{"id":1131,"date":"2021-10-08T13:18:52","date_gmt":"2021-10-08T13:18:52","guid":{"rendered":"https:\/\/www.vietlearn.org\/post\/?p=1131"},"modified":"2021-10-14T22:12:09","modified_gmt":"2021-10-14T15:12:09","slug":"vat-ly-6-bang-don-vi-do-do-dai-cac-em-can-biet","status":"publish","type":"post","link":"https:\/\/www.vietlearn.org\/kien-thuc\/vat-ly-6-bang-don-vi-do-do-dai-cac-em-can-biet\/","title":{"rendered":"V\u1eadt l\u00fd 6: B\u1ea3ng \u0111\u01a1n v\u1ecb \u0111o \u0111\u1ed9 d\u00e0i c\u00e1c em c\u1ea7n bi\u1ebft?"},"content":{"rendered":"\n<script type=\"text\/javascript\">\nimg_numb = 10;\n<\/script>\n\n\n\n<p>Ghi ch\u00fa: T\u00e0i li\u1ec7u tr\u00edch d\u1eabn<\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe title=\"\u0110o \u0111\u1ed9 d\u00e0i ( P.1 ) | V\u1eadt l\u00ed 6 | DT STUDY\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/CH2yB7ZoKbk?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n\n\n\n<p>Nh\u01b0 ch\u00fang ta \u0111\u00e3 bi\u1ebft \u0111o \u0111\u1ed9 d\u00e0i l\u00e0 c\u00e1ch \u0111o ch\u00ednh x\u00e1c chi\u1ec1u d\u00e0i, chi\u1ec1u r\u1ed9ng, k\u00edch th\u01b0\u1edbc c\u1ee7a m\u1ed9t v\u1eadt. Trong cu\u1ed9c s\u1ed1ng h\u00e0ng ng\u00e0y, vi\u1ec7c \u0111o \u0111\u1ed9 d\u00e0i \u0111\u01b0\u1ee3c \u1ee9ng d\u1ee5ng r\u1ea5t nhi\u1ec1u. Ch\u00ednh v\u00ec v\u1eady, \u0111o \u0111\u1ed9 d\u00e0i \u0111\u00e3 tr\u1edf th\u00e0nh m\u1ed9t b\u00e0i h\u1ecdc kh\u00f4ng th\u1ec3 thi\u1ebfu trong ch\u01b0\u01a1ng tr\u00ecnh v\u1eadt l\u00fd 6. \u1ede c\u00e1c l\u1edbp d\u01b0\u1edbi, c\u00e1c em \u0111\u00e3 \u0111\u01b0\u1ee3c ti\u1ebfp x\u00fac v\u1edbi c\u00e1c \u0111\u01a1n v\u1ecb \u0111o \u0111\u1ed9 d\u00e0i c\u01a1 b\u1ea3n. V\u1eadt l\u00fd 6 \u0111em \u0111\u1ebfn cho c\u00e1c em b\u1ea3ng \u0111\u01a1n v\u1ecb \u0111o \u0111\u1ed9 d\u00e0i chi ti\u1ebft h\u01a1n. C\u00e1c em h\u00e3y tham kh\u1ea3o nh\u1eefng ki\u1ebfn th\u1ee9c \u0111\u01b0\u1ee3c t\u1ed5ng h\u1ee3p trong b\u00e0i vi\u1ebft n\u00e0y \u0111\u1ec3 c\u00f3 th\u1ec3 h\u1ecdc t\u1ed1t h\u01a1n nh\u00e9!<\/p>\n\n\n\n<p>\u0110o \u0111\u1ed9 d\u00e0i l\u00e0 g\u00ec?<\/p>\n\n\n\n<p>\u0110o \u0111\u1ed9 d\u00e0i l\u00e0 so s\u00e1nh \u0111\u1ed9 d\u00e0i \u0111\u00f3 v\u1edbi m\u1ed9t \u0111\u1ed9 d\u00e0i kh\u00e1c \u0111\u01b0\u1ee3c ch\u1ecdn l\u00e0m \u0111\u01a1n v\u1ecb.