h2>C\u00f4ng th\u1ee9c t\u00ednh th\u1eddi gian n\u00e2ng cao (V\u1eadt l\u00fd)<\/h2>\n<h3>Chuy\u1ec3n \u0111\u1ed9ng th\u1eb3ng bi\u1ebfn \u0111\u1ed5i \u0111\u1ec1u<\/h3>\n<p style=\"text-align: center;\"><strong>t = (v \u2212 v\u2080) : a<\/strong><\/p>\n<p>v\u2080 l\u00e0 v\u1eadn t\u1ed1c \u0111\u1ea7u, v l\u00e0 v\u1eadn t\u1ed1c cu\u1ed1i, a l\u00e0 gia t\u1ed1c. V\u00ed d\u1ee5 xe t\u0103ng t\u1ed1c t\u1eeb 5 m\/s l\u00ean 20 m\/s v\u1edbi gia t\u1ed1c 2,5 m\/s\u00b2 th\u00ec m\u1ea5t t = 15 : 2,5 = 6 gi\u00e2y.<\/p>\n<h3>Th\u1eddi gian r\u01a1i t\u1ef1 do<\/h3>\n<p style=\"text-align: center;\"><strong>t = \u221a(2h \/ g)<\/strong><\/p>\n<p>h l\u00e0 \u0111\u1ed9 cao (m), g l\u00e0 gia t\u1ed1c tr\u1ecdng tr\u01b0\u1eddng (\u2248 9,8 m\/s\u00b2, nhi\u1ec1u b\u00e0i l\u1ea5y 10 m\/s\u00b2). V\u00ed d\u1ee5 th\u1ea3 v\u1eadt t\u1eeb \u0111\u1ed9 cao 80 m, l\u1ea5y g = 10 m\/s\u00b2 th\u00ec t = \u221a(160 : 10) = 4 gi\u00e2y.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-285336 size-full\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/11\/cong-thuc-tinh-thoi-gian-7.jpg\" alt=\"Th\u1eddi gian di chuy\u1ec3n ph\u1ee5 thu\u1ed9c v\u00e0o v\u1eadn t\u1ed1c\" width=\"800\" height=\"533\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/11\/cong-thuc-tinh-thoi-gian-7.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/11\/cong-thuc-tinh-thoi-gian-7-300x200.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/11\/cong-thuc-tinh-thoi-gian-7-768x512.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<h2>B\u00e0i t\u1eadp t\u00ednh th\u1eddi gian, v\u1eadn t\u1ed1c, qu\u00e3ng \u0111\u01b0\u1eddng c\u00f3 l\u1eddi gi\u1ea3i<\/h2>\n<p><strong>B\u00e0i 1 (t\u00ednh v\u1eadn t\u1ed1c):<\/strong> Xe m\u00e1y \u0111i t\u1eeb A l\u00fac 8 gi\u1edd 30 ph\u00fat, \u0111\u1ebfn B l\u00fac 10 gi\u1edd 30 ph\u00fat. Qu\u00e3ng \u0111\u01b0\u1eddng AB d\u00e0i 150 km. T\u00ednh v\u1eadn t\u1ed1c xe m\u00e1y.<br \/>L\u1eddi gi\u1ea3i: th\u1eddi gian \u0111i l\u00e0 10 gi\u1edd 30 ph\u00fat \u2212 8 gi\u1edd 30 ph\u00fat = 2 gi\u1edd. V\u1eadn t\u1ed1c v = 150 : 2 = 75 km\/h.<\/p>\n<p><strong>B\u00e0i 2 (t\u00ednh th\u1eddi gian):<\/strong> Qu\u00e3ng \u0111\u01b0\u1eddng AB d\u00e0i 100 km. M\u1ed9t xe t\u1ea3i \u0111i v\u1edbi v\u1eadn t\u1ed1c 50 km\/h, d\u1ecdc \u0111\u01b0\u1eddng ngh\u1ec9 20 ph\u00fat v\u00e0 \u0111\u1ebfn B l\u00fac 11 gi\u1edd 30 ph\u00fat. H\u1ecfi xe xu\u1ea5t ph\u00e1t l\u00fac m\u1ea5y gi\u1edd?<br \/>L\u1eddi gi\u1ea3i: th\u1eddi gian l\u0103n b\u00e1nh t = 100 : 50 = 2 gi\u1edd. T\u00ednh c\u1ea3 th\u1eddi gian ngh\u1ec9 l\u00e0 2 gi\u1edd 20 ph\u00fat. Xe xu\u1ea5t ph\u00e1t l\u00fac 11 gi\u1edd 30 ph\u00fat \u2212 2 gi\u1edd 20 ph\u00fat = 9 gi\u1edd 10 ph\u00fat.