GI\u1ea2I B\u00c0I TO\u00c1N B\u1eb0NG C\u00c1CH L\u1eacP PH\u01af\u01a0NG TR\u00ccNH<\/h2>\n

I) Ph\u01b0\u01a1ng ph\u00e1p gi\u1ea3i<\/p>\n

a) C\u00e1c b\u01b0\u1edbc gi\u1ea3i b\u00e0i to\u00e1n b\u1eb1ng c\u00e1ch l\u1eadp ph\u01b0\u01a1ng tr\u00ecnh<\/p>\n

B\u01b0\u1edbc 1. L\u1eadp ph\u01b0\u01a1ng tr\u00ecnh<\/p>\n

\n
• Ch\u1ecdn \u1ea9n, \u0111\u01a1n v\u1ecb cho \u1ea9n v\u00e0 \u0111\u1eb7t \u0111i\u1ec1u ki\u1ec7n th\u00edch h\u1ee3p cho \u1ea9n<\/li>\n
• Bi\u1ec1u di\u1ec5n c\u00e1c \u0111\u1ea1i l\u01b0\u1ee3ng theo \u1ea9n ( c\u00e1c em c\u1ea7n l\u01b0u \u00fd ph\u1ea3i th\u1ed1ng nh\u1ea5t \u0111\u01a1n v\u1ecb)<\/li>\n
• L\u1eadp ph\u01b0\u01a1ng tr\u00ecnh bi\u1ec3u th\u1ecb c\u00e1c m\u1ed1i quan h\u1ec7 gi\u1eefa c\u00e1c \u0111\u1ea1i l\u01b0\u1ee3ng.<\/li>\n<\/ul>\n

  B\u01b0\u1edbc 2. Gi\u1ea3i ph\u01b0\u01a1ng tr\u00ecnh<\/p>\n

  B\u01b0\u1edbc 3. Ki\u1ec3m tra xem trong c\u00e1c nghi\u1ec7m c\u1ee7a ph\u01b0\u01a1ng tr\u00ecnh, nghi\u1ec7m n\u00e0o th\u00edch h\u1ee3p v\u1edbi b\u00e0i to\u00e1n v\u00e0 k\u1ebft lu\u1eadn.<\/p>\n

  b) C\u00e1c d\u1ea1ng\u00a0gi\u1ea3i b\u00e0i to\u00e1n b\u1eb1ng c\u00e1ch l\u1eadp ph\u01b0\u01a1ng tr\u00ecnh th\u01b0\u1eddng g\u1eb7p.<\/h3>\n

  \n
  • D\u1ea1ng to\u00e1n chuy\u1ec3n \u0111\u1ed9ng.<\/li>\n
  • D\u1ea1ng to\u00e1n li\u00ean quan \u0111\u1ebfn c\u00e1c ki\u1ebfn th\u1ee9c h\u00ecnh h\u1ecdc.<\/li>\n
  • D\u1ea1ng to\u00e1n c\u00f4ng vi\u1ec7c l\u00e0m chung, l\u00e0m ri\u00eang.<\/li>\n
  • D\u1ea1ng to\u00e1n ch\u1ea3y chung, ch\u1ea3y ri\u00eang c\u1ee7a v\u00f2i n\u01b0\u1edbc.<\/li>\n
  • D\u1ea1ng to\u00e1n t\u00ecm s\u1ed1.<\/li>\n
  • D\u1ea1ng to\u00e1n s\u1eed d\u1ee5ng c\u00e1c ki\u1ebfn th\u1ee9c v\u1ec1 %.<\/li>\n<\/ul>\n

    c) C\u00e1c c\u00f4ng th\u1ee9c th\u01b0\u1eddng d\u00f9ng<\/p>\n

    \n
    • G\u1ecdi s l\u00e0 qu\u00e3ng \u0111\u01b0\u1eddng \u0111i \u0111\u01b0\u1ee3c t\u01b0\u01a1ng \u1ee9ng v\u1edbi v l\u00e0 v\u1eadn t\u1ed1c v\u00e0 t l\u00e0 th\u1eddi gian, ta c\u00f3:<\/li>\n
    • V\u1eadn t\u1ed1c chuy\u1ec3n \u0111\u1ed9ng v c\u1ee7a t\u00e0u, thuy\u1ec1n khi c\u00f3 s\u1ef1 t\u00e1c \u0111\u1ed9ng c\u1ee7a d\u00f2ng n\u01b0\u1edbc
      \nv\u00a0xu\u00f4i d\u00f2ng\u00a0= v\u00a0th\u1ef1c\u00a0+ v\u00a0d\u00f2ng n\u01b0\u1edbc
      \nv\u00a0ng\u01b0\u1ee3c d\u00f2ng\u00a0= v\u00a0th\u1ef1c\u00a0\u2013 v\u00a0d\u00f2ng n\u01b0\u1edbc<\/li>\n
    • G\u1ecdi A l\u00e0 kh\u1ed1i l\u01b0\u1ee3ng c\u00f4ng vi\u1ec7c t\u01b0\u01a1ng \u1ee9ng v\u1edbi N l\u00e0 n\u0103ng su\u1ea5t v\u00e0 T l\u00e0 th\u1eddi gian , ta c\u00f3 A = N.T<\/li>\n
    • Bi\u1ec3u di\u1ec5n s\u1ed1:<\/li>\n
    • X b\u1eb1ng a% c\u1ee7a b th\u00ec<\/li>\n
    • C\u00e1c c\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00edch tam gi\u00e1c, h\u00ecnh vu\u00f4ng, h\u00ecnh ch\u1eef nh\u1eadt v\u00e0 \u0111\u1ecbnh l\u00fd Py-ta-go.<\/li>\n<\/ul>\n