<\/p>\n\n\n\n<p>S\u1eed d\u1ee5ng th\u01b0\u1edbc d\u00e2y \u0111\u1ec3 \u0111o<\/p>\n\n\n\n<p>\u0110\u00e2y ch\u00ednh l\u00e0 \u0111\u1ecbnh ngh\u0129a d\u1ec5 hi\u1ec3u nh\u1ea5t d\u00e0nh cho c\u00e1c em <a href=\"https:\/\/www.vietlearn.org\" data-internallinksmanager029f6b8e52c=\"2\" title=\"Vietlearn\" rel=\"nofollow\">h\u1ecdc sinh<\/a> t\u00ecm hi\u1ec3u v\u1ec1 c\u00e1ch \u0111o \u0111\u1ed9 d\u00e0i, \u0111o \u0111\u1ed9 d\u00e0i l\u00e0 g\u00ec? Khi ch\u00fang ta x\u00e1c \u0111\u1ecbnh k\u00edch th\u01b0\u1edbc \u0111\u1ed9 d\u00e0i c\u1ee7a m\u1ed9t v\u1eadt, ch\u00fang ta kh\u00f4ng th\u1ec3 \u01b0\u1edbc l\u01b0\u1ee3ng b\u1eb1ng m\u1eaft th\u01b0\u1eddng. \u0110\u1eb7c bi\u1ec7t l\u00e0 khi ch\u00fang ta c\u1ea7n x\u00e1c \u0111\u1ecbnh k\u00edch th\u01b0\u1edbc ch\u00ednh x\u00e1c, th\u00ec c\u1ea7n ph\u1ea3i d\u00f9ng \u0111\u1ebfn th\u01b0\u1edbc \u0111o. \u1ede \u0111\u00e2y, v\u1eadt \u0111\u01b0\u1ee3c \u0111o \u0111\u1ed9 d\u00e0i s\u1ebd \u0111\u01b0\u1ee3c so s\u00e1nh v\u1edbi th\u01b0\u1edbc ch\u00ednh l\u00e0 \u2013 \u0111\u1ed9 d\u00e0i kh\u00e1c \u0111\u01b0\u1ee3c ch\u1ecdn l\u00e0m \u0111\u01a1n v\u1ecb. Th\u01b0\u1edbc \u0111o hi\u1ec7n nay c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c chia th\u00e0nh nhi\u1ec1u lo\u1ea1i \u0111\u01a1n v\u1ecb \u0111o kh\u00e1c nhau, h\u00ecnh d\u1ea1ng kh\u00e1c nhau. B\u1ea3ng \u0111\u01a1n v\u1ecb \u0111o \u0111\u1ed9 d\u00e0i s\u1ebd gi\u00fap ch\u00fang ta ch\u1ecdn \u0111\u01b0\u1ee3c th\u01b0\u1edbc \u0111o c\u00f3 \u0111\u01a1n v\u1ecb \u0111o th\u00edch h\u1ee3p.<\/p>\n\n\n\n<p>Gi\u1edbi h\u1ea1n \u0111o l\u00e0 l\u00e0 \u0111\u1ed9 d\u00e0i l\u1edbn nh\u1ea5t ghi tr\u00ean th\u01b0\u1edbc.<\/p>\n\n\n\n<p>M\u1ecdi chi\u1ebfc th\u01b0\u1edbc \u0111\u1ec1u c\u00f3 gi\u1edbi h\u1ea1n x\u00e1c \u0111\u1ecbnh. Ch\u00ednh v\u00ec v\u1eady, ng\u01b0\u1eddi ta th\u01b0\u1eddng d\u00f9ng th\u01b0\u1edbc d\u00e2y, th\u01b0\u1edbc cu\u1ed9n \u0111\u1ec3 \u0111o \u0111\u1ed9 d\u00e0i nh\u1eefng v\u1eadt l\u1edbn. C\u00e1c em n\u00ean ch\u00fa \u00fd \u0111\u1ebfn gi\u1edbi h\u1ea1n \u0111o \u0111\u1ed9 d\u00e0i c\u1ee7a th\u01b0\u1edbc \u0111\u1ec3 \u0111o v\u1eadt ch\u00ednh x\u00e1c nh\u1ea5t. C\u00f3 nhi\u1ec1u c\u00e1ch \u0111o \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh k\u00edch th\u01b0\u1edbc m\u1ed9t v\u1eadt. N\u1ebfu v\u1eadt v\u01b0\u1ee3t qu\u00e1 gi\u1edbi h\u1ea1n c\u1ee7a gi\u1edbi h\u1ea1n \u0111o. C\u00e1c em ho\u00e0n to\u00e0n c\u00f3 th\u1ec3 \u0111o nhi\u1ec1u l\u1ea7n n\u1ed1i ti\u1ebfp nhau. Sau \u0111\u00f3 c\u1ed9ng t\u1ed5ng \u0111\u1ed9 d\u00e0i \u0111\u1ec3 ra k\u00edch th\u01b0\u1edbc c\u1ee7a v\u1eadt c\u1ea7n x\u00e1c \u0111\u1ecbnh. Th\u01b0\u1edbc s\u1ebd c\u00f3 s\u1eb5n nh\u1eefng \u0111\u01a1n v\u1ecb \u0111o \u0111\u1ed9 d\u00e0i trong b\u1ea3ng \u0111\u01a1n v\u1ecb \u0111o \u0111\u1ed9 d\u00e0i \u0111\u1ec3 quy \u0111\u1ed5i.<\/p>\n\n\n\n<p>\u0110\u1ed9 chia nh\u1ecf nh\u1ea5t l\u00e0 \u0111\u1ed9 d\u00e0i gi\u1eefa hai v\u1ea1ch chia li\u00ean ti\u1ebfp tr\u00ean th\u01b0\u1edbc.