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-285344 size-full\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/11\/cong-thuc-tinh-thoi-gian-8.jpg\" alt=\"B\u00e0i t\u1eadp t\u00ednh th\u1eddi gian xu\u1ea5t ph\u00e1t\" width=\"800\" height=\"533\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/11\/cong-thuc-tinh-thoi-gian-8.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/11\/cong-thuc-tinh-thoi-gian-8-300x200.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/11\/cong-thuc-tinh-thoi-gian-8-768x512.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<p><strong>B\u00e0i 3 (t\u00ednh qu\u00e3ng \u0111\u01b0\u1eddng):<\/strong> Xe t\u1ea3i \u0111i v\u1edbi v\u1eadn t\u1ed1c 45 km\/h, xu\u1ea5t ph\u00e1t l\u00fac 7 gi\u1edd 30 ph\u00fat, \u0111\u1ebfn n\u01a1i l\u00fac 15 gi\u1edd 50 ph\u00fat, d\u1ecdc \u0111\u01b0\u1eddng ngh\u1ec9 1 gi\u1edd 20 ph\u00fat. T\u00ednh qu\u00e3ng \u0111\u01b0\u1eddng.<br \/>L\u1eddi gi\u1ea3i: t\u1ed5ng th\u1eddi gian 15 gi\u1edd 50 ph\u00fat \u2212 7 gi\u1edd 30 ph\u00fat = 8 gi\u1edd 20 ph\u00fat; th\u1eddi gian l\u0103n b\u00e1nh 8 gi\u1edd 20 ph\u00fat \u2212 1 gi\u1edd 20 ph\u00fat = 7 gi\u1edd. Qu\u00e3ng \u0111\u01b0\u1eddng s = 45 \u00d7 7 = 315 km.<\/p>\n<p><strong>B\u00e0i 4 (g\u1eb7p nhau):<\/strong> Hai xe kh\u1edfi h\u00e0nh c\u00f9ng l\u00fac t\u1eeb hai \u0111\u1ea7u qu\u00e3ng \u0111\u01b0\u1eddng 120 km, \u0111i ng\u01b0\u1ee3c chi\u1ec1u v\u1edbi v\u1eadn t\u1ed1c 40 km\/h v\u00e0 60 km\/h. Sau bao l\u00e2u hai xe g\u1eb7p nhau?<br \/>L\u1eddi gi\u1ea3i: t = 120 : (40 + 60) = 1,2 gi\u1edd = 1 gi\u1edd 12 ph\u00fat.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-285327 size-full\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/11\/cong-thuc-tinh-thoi-gian-6.jpg\" alt=\"\u0110\u1ed3ng h\u1ed3 t\u1ed1c \u0111\u1ed9 \u00f4 t\u00f4\" width=\"800\" height=\"533\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/11\/cong-thuc-tinh-thoi-gian-6.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/11\/cong-thuc-tinh-thoi-gian-6-300x200.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/11\/cong-thuc-tinh-thoi-gian-6-768x512.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<h2>L\u01b0u \u00fd khi \u00e1p d\u1ee5ng c\u00f4ng th\u1ee9c t\u00ednh th\u1eddi gian<\/h2>\n<ul>\n<li><strong>\u0110\u1ed3ng nh\u1ea5t \u0111\u01a1n v\u1ecb:<\/strong> qu\u00e3ng \u0111\u01b0\u1eddng km th\u00ec v\u1eadn t\u1ed1c km\/h v\u00e0 th\u1eddi gian ra gi\u1edd; qu\u00e3ng \u0111\u01b0\u1eddng m th\u00ec v\u1eadn t\u1ed1c m\/s v\u00e0 th\u1eddi gian ra gi\u00e2y.