V\u1edbi m\u1ed9t t\u1edd gi\u1ea5y, b\u1ea1n c\u00f3 th\u1ec3 th\u1ef1c hi\u1ec7n m\u1ed9t s\u1ed1 tr\u00f2 ch\u01a1i to\u00e1n h\u1ecdc th\u00fa v\u1ee5 d\u01b0\u1edbi \u0111\u00e2y. B\u1ea1n th\u1eed th\u1ef1c hi\u1ec7n xem.<\/p>\n\n\n\n
C\u1eaft \u0111\u01b0\u1eddng h\u00ecnh sin (\u0111\u01b0\u1eddng l\u01b0\u1ee3n s\u00f3ng).Cu\u1ed9n ch\u1eb7t m\u1ed9t t\u1edd gi\u1ea5y h\u00ecnh ch\u1eef nh\u1eadt v\u00e0o m\u1ed9t vi\u00ean ph\u1ea5n, sau \u0111\u00f3 d\u00f9ng dao c\u1eaft nghi\u00eang m\u1ed9t nh\u00e1t. Ti\u1ebfp theo m\u1edf trang gi\u1ea5y ra, b\u1ea1n s\u1ebd \u0111\u01b0\u1ee3c m\u1ed9t \u0111\u01b0\u1eddng l\u01b0\u1ee3n s\u00f3ng l\u00e0 \u0111\u01b0\u1eddng h\u00ecnh sin.<\/p>\n\n\n\n
G\u1ea5p \u0111\u01b0\u1eddng parab\u00f4n. L\u1ea5y m\u1ea3nh gi\u1ea5y h\u00ecnh ch\u1eef nh\u1eadt ABCD. G\u1eadp nghi\u00eang g\u00f3c m\u1ea3nh gi\u1ea5y sao cho \u0111\u1ec9nh C n\u1eb1m tr\u00ean c\u1ea1nh AB, l\u1eb7p l\u1ea1i nhi\u1ec1u l\u1ea7n ta s\u1ebd nh\u1eadn \u0111\u01b0\u1ee3c m\u1ed9t \u0111\u01b0\u1eddng bao l\u00e0 parab\u00f4n.<\/p>\n\n\n\n
G\u1eadp \u0111\u01b0\u1eddng elip. D\u00f9ng m\u1ea3nh gi\u1ea5y h\u00ecnh tr\u00f2n, ch\u1ecdn \u0111i\u1ec3m A tu\u1ef3 \u00fd b\u00ean trong v\u00f2ng tr\u00f2n nh\u01b0ng kh\u00f4ng tr\u00f9ng v\u1edbi t\u00e2m. Sau \u0111\u00f3 g\u1eadp m\u00e9p gi\u1ea5y sao cho c\u00e1c m\u00e9p cung tr\u00f2n lu\u00f4n qua \u0111i\u1ec3m A. L\u1eb7p l\u1ea1i nhi\u1ec1u l\u1ea7n \u0111\u01b0\u1eddng bao c\u1ee7a m\u00e9p g\u1ea5p th\u1eb3ng s\u1ebd l\u00e0 \u0111\u01b0\u1eddng bao c\u1ee7a m\u1ed9t elip. (Xem h\u00ecnh trang sau)<\/p>\n\n\n\n
\u0110\u01b0\u1eddng bao l\u00e0 \u0111\u1ed1i t\u01b0\u1ee3ng nghi\u00ean c\u1ee9u c\u1ee7a m\u1ed9t ng\u00e0nh to\u00e1n h\u1ecdc l\u00e0 h\u00ecnh h\u1ecdc vi ph\u00e2n, \u0111\u00e2y l\u00e0 ng\u00e0nh to\u00e1n h\u1ecdc c\u00f3 li\u00ean quan \u0111\u1ebfn nhi\u1ec1u v\u1ea5n \u0111\u1ec1 th\u1ef1c t\u1ebf. Ch\u1eafc b\u1ea1n \u0111\u00e3 t\u1eebng th\u1ea5y c\u00e1c v\u00f2i phun n\u01b0\u1edbc \u1edf c\u00e1c c\u00f4ng vi\u00ean, c\u00e1c tia n\u01b0\u1edbc phun t\u1eeb v\u00f2i gi\u1ebfng phun v\u1ebd l\u00ean m\u1ed9t h\u1ecd \u0111\u01b0\u1eddng cong n\u1eb1m tr\u00ean c\u00f9ng m\u1ed9t m\u1eb7t ph\u1eb3ng, c\u00e1c \u0111\u01b0\u1eddng cong ph\u1eb3ng n\u00e0y gi\u1ed1ng h\u00ecnh m\u1ed9t \u0111\u01b0\u1eddng cong parab\u00f4n. Tr\u00ean c\u00e1c b\u1ee9c \u1ea3nh phong c\u1ea3nh b\u1ea1n s\u1ebd nh\u00ecn th\u1ea5y r\u00f5 h\u00ecnh bao c\u1ee7a ch\u00fang.<\/p>\n\n\n\n
T\u1eeb kho\u00e1: \u0110\u01b0\u1eddng h\u00ecnh sin; \u0110\u01b0\u1eddng parab\u00f4n; Elip; V\u1ea5n \u0111\u1ec1 h\u00ecnh<\/p>\n\n\n\n
<\/p>\n\n\n\n\n\n\n","protected":false},"excerpt":{"rendered":"
V\u1edbi m\u1ed9t t\u1edd gi\u1ea5y, b\u1ea1n c\u00f3 th\u1ec3 th\u1ef1c hi\u1ec7n m\u1ed9t s\u1ed1 tr\u00f2 ch\u01a1i to\u00e1n h\u1ecdc th\u00fa v\u1ee5 d\u01b0\u1edbi \u0111\u00e2y. B\u1ea1n th\u1eed th\u1ef1c hi\u1ec7n xem. C\u1eaft \u0111\u01b0\u1eddng h\u00ecnh sin (\u0111\u01b0\u1eddng l\u01b0\u1ee3n s\u00f3ng).Cu\u1ed9n ch\u1eb7t m\u1ed9t t\u1edd gi\u1ea5y h\u00ecnh ch\u1eef nh\u1eadt v\u00e0o m\u1ed9t vi\u00ean ph\u1ea5n, sau \u0111\u00f3 d\u00f9ng dao c\u1eaft nghi\u00eang m\u1ed9t nh\u00e1t. Ti\u1ebfp theo m\u1edf trang gi\u1ea5y […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_disable_autopaging":false},"categories":[15,9],"tags":[],"class_list":["post-7561","post","type-post","status-publish","format-standard","hentry","category-hoi-dap-khoa-hoc","category-toan-hoc"],"_links":{"self":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/7561","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=7561"}],"version-history":[{"count":0,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/7561\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=7561"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=7561"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=7561"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}