<\/p>\n\n\n\n<p>\u0110\u1ed1i v\u1edbi c\u00e1c lo\u1ea1i th\u01b0\u1edbc kh\u00e1c nhau s\u1eed d\u1ee5ng trong cu\u1ed9c s\u1ed1ng h\u00e0ng ng\u00e0y, \u0111\u1ed9 chi nh\u1ecf nh\u1ea5t c\u00f3 th\u1ec3 s\u1ebd d\u00e0i ng\u1eafn kh\u00e1c nhau. Tr\u00ean th\u01b0\u1edbc k\u1ebb th\u00f4ng th\u01b0\u1eddng c\u1ee7a <a href=\"https:\/\/www.vietlearn.org\" data-internallinksmanager029f6b8e52c=\"2\" title=\"Vietlearn\" rel=\"nofollow\">h\u1ecdc sinh<\/a>, \u0111\u1ed9 chia nh\u1ecf nh\u1ea5t th\u01b0\u1eddng l\u00e0 1mm. C\u00e1c em n\u00ean ki\u1ec3m tra \u0111\u1ed9 chia nh\u1ecf nh\u1ea5t tr\u01b0\u1edbc khi s\u1eed d\u1ee5ng \u0111\u1ec3 c\u00f3 th\u1ec3 \u0111\u1ea3m b\u1ea3o k\u1ebft qu\u1ea3 \u0111o ch\u00ednh x\u00e1c. B\u1ea3ng \u0111\u01a1n v\u1ecb \u0111o \u0111\u1ed9 d\u00e0i s\u1ebd gi\u00fap c\u00e1c em x\u00e1c \u0111\u1ecbnh \u0111\u01b0\u1ee3c \u0111\u1ed9 d\u00e0i c\u1ee7a c\u00e1c v\u1ea1ch chia tr\u00ean th\u01b0\u1edbc. Thu\u1ed9c b\u1ea3ng \u0111\u01a1n v\u1ecb n\u00e0y c\u00e1c em s\u1ebd d\u1ec5 d\u00e0ng <a href=\"https:\/\/www.vietlearn.org\" data-internallinksmanager029f6b8e52c=\"2\" title=\"Vietlearn\" rel=\"nofollow\">h\u1ecdc t\u1eadp<\/a>, \u1ee9ng d\u1ee5ng th\u1ef1c t\u1ebf nhi\u1ec1u h\u01a1n.<\/p>\n\n\n\n<p>Th\u01b0\u1edbc d\u00e2y \u2013 b\u1ea3ng \u0111\u01a1n v\u1ecb \u0111o \u0111\u1ed9 d\u00e0i<\/p>\n\n\n\n<p>B\u1ea3ng \u0111\u01a1n v\u1ecb \u0111o \u0111\u1ed9 d\u00e0i<\/p>\n\n\n\n<p>\u0110\u01a1n v\u1ecb \u0111o \u0111\u1ed9 d\u00e0i trong h\u1ec7 th\u1ed1ng \u0111\u01a1n v\u1ecb \u0111o l\u01b0\u1eddng h\u1ee3p ph\u00e1p c\u1ee7a Vi\u1ec7t Nam l\u00e0 m\u00e9t. Th\u01b0\u1eddng \u0111\u01b0\u1ee3c k\u00fd hi\u1ec7u l\u00e0 m.<\/p>\n\n\n\n<p>V\u1edbi \u0111\u01a1n v\u1ecb \u0111o \u0111\u1ed9 d\u00e0i n\u00e0y, c\u00e1c em s\u1ebd th\u01b0\u1eddng th\u1ea5y trong vi\u1ec7c \u0111o chi\u1ec1u cao c\u1ee7a con ng\u01b0\u1eddi. \u0110o nh\u1eefng \u0111\u1ed3 v\u1eadt c\u00f3 k\u00edch th\u01b0\u1edbc l\u1edbn, ng\u01b0\u1eddi ta c\u0169ng s\u1ebd s\u1eed d\u1ee5ng \u0111\u01a1n v\u1ecb \u0111o n\u00e0y. 1m = 100cm. \u0110\u00e2y ch\u00ednh l\u00e0 c\u00e1ch quy \u0111\u1ed5i v\u1ec1 centimet tr\u00ean th\u01b0\u1edbc \u0111o c\u1ee7a <a href=\"https:\/\/www.vietlearn.org\" data-internallinksmanager029f6b8e52c=\"2\" title=\"Vietlearn\" rel=\"nofollow\">h\u1ecdc sinh<\/a>.<\/p>\n\n\n\n<p>\u0110\u01a1n v\u1ecb \u0111o \u0111\u1ed9 d\u00e0i l\u1edbn h\u01a1n m\u00e9t l\u00e0 kilomet. Th\u01b0\u1eddng \u0111\u01b0\u1ee3c k\u00fd hi\u1ec7u l\u00e0 Km.