<\/li>\n<li><strong>X\u00e1c \u0111\u1ecbnh \u0111\u00fang lo\u1ea1i chuy\u1ec3n \u0111\u1ed9ng:<\/strong> \u0111\u1ec1u, c\u00f3 gia t\u1ed1c hay r\u01a1i t\u1ef1 do.<\/li>\n<li><strong>Tr\u1eeb th\u1eddi gian ngh\u1ec9:<\/strong> c\u00f4ng th\u1ee9c t = s : v ch\u1ec9 cho th\u1eddi gian xe th\u1ef1c s\u1ef1 di chuy\u1ec3n.<\/li>\n<li><strong>Ki\u1ec3m tra t\u00ednh h\u1ee3p l\u00fd:<\/strong> xe m\u00e1y \u0111i 100 km m\u1ea5t 10 ph\u00fat l\u00e0 k\u1ebft qu\u1ea3 v\u00f4 l\u00fd, c\u1ea7n xem l\u1ea1i.<\/li>\n<\/ul>\n<h2>C\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p<\/h2>\n<h3>C\u00f4ng th\u1ee9c t\u00ednh th\u1eddi gian l\u00e0 g\u00ec?<\/h3>\n<p>Trong chuy\u1ec3n \u0111\u1ed9ng \u0111\u1ec1u, th\u1eddi gian b\u1eb1ng qu\u00e3ng \u0111\u01b0\u1eddng chia cho v\u1eadn t\u1ed1c: t = s : v.<\/p>\n<h3>Mu\u1ed1n t\u00ednh th\u1eddi gian ta l\u00e0m th\u1ebf n\u00e0o?<\/h3>\n<p>\u0110\u1ed5i qu\u00e3ng \u0111\u01b0\u1eddng v\u00e0 v\u1eadn t\u1ed1c v\u1ec1 c\u00f9ng h\u1ec7 \u0111\u01a1n v\u1ecb, r\u1ed3i l\u1ea5y qu\u00e3ng \u0111\u01b0\u1eddng chia cho v\u1eadn t\u1ed1c; n\u1ebfu c\u00f3 th\u1eddi gian ngh\u1ec9 th\u00ec c\u1ed9ng th\u00eam khi t\u00ednh gi\u1edd \u0111\u1ebfn ho\u1eb7c gi\u1edd \u0111i.<\/p>\n<h3>C\u00f4ng th\u1ee9c t\u00ednh th\u1eddi gian hai xe g\u1eb7p nhau l\u00e0 g\u00ec?<\/h3>\n<p>Ng\u01b0\u1ee3c chi\u1ec1u: t = s : (v\u2081 + v\u2082). C\u00f9ng chi\u1ec1u \u0111u\u1ed5i k\u1ecbp: t = s : (v\u2081 \u2212 v\u2082), v\u1edbi s l\u00e0 kho\u1ea3ng c\u00e1ch ban \u0111\u1ea7u.<\/p>\n<h3>\u0110\u1ed5i ph\u00fat sang gi\u1edd th\u1ebf n\u00e0o?<\/h3>\n<p>L\u1ea5y s\u1ed1 ph\u00fat chia 60, v\u00ed d\u1ee5 90 ph\u00fat = 1,5 gi\u1edd, 18 ph\u00fat = 0,3 gi\u1edd.<\/p>\n<h3>C\u00f4ng th\u1ee9c t\u00ednh th\u1eddi gian r\u01a1i t\u1ef1 do l\u00e0 g\u00ec?<\/h3>\n<p>t = \u221a(2h \/ g), v\u1edbi h l\u00e0 \u0111\u1ed9 cao v\u00e0 g l\u00e0 gia t\u1ed1c tr\u1ecdng tr\u01b0\u1eddng, th\u01b0\u1eddng l\u1ea5y 9,8 m\/s\u00b2 ho\u1eb7c 10 m\/s\u00b2.<\/p>\n<h3>C\u00f4ng th\u1ee9c t\u00ednh th\u1eddi gian h\u1ecdc \u1edf l\u1edbp m\u1ea5y?<\/h3>\n<p>C\u00f4ng th\u1ee9c t = s : v \u0111\u01b0\u1ee3c h\u1ecdc \u1edf To\u00e1n l\u1edbp 5; c\u00e1c c\u00f4ng th\u1ee9c c\u00f3 gia t\u1ed1c v\u00e0 r\u01a1i t\u1ef1 do h\u1ecdc \u1edf V\u1eadt l\u00fd l\u1edbp 10.<\/p>\n<p><script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"C\u00f4ng th\u1ee9c t\u00ednh th\u1eddi gian l\u00e0 g\u00ec?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Trong chuy\u1ec3n \u0111\u1ed9ng \u0111\u1ec1u, th\u1eddi gian b\u1eb1ng qu\u00e3ng \u0111\u01b0\u1eddng chia cho v\u1eadn t\u1ed1c: t = s : v.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Mu\u1ed1n t\u00ednh th\u1eddi gian ta l\u00e0m th\u1ebf n\u00e0o?