      M\u1ed9t s\u1ed1 b\u00e0i t\u1eadp v\u1ec1 gi\u1ea3i b\u00e0i to\u00e1n b\u1eb1ng c\u00e1ch l\u1eadp ph\u01b0\u01a1ng tr\u00ecnh<\/h3>\n

      V\u00ed d\u1ee5 1. Qu\u00e3ng \u0111\u01b0\u1eddng AB d\u00e0i 120km. Hai \u00f4 t\u00f4 kh\u1edfi h\u00e0nh c\u00f9ng m\u1ed9t l\u00fac \u0111i t\u1eeb A \u0111\u1ebfn B, \u00f4 t\u00f4 th\u1ee9 nh\u1ea5t ch\u1ea1y nhanh h\u01a1n \u00f4 t\u00f4 th\u1ee9 hai 10km\/h n\u00ean \u0111\u1ebfn B tr\u01b0\u1edbc \u00f4 t\u00f4 th\u1ee9 hai 24 ph\u00fat. T\u00ednh v\u1eadn t\u1ed1c m\u1ed7i xe.<\/p>\n

      B\u00e0i gi\u1ea3i<\/p>\n

      G\u1ecdi v\u1eadn t\u1ed1c \u00f4 t\u00f4 th\u1ee9 nh\u1ea5t l\u00e0 x (km\/h), (x>0)
      \nTa c\u00f3 v\u1eadn t\u1ed1c \u00f4 t\u00f4 th\u1ee9 hai l\u00e0 (x-10) (km\/h)
      \nTh\u1eddi gian \u00f4 t\u00f4 th\u1ee9 nh\u1ea5t \u0111i h\u1ebft qu\u00e3ng \u0111\u01b0\u1eddng AB l\u00e0\u00a0(h)
      \nTh\u1eddi gian \u00f4 t\u00f4 th\u1ee9 hai \u0111i h\u1ebft qu\u00e3ng \u0111\u01b0\u1eddng AB l\u00e0\u00a0(h)<\/p>\n

      V\u00ec \u00f4 t\u00f4 th\u1ee9 nh\u1ea5tch\u1ea1y nhanh h\u01a1n \u00f4 t\u00f4 th\u1ee9 hai 10km\/h n\u00ean \u0111\u1ebfn B tr\u01b0\u1edbc \u00f4 t\u00f4 th\u1ee9 hai 24 ph\u00fat (h)<\/p>\n

      Do \u0111\u00f3 ta c\u00f3 ph\u01b0\u01a1ng tr\u00ecnh:<\/p>\n

      Gi\u1ea3i ph\u01b0\u01a1ng tr\u00ecnh ta \u0111\u01b0\u1ee3c: x1=60 (nh\u1eadn), x2=-50 (lo\u1ea1i)<\/p>\n

      V\u1eady v\u1eadn t\u1ed1c c\u1ee7a \u00f4 t\u00f4 th\u1ee9 nh\u1ea5t l\u00e0 60km\/h, v\u1eadn t\u1ed1c c\u1ee7a \u00f4 t\u00f4 th\u1ee9 hai l\u00e0 50km\/h<\/p>\n

      L\u01b0u \u00fd: C\u00e1c em c\u1ea7n th\u1ed1ng nh\u1ea5t \u0111\u01a1n v\u1ecb (km\/h), \u0111\u1ed5i ph\u00fat sang gi\u1edd, l\u1eadp ph\u01b0\u01a1ng tr\u00ecnh ph\u00f9 h\u1ee3p v\u00e0 gi\u1ea3i ph\u01b0\u01a1ng tr\u00ecnh b\u1eadc hai c\u1ea9n th\u1eadn, sau khi t\u00ecm \u0111\u01b0\u1ee3c nghi\u1ec7m, so s\u00e1nh nghi\u1ec7m v\u1edbi \u0111i\u1ec1u ki\u1ec7n ban \u0111\u1ea7u.<\/p>\n

      V\u00ed d\u1ee5 2. M\u1ed9t khu v\u01b0\u1eddn h\u00ecnh ch\u1eef nh\u1eadt c\u00f3 chu vi 280m. Ng\u01b0\u1eddi ta l\u00e0m m\u1ed9t l\u1ed1i \u0111i xung quanh v\u01b0\u1eddn (thu\u1ed9c \u0111\u1ea5t v\u01b0\u1eddn) r\u1ed9ng 2m, di\u1ec7n t\u00edch c\u00f2n l\u1ea1i \u0111\u1ec3 tr\u1ed3ng tr\u1ecdt l\u00e0 4256m2. T\u00ednh k\u00edch th\u01b0\u1edbc c\u00e1c c\u1ea1nh c\u1ee7a khu v\u01b0\u1eddn \u0111\u00f3.<\/p>\n