<\/p>\n\n\n\n<p>\u0110\u01a1n v\u1ecb \u0111o \u0111\u1ed9 d\u00e0i Kilomet th\u01b0\u1eddng \u0111\u01b0\u1ee3c \u1ee9ng d\u1ee5ng trong vi\u1ec7c \u0111o \u0111\u1ed9 d\u00e0i qu\u00e3ng \u0111\u01b0\u1eddng, chi\u1ec1u cao t\u00f2a nh\u00e0,\u2026 \u0110\u00e2y l\u00e0 m\u1ed9t \u0111\u01a1n v\u1ecb l\u1edbn, c\u00e1c em n\u00ean ch\u00fa \u00fd trong c\u00e1ch \u0111\u1ed5i \u0111\u01a1n v\u1ecb v\u00e0 v\u1eadn d\u1ee5ng th\u1ef1c t\u1ebf. Nh\u1eefng b\u00e0i v\u1eadt l\u00fd l\u1edbp 6, ho\u1eb7c nh\u1eefng b\u00e0i to\u00e1n t\u00ednh kho\u1ea3ng c\u00e1ch th\u01b0\u1eddng s\u1ebd xu\u1ea5t hi\u1ec7n \u0111\u01a1n v\u1ecb \u0111o \u0111\u1ed9 d\u00e0i n\u00e0y. 1km = 100m.<\/p>\n\n\n\n<p>\u0110\u01a1n v\u1ecb \u0111o \u0111\u1ed9 d\u00e0i nh\u1ecf h\u01a1n m\u00e9t l\u00e0 decimet (dm), centimet (cm) v\u00e0 milimet (mm).<\/p>\n\n\n\n<p>B\u1ea3ng \u0111\u01a1n v\u1ecb \u0111o \u0111\u1ed9 d\u00e0i<\/p>\n\n\n\n<p>V\u1edbi nh\u1eefng \u0111\u01a1n v\u1ecb nh\u1ecf h\u01a1n n\u00e0y, c\u00e1c em s\u1ebd \u0111\u01b0\u1ee3c v\u1eadn d\u1ee5ng trong c\u00e1c b\u00e0i to\u00e1n, v\u1eadt l\u00fd \u0111o \u0111\u1ed9 d\u00e0i \u0111o\u1ea1n th\u1eb3ng. Ho\u1eb7c x\u00e1c \u0111\u1ecbnh k\u00edch th\u01b0\u1edbc c\u1ee7a c\u00e1c v\u1eadt nh\u1ecf. Tr\u00ean th\u01b0\u1edbc k\u1ebb th\u00f4ng th\u01b0\u1eddng c\u1ee7a <a href=\"https:\/\/www.vietlearn.org\" data-internallinksmanager029f6b8e52c=\"2\" title=\"Vietlearn\" rel=\"nofollow\">h\u1ecdc sinh<\/a>, ng\u01b0\u1eddi ta s\u1eed d\u1ee5ng \u0111\u01a1n v\u1ecb \u0111o cm v\u00e0 mm.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img fetchpriority=\"high\" decoding=\"async\" width=\"650\" height=\"381\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/10\/Bang_don_vi_do_do_dai-650x381-1.jpg\" alt=\"B\u1ea3ng \u0111\u01a1n v\u1ecb \u0111o \u0111\u1ed9 d\u00e0i\" class=\"wp-image-2318\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/10\/Bang_don_vi_do_do_dai-650x381-1.jpg 650w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/10\/Bang_don_vi_do_do_dai-650x381-1-300x176.jpg 300w\" sizes=\"(max-width: 650px) 100vw, 650px\" \/><figcaption>B\u1ea3ng \u0111\u01a1n v\u1ecb \u0111o \u0111\u1ed9 d\u00e0i <\/figcaption><\/figure>\n\n\n\n<p>M\u1ed9t s\u1ed1 chuy\u1ec3n \u0111\u1ed5i \u0111\u01a1n v\u1ecb \u0111o \u0111\u1ed9 d\u00e0i c\u01a1 b\u1ea3n th\u01b0\u1eddng d\u00f9ng:<\/p>\n\n\n\n<p>1km = 1000m<\/p>\n\n\n\n<p>1m = 10dm<\/p>\n\n\n\n<p>1m = 100cm<\/p>\n\n\n\n<p>1m = 1000mm<\/p>\n\n\n\n<p>B\u1ea3ng \u0111\u01a1n v\u1ecb \u0111o \u0111\u1ed9 d\u00e0i s\u1ebd ch\u1ec9 d\u1eabn c\u00e1c em c\u00e1ch chuy\u1ec3n \u0111\u1ed5i gi\u1eefa nh\u1eefng \u0111\u01a1n v\u1ecb \u0111o. Nh\u1edb \u0111\u01b0\u1ee3c t\u1ec9 l\u1ec7 chuy\u1ec3n \u0111\u1ed5i, c\u00e1c em c\u00f3 th\u1ec3 \u00e1p d\u1ee5ng t\u1ed1t h\u01a1n trong vi\u1ec7c gi\u1ea3i c\u00e1c b\u00e0i v\u1eadt l\u00fd, b\u00e0i to\u00e1n tr\u00ean l\u1edbp. \u0110\u00e2y c\u0169ng l\u00e0 m\u1ed9t ki\u1ebfn th\u1ee9c c\u00f3 th\u1ec3 \u00e1p d\u1ee5ng v\u00e0o th\u1ef1c t\u1ebf, v\u00ec v\u1eady, c\u00e1c em n\u00ean h\u1ecdc thu\u1ed9c b\u1ea3ng chuy\u1ec3n \u0111\u1ed5i n\u00e0y.