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"\u0110\u1ed5i qu\u00e3ng \u0111\u01b0\u1eddng v\u00e0 v\u1eadn t\u1ed1c v\u1ec1 c\u00f9ng h\u1ec7 \u0111\u01a1n v\u1ecb, r\u1ed3i l\u1ea5y qu\u00e3ng \u0111\u01b0\u1eddng chia cho v\u1eadn t\u1ed1c; n\u1ebfu c\u00f3 th\u1eddi gian ngh\u1ec9 th\u00ec c\u1ed9ng th\u00eam khi t\u00ednh gi\u1edd \u0111\u1ebfn ho\u1eb7c gi\u1edd \u0111i.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"C\u00f4ng th\u1ee9c t\u00ednh th\u1eddi gian hai xe g\u1eb7p nhau l\u00e0 g\u00ec?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Ng\u01b0\u1ee3c chi\u1ec1u: t = s : (v\u2081 + v\u2082). C\u00f9ng chi\u1ec1u \u0111u\u1ed5i k\u1ecbp: t = s : (v\u2081 \u2212 v\u2082), v\u1edbi s l\u00e0 kho\u1ea3ng c\u00e1ch ban \u0111\u1ea7u.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"\u0110\u1ed5i ph\u00fat sang gi\u1edd th\u1ebf n\u00e0o?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"L\u1ea5y s\u1ed1 ph\u00fat chia 60, v\u00ed d\u1ee5 90 ph\u00fat = 1,5 gi\u1edd, 18 ph\u00fat = 0,3 gi\u1edd.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"C\u00f4ng th\u1ee9c t\u00ednh th\u1eddi gian r\u01a1i t\u1ef1 do l\u00e0 g\u00ec?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"t = \u221a(2h \/ g), v\u1edbi h l\u00e0 \u0111\u1ed9 cao v\u00e0 g l\u00e0 gia t\u1ed1c tr\u1ecdng tr\u01b0\u1eddng, th\u01b0\u1eddng l\u1ea5y 9,8 m\/s\u00b2 ho\u1eb7c 10 m\/s\u00b2.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"C\u00f4ng th\u1ee9c t\u00ednh th\u1eddi gian h\u1ecdc \u1edf l\u1edbp m\u1ea5y?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"C\u00f4ng th\u1ee9c t = s : v \u0111\u01b0\u1ee3c h\u1ecdc \u1edf To\u00e1n l\u1edbp 5; c\u00e1c c\u00f4ng th\u1ee9c c\u00f3 gia t\u1ed1c v\u00e0 r\u01a1i t\u1ef1 do h\u1ecdc \u1edf V\u1eadt l\u00fd l\u1edbp 10.\"\n      }\n    }\n  ]\n}\n<\/script><\/p>\n<h2>K\u1ebft lu\u1eadn<\/h2>\n<p>Th\u1eddi gian trong chuy\u1ec3n \u0111\u1ed9ng \u0111\u1ec1u \u0111\u01b0\u1ee3c t\u00ednh b\u1eb1ng t = s : v; v\u1edbi hai xe g\u1eb7p nhau th\u00ec chia cho t\u1ed5ng ho\u1eb7c hi\u1ec7u v\u1eadn t\u1ed1c, c\u00f2n chuy\u1ec3n \u0111\u1ed9ng c\u00f3 gia t\u1ed1c v\u00e0 r\u01a1i t\u1ef1 do c\u00f3 c\u00f4ng th\u1ee9c ri\u00eang. \u0110\u1ed5i \u0111\u01a1n v\u1ecb tr\u01b0\u1edbc khi t\u00ednh v\u00e0 nh\u1edb tr\u1eeb th\u1eddi gian ngh\u1ec9 l\u00e0 tr\u00e1nh \u0111\u01b0\u1ee3c h\u1ea7u h\u1ebft l\u1ed7i sai trong b\u00e0i to\u00e1n chuy\u1ec3n \u0111\u1ed9ng.