C\u00e2u 14:<\/b>\u00a0T\u00ecm c\u00e1c gi\u00e1 tr\u1ecb l\u1edbn nh\u1ea5t v\u00e0 nh\u1ecf nh\u1ea5t c\u1ee7a h\u00e0m s\u1ed1<\/p>\n
<\/p>\n
A. max y = 2\u221c2 , min y=1.\u00a0\u00a0\u00a0B. max y = 2\u221c2 , min y = \u221c2 .<\/p>\n
C. max y=48, min y=19. \u00a0\u00a0\u00a0D. max y = \u221c8 , min y = \u221c2 .<\/p>\n
C\u00e2u 15:<\/b>\u00a0T\u00ecm c\u00e1c gi\u00e1 tr\u1ecb l\u1edbn nh\u1ea5t v\u00e0 nh\u1ecf nh\u1ea5t c\u1ee7a h\u00e0m s\u1ed1 y = x2\/3<\/sup>(20 – x) tr\u00ean \u0111o\u1ea1n [1; 10]<\/p>\n <\/p>\n C\u00e2u 16:<\/b>\u00a0V\u1edbi l\u00e0 m\u1ed9t s\u1ed1 th\u1ef1c d\u01b0\u01a1ng v\u00e0 h\u00e0m s\u1ed1<\/p>\n <\/p>\n ngh\u1ecbch bi\u1ebfn tr\u00ean kho\u1ea3ng (0; +\u221e). Kh\u1eb3ng \u0111\u1ecbnh n\u00e0o sau \u0111\u00e2y l\u00e0 \u0111\u00fang?<\/p>\n <\/p>\n C\u00e2u 17:<\/b>\u00a0S\u1ed1 n\u00e0o l\u1edbn nh\u1ea5t trong c\u00e1c s\u1ed1 \u0111\u01b0\u1ee3c li\u1ec7t k\u00ea trong b\u1ed1n ph\u01b0\u01a1ng \u00e1n A,B,C,D d\u01b0\u1edbi \u0111\u00e2y?<\/p>\n <\/p>\n C\u00e2u 18:<\/b>\u00a0T\u00ecm \u0111\u1ea1o h\u00e0m c\u1ee7a h\u00e0m s\u1ed1<\/p>\n <\/p>\n C\u00e2u 19:<\/b>\u00a0S\u1ed1 n\u00e0o l\u1edbn nh\u1ea5t trong c\u00e1c s\u1ed1 \u0111\u01b0\u1ee3c li\u1ec7t k\u00ea trong b\u1ed1n ph\u01b0\u01a1ng \u00e1n A,B,C,D d\u01b0\u1edbi \u0111\u00e2y?<\/p>\n <\/p>\n C\u00e2u 20:<\/b>\u00a0Cho a v\u00e0 b l\u00e0 hai s\u1ed1 d\u01b0\u01a1ng. T\u00ecm gi\u00e1 tr\u1ecb l\u1edbn nh\u1ea5t c\u1ee7a h\u00e0m s\u1ed1 y = xa<\/sup>(1 – x)b<\/sup>\u00a0tr\u00ean [0;1].<\/p>\n <\/p>\n H\u01b0\u1edbng d\u1eabn gi\u1ea3i v\u00e0 \u0110\u00e1p \u00e1n<\/b><\/p>\n C\u00e2u 14:<\/b><\/p>\n T\u1eadp x\u00e1c \u0111\u1ecbnh D = [0; 1]<\/p>\n Ta c\u00f3:<\/p>\n <\/p>\n y(0) = y(1) = 1; y(1\/2) = \u221c8. T\u1eeb \u0111\u00f3 max y = y(1\/2) = \u221c8, min y = y(0) = 1<\/p>\n C\u00e2u 15:<\/b><\/p>\n <\/p>\n y’ = 0 <=> x = 8<\/p>\n Ta c\u00f3: y(1) = 19, y(8) = 48, y(10) = 105\/3<\/sup>\u00a0\u2248 46,6 > 19<\/p>\n T\u1eeb \u0111\u00f3:<\/p>\n <\/p>\n C\u00e2u 16:<\/b><\/p>\n H\u00e0m s\u1ed1<\/p>\n <\/p>\n ngh\u1ecbch bi\u1ebfn tr\u00ean (0; +\u221e) n\u00ean \u221c\u03b1 – 2\u03b1 < 0<\/p>\n <\/p>\n C\u00e2u 17:<\/b><\/p>\n Vi\u1ebft l\u1ea1i c\u00e1c s\u1ed1 d\u01b0\u1edbi d\u1ea1ng c\u00f9ng c\u0103n b\u1eadc 4:<\/p>\n <\/p>\n T\u1eeb \u0111\u00f3 ta th\u1ea5y 5\u221a2 l\u00e0 l\u1edbn nh\u1ea5t<\/p>\n C\u00e2u 18:<\/b><\/p>\n Vi\u1ebft l\u1ea1i<\/p>\n <\/p>\n C\u00e2u 19:<\/b><\/p>\n Vi\u1ebft l\u1ea1i c\u00e1c s\u1ed1<\/p>\n <\/p>\n T\u1eeb \u0111\u00f3 ta th\u1ea5y s\u1ed1 l\u1edbn nh\u1ea5t l\u00e0<\/p>\n <\/p>\n C\u00e2u 20:<\/b><\/p>\n y’ = xa – 1<\/sup>(1 – x)b – 1<\/sup>(a – ax – bx). Tr\u00ean kho\u1ea3ng (0 ;1)<\/p>\n <\/p>\n Ta c\u00f3: y(0) = y(1) = 0;<\/p>\n <\/p>\n","protected":false},"excerpt":{"rendered":" C\u00e2u 14:\u00a0T\u00ecm c\u00e1c gi\u00e1 tr\u1ecb l\u1edbn nh\u1ea5t v\u00e0 nh\u1ecf nh\u1ea5t c\u1ee7a h\u00e0m s\u1ed1 A. max y = 2\u221c2 , min y=1.\u00a0\u00a0\u00a0B. max y = 2\u221c2 , min y = \u221c2 . C. max y=48, min y=19. \u00a0\u00a0\u00a0D. max y = \u221c8 , min y = \u221c2 . C\u00e2u 15:\u00a0T\u00ecm c\u00e1c gi\u00e1 tr\u1ecb l\u1edbn nh\u1ea5t v\u00e0 […]<\/p>\n","protected":false},"author":3,"featured_media":27547,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_mi_skip_tracking":false,"tdm_status":"","tdm_grid_status":""},"categories":[157],"tags":[1447,1446],"yoast_head":"\n\n\n
\n 14-C<\/td>\n 15-D<\/td>\n 16-B<\/td>\n 17-D<\/td>\n 18-C<\/td>\n 19-B<\/td>\n 20-D<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n