<\/p>\n\n\n\n<p>D\u1ee5ng c\u1ee5 \u0111\u1ec3 \u0111o \u0111\u1ed9 d\u00e0i<\/p>\n\n\n\n<p>Trong cu\u1ed9c s\u1ed1ng, ch\u1eafc h\u1eb3n c\u00e1c em \u0111\u00e3 b\u1eaft g\u1eb7p r\u1ea5t nhi\u1ec1u c\u00e1c lo\u1ea1i th\u01b0\u1edbc d\u00f9ng \u0111\u1ec3 \u0111o \u0111\u1ed9 d\u00e0i. Th\u01b0\u1edbc \u0111o ch\u00ednh l\u00e0 d\u1ee5ng c\u1ee5 \u0111\u1ec3 \u0111o \u0111\u1ed9 d\u00e0i th\u00f4ng d\u1ee5ng nh\u1ea5t hi\u1ec7n nay. Th\u01b0\u1edbc c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c l\u00e0m t\u1eeb nhi\u1ec1u ch\u1ea5t li\u1ec7u. T\u1eebng lo\u1ea1i th\u01b0\u1edbc kh\u00e1c nhau c\u00f3 th\u1ec3 d\u00f9ng trong c\u00e1c tr\u01b0\u1eddng h\u1ee3p \u0111o v\u1eadt kh\u00e1c nhau. Th\u01b0\u1edbc cu\u1ed9n th\u01b0\u1eddng d\u00f9ng \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh nh\u1eefng v\u1eadt ho\u1eb7c kho\u1ea3ng c\u00e1ch l\u1edbn. Th\u01b0\u1edbc d\u00e2y th\u01b0\u1eddng d\u00f9ng \u0111\u1ec3 \u0111o chi\u1ec1u cao, \u0111o k\u00edch th\u01b0\u1edbc c\u01a1 th\u1ec3 con ng\u01b0\u1eddi. Th\u01b0\u1edbc c\u1ee9ng nh\u01b0 th\u01b0\u1edbc nh\u1ef1a th\u01b0\u1edbc g\u1ed7 \u0111\u01b0\u1ee3c d\u00f9ng \u0111\u1ec3 \u0111o k\u00edch th\u01b0\u1edbc c\u1ee7a v\u1eadt nh\u1ecf. Th\u01b0\u1edbc k\u1eb9p c\u0169ng l\u00e0 m\u1ed9t d\u1ea1ng th\u01b0\u1edbc \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng nhi\u1ec1u trong cu\u1ed9c s\u1ed1ng.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img decoding=\"async\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/10\/hinh-bai-c7-trang-10-sgk-vly-6.jpg\" alt=\"\" class=\"wp-image-2319\" width=\"431\" height=\"282\"\/><\/figure>\n\n\n\n<p>Th\u01b0\u1edbc \u0111o \u0111\u1ed9 d\u00e0i \u2013 b\u1ea3ng \u0111\u01a1n v\u1ecb \u0111o \u0111\u1ed9 d\u00e0i<\/p>\n\n\n\n<p>\u0110\u1ec3 c\u00f3 th\u1ec3 <a href=\"https:\/\/www.vietlearn.org\" data-internallinksmanager029f6b8e52c=\"2\" title=\"Vietlearn\" rel=\"nofollow\">thi\u1ebft k\u1ebf<\/a> ra chi\u1ebfc th\u01b0\u1edbc mang s\u1ed1 \u0111o chu\u1ea9n ch\u1ec9nh ng\u01b0\u1eddi ta ph\u1ea3i d\u00f9ng b\u1ea3ng \u0111\u01a1n v\u1ecb \u0111o \u0111\u1ed9 d\u00e0i. M\u1ecdi chi\u1ebfc th\u01b0\u1edbc \u0111\u01b0\u1ee3c b\u00e1n ra tr\u00ean th\u1ecb tr\u01b0\u1eddng \u0111\u1ec1u \u0111\u01b0\u1ee3c ki\u1ec3m tra k\u1ef9 v\u1ec1 \u0111\u1ed9 d\u00e0i. Ch\u00fang ta ho\u00e0n to\u00e0n c\u00f3 th\u1ec3 tin t\u01b0\u1edfng