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>C\u00f4ng th\u1ee9c t\u00ednh th\u1eddi gian trong chuy\u1ec3n \u0111\u1ed9ng \u0111\u1ec1u l\u00e0 t = s : v, t\u1ee9c th\u1eddi gian b\u1eb1ng qu\u00e3ng \u0111\u01b0\u1eddng chia cho v\u1eadn t\u1ed1c. V\u00ed d\u1ee5 \u0111i qu\u00e3ng \u0111\u01b0\u1eddng 100 km v\u1edbi v\u1eadn t\u1ed1c 50 km\/h th\u00ec m\u1ea5t t = 100 : 50 = 2 gi\u1edd. T\u1eeb \u0111\u00f3 suy ra qu\u00e3ng \u0111\u01b0\u1eddng s = [&hellip;]<\/p>\n","protected":false},"author":70,"featured_media":285385,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_focuskw":"c\u00f4ng th\u1ee9c t\u00ednh th\u1eddi gian","_yoast_wpseo_title":"C\u00f4ng Th\u1ee9c T\u00ednh Th\u1eddi Gian, V\u1eadn T\u1ed1c, Qu\u00e3ng \u0110\u01b0\u1eddng V\u00e0 B\u00e0i T\u1eadp","_yoast_wpseo_metadesc":"C\u00f4ng th\u1ee9c t\u00ednh th\u1eddi gian t = s : v, c\u00e1ch t\u00ednh th\u1eddi gian hai xe g\u1eb7p nhau, chuy\u1ec3n \u0111\u1ed9ng c\u00f3 gia t\u1ed1c, r\u01a1i t\u1ef1 do, \u0111\u1ed5i \u0111\u01a1n v\u1ecb v\u00e0 b\u00e0i t\u1eadp c\u00f3 l\u1eddi gi\u1ea3i chi ti\u1ebft.","footnotes":""},"categories":[29235,3910],"tags":[],"class_list":["post-283918","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-goc-to-mo","category-kham-pha"],"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 Th\u1eddi Gian, V\u1eadn T\u1ed1c, Qu\u00e3ng \u0110\u01b0\u1eddng V\u00e0 B\u00e0i T\u1eadp<\/title>\n<meta name=\"description\" content=\"C\u00f4ng th\u1ee9c t\u00ednh th\u1eddi gian t = s : v, c\u00e1ch t\u00ednh th\u1eddi gian hai xe g\u1eb7p nhau, chuy\u1ec3n \u0111\u1ed9ng c\u00f3 gia t\u1ed1c, r\u01a1i t\u1ef1 do, \u0111\u1ed5i \u0111\u01a1n v\u1ecb v\u00e0 b\u00e0i t\u1eadp c\u00f3 l\u1eddi gi\u1ea3i chi ti\u1ebft.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/hoanghamobile.com\/tin-tuc\/cong-thuc-tinh-thoi-gian\/\" \/>\n<meta property=\"og:locale\" content=\"vi_VN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"C\u00f4ng th\u1ee9c t\u00ednh th\u1eddi gian: t = s : v, hai xe g\u1eb7p nhau v\u00e0 b\u00e0i t\u1eadp c\u00f3 l\u1eddi gi\u1ea3i\" \/>\n<meta property=\"og:description\" content=\"C\u00f4ng th\u1ee9c t\u00ednh th\u1eddi gian t = s : v, c\u00e1ch t\u00ednh th\u1eddi gian hai xe g\u1eb7p nhau, chuy\u1ec3n \u0111\u1ed9ng c\u00f3 gia t\u1ed1c, r\u01a1i t\u1ef1 do, \u0111\u1ed5i \u0111\u01a1n v\u1ecb v\u00e0 b\u00e0i t\u1eadp c\u00f3 l\u1eddi gi\u1ea3i chi ti\u1ebft.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/hoanghamobile.com\/tin-tuc\/cong-thuc-tinh-thoi-gian\/\" \/>\n<meta property=\"og:site_name\" content=\"Tin t\u1ee9c c\u00f4ng ngh\u1ec7 - HoangHaMobile\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/hoanghamobilecom\" \/>\n<meta property=\"article:published_time\" content=\"2023-11-17T12:27:42+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-11-05T07:12:49+00:00\" \/>\n<meta property=\"og:image\" 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