      B\u00e0i gi\u1ea3i<\/p>\n

      G\u1ecdi m\u1ed9t c\u1ea1nh c\u1ee7a khu v\u01b0\u1eddn l\u00e0 x (m), (x<140)<\/p>\n

      C\u1ea1nh c\u00f2n l\u1ea1i c\u1ee7a khu v\u01b0\u1eddn l\u00e0 (140-x) (m)<\/p>\n

      Do l\u1ed1i \u0111i xung quanh v\u01b0\u1eddn r\u1ed9ng 2m n\u00ean k\u00edch th\u01b0\u1edbc c\u00e1c c\u1ea1nh c\u00f2n l\u1ea1i l\u00e0 (x-4), (140-x-4) (m)<\/p>\n

      V\u00ec di\u1ec7n t\u00edch c\u00f2n l\u1ea1i \u0111\u1ec3 tr\u1ed3ng tr\u1ecdt l\u00e0 4256m2, do \u0111\u00f3 ta c\u00f3 ph\u01b0\u01a1ng tr\u00ecnh:<\/p>\n

      Gi\u1ea3i ph\u01b0\u01a1ng tr\u00ecnh ta \u0111\u01b0\u1ee3c x1=80 (nh\u1eadn), x2=60 (nh\u1eadn)<\/p>\n

      V\u1eady c\u00e1c c\u1ea1nh c\u1ee7a khu v\u01b0\u1eddn h\u00ecnh ch\u1eef nh\u1eadt l\u00e0 80m, 60m.<\/p>\n

      L\u01b0u \u00fd: C\u00e1c em c\u1ea7n th\u1ed1ng nh\u1ea5t \u0111\u01a1n v\u1ecb (m), n\u1ebfu \u0111\u1ec1 b\u00e0i cho nhi\u1ec1u \u0111\u01a1n v\u1ecb ph\u1ea3i quy \u0111\u1ed5i v\u1ec1 m\u1ed9t \u0111\u01a1n v\u1ecb duy nh\u1ea5t; vi\u1ebft \u0111\u00fang c\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00edch h\u00ecnh ch\u1eef nh\u1eadt (Di\u1ec7n t\u00edch=chi\u1ec1u d\u00e0i x chi\u1ec1u r\u1ed9ng); gi\u1ea3i ph\u01b0\u01a1ng tr\u00ecnh b\u1eadc hai,t\u00ecm nghi\u1ec7m, so s\u00e1nh nghi\u1ec7m v\u1edbi \u0111i\u1ec1u ki\u1ec7n ban \u0111\u1ea7u<\/p>\n

      Tr\u00ean \u0111\u00e2y l\u00e0 ph\u01b0\u01a1ng ph\u00e1p gi\u1ea3i v\u00e0 m\u1ed9t s\u1ed1 b\u00e0i t\u1eadp minh h\u1ecda d\u1ea1ng gi\u1ea3i b\u00e0i to\u00e1n b\u1eb1ng c\u00e1ch l\u1eadp ph\u01b0\u01a1ng tr\u00ecnh, c\u00e1c em tham kh\u1ea3o nh\u00e9.<\/p>\n","protected":false},"excerpt":{"rendered":"

      GI\u1ea2I B\u00c0I TO\u00c1N B\u1eb0NG C\u00c1CH L\u1eacP PH\u01af\u01a0NG TR\u00ccNH I) Ph\u01b0\u01a1ng ph\u00e1p gi\u1ea3i a) C\u00e1c b\u01b0\u1edbc gi\u1ea3i b\u00e0i to\u00e1n b\u1eb1ng c\u00e1ch l\u1eadp ph\u01b0\u01a1ng tr\u00ecnh B\u01b0\u1edbc 1. L\u1eadp ph\u01b0\u01a1ng tr\u00ecnh Ch\u1ecdn \u1ea9n,… <\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[35,443],"tags":[],"amp_enabled":true,"_links":{"self":[{"href":"https:\/\/onthitot.com\/wp-json\/wp\/v2\/posts\/5127"}],"collection":[{"href":"https:\/\/onthitot.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/onthitot.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/onthitot.com\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/onthitot.com\/wp-json\/wp\/v2\/comments?post=5127"}],"version-history":[{"count":0,"href":"https:\/\/onthitot.com\/wp-json\/wp\/v2\/posts\/5127\/revisions"}],"wp:attachment":[{"href":"https:\/\/onthitot.com\/wp-json\/wp\/v2\/media?parent=5127"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/onthitot.com\/wp-json\/wp\/v2\/categories?post=5127"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/onthitot.com\/wp-json\/wp\/v2\/tags?post=5127"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}