v\u00e0 s\u1eed d\u1ee5ng h\u1eb1ng ng\u00e0y. Tuy nhi\u00ean khi \u00e1p d\u1ee5ng v\u00e0o b\u00e0i t\u1eadp, ch\u00fang ta kh\u00f4ng th\u1ec3 d\u00f9ng nh\u1eefng chi\u1ebfc th\u01b0\u1edbc n\u00e0y \u0111\u1ec3 \u0111o \u0111\u1ed9 d\u00e0i. Ch\u00ednh v\u00ec v\u1eady, c\u00e1c em c\u1ea7n h\u1ecdc th\u00eam c\u00f4ng th\u1ee9c t\u00ednh \u0111\u1ed9 d\u00e0i kho\u1ea3ng c\u00e1ch, c\u00f4ng th\u1ee9c t\u00ednh qu\u00e3ng \u0111\u01b0\u1eddng,\u2026<\/p>\n\n\n\n<p>\u01af\u1edbc l\u01b0\u1ee3ng \u0111\u1ed9 d\u00e0i b\u1eb1ng tay<\/p>\n\n\n\n<p>B\u00ean c\u1ea1nh vi\u1ec7c s\u1eed d\u1ee5ng th\u01b0\u1edbc, \u0111\u00f4i khi ch\u00fang ta kh\u00f4ng ti\u1ec7n \u0111\u1ec3 t\u00ecm ki\u1ebfm th\u01b0\u1edbc \u0111o. Ch\u00fang ta ho\u00e0n to\u00e0n c\u00f3 th\u1ec3 \u01b0\u1edbc l\u01b0\u1ee3ng \u0111\u1ed9 d\u00e0i b\u1eb1ng tay. Tuy nhi\u00ean, c\u00e1ch x\u00e1c \u0111\u1ecbnh \u0111\u1ed9 d\u00e0i n\u00e0y c\u00f3 th\u1ec3 s\u1ebd kh\u00f4ng ch\u00ednh x\u00e1c. C\u00e1c em ch\u1ec9 n\u00ean tham kh\u1ea3o ch\u1ee9 kh\u00f4ng n\u00ean \u00e1p d\u1ee5ng nhi\u1ec1u trong b\u00e0i h\u1ecdc, ho\u1eb7c t\u00ednh to\u00e1n. \u0110\u1ec3 c\u00f3 th\u1ec3 d\u00f9ng \u0111\u01b0\u1ee3c c\u00e1ch \u01b0\u1edbc l\u01b0\u1ee3ng \u0111\u1ed9 d\u00e0i b\u1eb1ng tay. Ch\u00fang ta c\u1ea7n bi\u1ebft \u0111\u1ed9 d\u00e0i m\u1ed9t gang tay c\u1ee7a m\u00ecnh. \u0110\u1ed9 d\u00e0i 1 gang tay ng\u01b0\u1eddi l\u1edbn s\u1ebd kh\u00e1c v\u1edbi k\u00edch th\u01b0\u1edbc tay tr\u1ebb nh\u1ecf. \u0110\u1ed9 d\u00e0i 1 gang tay \u0111\u01b0\u1ee3c t\u00ednh t\u1eeb \u0111\u1ea7u ng\u00f3n c\u00e1i \u0111\u1ebfn \u0111\u1ea7u ng\u00f3n gi\u1eefa khi ch\u00fang ta x\u00f2e ng\u00f3n tay h\u1ebft c\u1ee1.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img decoding=\"async\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/10\/2.jpg\" alt=\" \u01af\u1edbc l\u01b0\u1ee3ng \u0111\u1ed9 d\u00e0i b\u1eb1ng tay \" class=\"wp-image-2320\" width=\"674\" height=\"354\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/10\/2.jpg 728w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/10\/2-300x157.jpg 300w\" sizes=\"(max-width: 674px) 100vw, 674px\" \/><figcaption> \u01af\u1edbc l\u01b0\u1ee3ng \u0111\u1ed9 d\u00e0i b\u1eb1ng tay <\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"620\" height=\"570\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/10\/3.jpg\" alt=\"\nG\u00f3c t\u1ea1o b\u1edfi ng\u00f3n \u00fat v\u00e0 ng\u00f3n c\u00e1i l\u00e0 90 \u0111\u1ed9, v\u00e0 l\u1ea7n l\u01b0\u1ee3t 60 \u0111\u1ed9 v\u1edbi ng\u00f3n tr\u1ecf,\n\n45 \u0111\u1ed9 ng\u00f3n gi\u1eefa, 30 \u0111\u1ed9 ng\u00f3n \u00e1p \u00fat.\" class=\"wp-image-2321\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/10\/3.jpg 620w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/10\/3-300x276.jpg 300w\" sizes=\"(max-width: 620px) 100vw, 620px\" \/><figcaption><br><strong>G\u00f3c t\u1ea1o b\u1edfi ng\u00f3n \u00fat v\u00e0 ng\u00f3n c\u00e1i l\u00e0 90 \u0111\u1ed9, v\u00e0 l\u1ea7n l\u01b0\u1ee3t 60 \u0111\u1ed9 v\u1edbi ng\u00f3n tr\u1ecf,<\/strong><br><strong>45 \u0111\u1ed9 ng\u00f3n gi\u1eefa, 30 \u0111\u1ed9 ng\u00f3n \u00e1p \u00fat.<\/strong><\/figcaption><\/figure>\n\n\n\n<p>C\u00e1ch quy \u0111\u1ed5i theo gang tay<\/p>\n\n\n\n<p>Ch\u00fang ta c\u00f3 th\u1ec3 \u0111o xem v\u1eadt d\u00e0i kho\u1ea3ng bao nhi\u00eau gang tay. Sau \u0111\u00f3 quy \u0111\u1ed5i t\u1eeb k\u00edch th\u01b0\u1edbc 1 gang tay ra k\u00edch th\u01b0\u1edbc c\u1ee7a v\u1eadt. V\u00ed d\u1ee5 1 gang tay ng\u01b0\u1eddi l\u1edbn kho\u1ea3ng 18cm. V\u1eadt \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh l\u00e0 d\u00e0i kho\u1ea3ng 4 gang tay c\u1ee7a ng\u01b0\u1eddi \u0111\u00f3. Ch\u00fang ta l\u1ea5y 18\u00d74 \u0111\u1ec3 \u0111\u01b0\u1ee3c s\u1ed1 \u0111o k\u00edch th\u01b0\u1edbc c\u1ee7a v\u1eadt theo h\u1ec7 cm. \u0110\u00e2y l\u00e0 c\u00e1ch \u01b0\u1edbc l\u01b0\u1ee3ng \u0111\u1ed9 d\u00e0i b\u1eb1ng tay m\u00e0 \u00f4ng b\u00e0, b\u1ed1 m\u1eb9 ch\u00fang ta th\u01b0\u1eddng s\u1eed d\u1ee5ng. N\u1ebfu con s\u1ed1 \u0111\u01b0\u1ee3c \u0111o ra qu\u00e1 l\u1edbn, c\u00e1c em c\u00f3 th\u1ec3 d\u00f9ng b\u1ea3ng \u0111\u01a1n v\u1ecb \u0111o \u0111\u1ed9 d\u00e0i \u0111\u1ec3 quy \u0111\u1ed5i. K\u00edch th\u01b0\u1edbc sau khi \u0111\u01b0\u1ee3c quy \u0111\u1ed5i d\u00f9 mang \u0111\u01a1n v\u1ecb \u0111o \u0111\u1ed9 d\u00e0i kh\u00e1c. Nh\u01b0ng tr\u00ean th\u1ef1c t\u1ebf k\u00edch th\u01b0\u1edbc v\u1eabn b\u1eb1ng nhau.<\/p>\n\n\n\n<p>T\u00e1c d\u1ee5ng<\/p>\n\n\n\n<p>\u0110\u00e2y l\u00e0 m\u1ed9t m\u1eb9o v\u1eb7t cu\u1ed9c s\u1ed1ng r\u1ea5t hay, c\u00e1c em c\u00f3 th\u1ec3 \u00e1p d\u1ee5ng trong tr\u01b0\u1eddng h\u1ee3p c\u1ea7n x\u00e1c \u0111\u1ecbnh nhanh. V\u1eadt ph\u1ea3i c\u00f3 k\u00edch th\u01b0\u1edbc kh\u00f4ng qu\u00e1 l\u1edbn c\u00e1c em m\u1edbi c\u00f3 th\u1ec3 \u00e1p d\u1ee5ng theo c\u00e1ch n\u00e0y. Tuy nhi\u00ean n\u1ebfu d\u00f9ng \u01b0\u1edbc l\u01b0\u1ee3ng b\u1eb1ng tay c\u00e1c em c\u00f3 th\u1ec3 g\u1eb7p ph\u1ea3i vi\u1ec7c \u0111o sai, \u0111o kh\u00f4ng chu\u1ea9n. H\u00e3y n\u1eafm r\u00f5 c\u00e1c \u01b0\u1edbc l\u01b0\u1ee3ng \u0111\u1ed9 d\u00e0i b\u1eb1ng gang tay tr\u01b0\u1edbc khi s\u1eed d\u1ee5ng nh\u00e9!<\/p>\n\n\n\n<p>B\u00e0i vi\u1ebft tr\u00ean \u0111\u00e2y c\u1ee7a ch\u00fang t\u00f4i \u0111\u00e3 \u0111em \u0111\u1ebfn cho c\u00e1c em c\u00e1ch \u0111o \u0111\u1ed9 d\u00e0i v\u00e0 b\u1ea3ng \u0111\u01a1n v\u1ecb \u0111o \u0111\u1ed9 d\u00e0i. \u0110\u00e2y \u0111\u1ec1u l\u00e0 nh\u1eefng \u0111\u01a1n v\u1ecb th\u00f4ng d\u1ee5ng v\u00e0 \u0111\u01b0\u1ee3c \u1ee9ng d\u1ee5ng nhi\u1ec1u trong vi\u1ec7c <a href=\"https:\/\/www.vietlearn.org\" data-internallinksmanager029f6b8e52c=\"2\" title=\"Vietlearn\" rel=\"nofollow\">h\u1ecdc t\u1eadp<\/a> v\u00e0 cu\u1ed9c s\u1ed1ng c\u1ee7a c\u00e1c em. C\u00e1c em n\u00ean h\u1ecdc thu\u1ed9c b\u1ea3ng \u0111\u01a1n v\u1ecb n\u00e0y \u0111\u1ec3 c\u00f3 th\u1ec3 l\u00e0m b\u00e0i t\u1eadp v\u1eadt l\u00fd l\u1edbp 6 d\u1ec5 d\u00e0ng nh\u1ea5t. Nh\u1eefng b\u00e0i t\u1eadp v\u1ec1 \u0111o \u0111\u1ed9 d\u00e0i s\u1ebd kh\u00f4ng c\u00f2n l\u00e0 qu\u00e1 kh\u00f3 kh\u0103n v\u1edbi c\u00e1c em n\u1eefa. Ch\u00fac c\u00e1c em h\u1ecdc t\u1eadp v\u00e0 r\u00e8n luy\u1ec7n th\u1eadt t\u1ed1t \u0111\u1ea1t \u0111\u01b0\u1ee3c k\u1ebft qu\u1ea3 nh\u01b0 \u00fd mu\u1ed1n c\u1ee7a m\u00ecnh.<\/p>\n\n\n\n<p><\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe title=\"\u0110o \u0111\u1ed9 d\u00e0i ( P.2 ) | V\u1eadt l\u00ed 6 | DT STUDY\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/RtFkufd7vtg?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n\n\n\n\n\n\n","protected":false},"excerpt":{"rendered":"<p>Ghi ch\u00fa: T\u00e0i li\u1ec7u tr\u00edch d\u1eabn Nh\u01b0 ch\u00fang ta \u0111\u00e3 bi\u1ebft \u0111o \u0111\u1ed9 d\u00e0i l\u00e0 c\u00e1ch \u0111o ch\u00ednh x\u00e1c chi\u1ec1u d\u00e0i, chi\u1ec1u r\u1ed9ng, k\u00edch th\u01b0\u1edbc c\u1ee7a m\u1ed9t v\u1eadt. Trong cu\u1ed9c s\u1ed1ng h\u00e0ng ng\u00e0y, vi\u1ec7c \u0111o \u0111\u1ed9 d\u00e0i \u0111\u01b0\u1ee3c \u1ee9ng d\u1ee5ng r\u1ea5t nhi\u1ec1u. Ch\u00ednh v\u00ec v\u1eady, \u0111o \u0111\u1ed9 d\u00e0i \u0111\u00e3 tr\u1edf th\u00e0nh m\u1ed9t b\u00e0i h\u1ecdc kh\u00f4ng [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":2318,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_disable_autopaging":false},"categories":[4,7],"tags":[],"class_list":["post-1131","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-trung-hoc","category-vat-ly"],"_links":{"self":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/1131","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/comments?post=1131"}],"version-history":[{"count":0,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/1131\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media\/2318"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=1131"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=1131"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=1131"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}