B\u00e0i 60 (trang 178 sgk Gi\u1ea3i T\u00edch 12 n\u00e2ng cao)<\/b><\/span><\/p>\n <\/p>\n A. 9 \u00a0\u00a0\u00a0 B. 3\u00a0\u00a0\u00a0C. 81 \u00a0\u00a0\u00a0D. 8<\/p>\n L\u1eddi gi\u1ea3i:<\/b><\/p>\n <\/p>\n V\u1eady kh\u1eb3ng \u0111\u1ecbnh \u0111\u00fang l\u00e0 B.<\/p>\n B\u00e0i 61 (trang 178 sgk Gi\u1ea3i T\u00edch 12 n\u00e2ng cao):<\/b><\/span><\/p>\n <\/p>\n A. e4<\/sup> \u00a0\u00a0\u00a0 B. e4<\/sup>-1 \u00a0\u00a0\u00a0C. 4e4<\/sup> \u00a0\u00a0\u00a0 D. 3e4<\/sup>-1<\/p>\n L\u1eddi gi\u1ea3i:<\/b><\/p>\n <\/p>\n B\u00e0i 62 (trang 178 sgk Gi\u1ea3i T\u00edch 12 n\u00e2ng cao):<\/b><\/span><\/p>\n <\/p>\n L\u1eddi gi\u1ea3i:<\/b><\/p>\n <\/p>\n V\u1eady kh\u1eb3ng \u0111\u1ecbnh \u0111\u00fang l\u00e0 D.<\/p>\n B\u00e0i 63 (trang 178 sgk Gi\u1ea3i T\u00edch 12 n\u00e2ng cao):<\/b><\/span><\/p>\n Di\u1ec7n t\u00edch h\u00ecnh ph\u1eb3ng n\u1eb1m trong ph\u1ea7n t\u1eeb th\u1ee9 nh\u1ea5t gi\u1edbi h\u1ea1n b\u1edfi \u0111\u01b0\u1eddng th\u1eb3ng y = 4x v\u00e0 \u0111\u1ed3 th\u1ecb h\u00e0m s\u1ed1 y=x3<\/sup>\u00a0l\u00e0:<\/p>\n A. 4\u00a0\u00a0\u00a0B. 5\u00a0\u00a0\u00a0C. 3\u00a0\u00a0\u00a0D. 3,5<\/p>\n L\u1eddi gi\u1ea3i:<\/b><\/p>\n <\/p>\n V\u1edbi g\u00f3c nh\u1ecdn ph\u1ea7n t\u01b0 th\u1ee9 nh\u1ea5t ta c\u00f3 x\u22650 n\u00ean lo\u1ea1i x = -2<\/p>\n <\/p>\n V\u1eady kh\u1eb3ng \u0111\u1ecbnh \u0111\u00fang l\u00e0 A.<\/p>\n B\u00e0i 64 (trang 178 sgk Gi\u1ea3i T\u00edch 12 n\u00e2ng cao):<\/b><\/span><\/p>\n Di\u1ec7n t\u00edch h\u00ecnh ph\u1eb3ng n\u1eb1m trong g\u00f3c ph\u1ea7n t\u01b0 th\u1ee9 nh\u1ea5t \u0111\u01b0\u1ee3c gi\u1edbi h\u1ea1n b\u1edfi hai \u0111\u01b0\u1eddng th\u1eb3ng y = 8x; y = x v\u00e0 \u0111\u1ed3 th\u1ecb h\u00e0m s\u1ed1 y=x3<\/sup>\u00a0l\u00e0:<\/p>\n A. 12\u00a0\u00a0\u00a0B. 15,75\u00a0\u00a0\u00a0C. 6,75\u00a0\u00a0\u00a0D. 4<\/p>\n L\u1eddi gi\u1ea3i:<\/b><\/p>\n <\/p>\n <\/p>\n V\u1eady kh\u1eb3ng \u0111\u1ecbnh \u0111\u00fang l\u00e0 B<\/p>\n B\u00e0i 65 (trang 178 sgk Gi\u1ea3i T\u00edch 12 n\u00e2ng cao):<\/b><\/span><\/p>\n Di\u1ec7n t\u00edch h\u00ecnh ph\u1eb3ng n\u1eb1m trong g\u00f3c ph\u1ea7n t\u01b0 th\u1ee9 nh\u1ea5t gi\u1edbi h\u1ea1n b\u1edfi \u0111\u01b0\u1eddng th\u1eb3ng y = 2x v\u00e0 \u0111\u1ed3 th\u1ecb h\u00e0m s\u1ed1 y=x2<\/sup>l\u00e0:<\/p>\n <\/p>\n L\u1eddi gi\u1ea3i:<\/b><\/p>\n <\/p>\n V\u1eady ch\u1ecdn \u0111\u00e1p \u00e1n A<\/p>\n B\u00e0i 66 (trang 179 sgk Gi\u1ea3i T\u00edch 12 n\u00e2ng cao):<\/b><\/span><\/p>\n Cho h\u00ecnh ph\u1eb3ng A \u0111\u01b0\u1ee3c gi\u1edbi h\u1ea1n b\u1edfi hai \u0111\u1ed3 th\u1ecb y=x2<\/sup>\u00a0v\u00e0 y=6-|x|. T\u00ednh th\u1ec3 t\u00edch kh\u1ed1i tr\u00f2n xoay t\u1ea1o \u0111\u01b0\u1ee3c khi quay A quanh tr\u1ee5c tung l\u00e0:<\/p>\n <\/p>\n L\u1eddi gi\u1ea3i:<\/b><\/p>\n <\/p>\n 6-|x|=x2<\/sup>\u00a0<=> |x2<\/sup>\u00a0|+|x|-6=0<\/p>\n <=> |x|=2 <=> x=\u00b12 => y = 4<\/p>\n + y=x2<\/sup>\u00a0<=> x=\u00b1\u221ay<\/p>\n Do t\u00ednh \u0111\u1ed1i x\u1ee9ng qua Oy c\u1ee7a parabol y=x2<\/sup>\u00a0v\u00e0 \u0111\u01b0\u1eddng th\u1eb3ng y=6-|x| ta c\u00f3:<\/p>\n <\/p>\n V\u1eady kh\u1eb3ng \u0111\u1ecbnh \u0111\u00fang l\u00e0 A.<\/p>\n B\u00e0i 67 (trang 179 sgk Gi\u1ea3i T\u00edch 12 n\u00e2ng cao):<\/b><\/span><\/p>\n Cho a, b l\u00e0 hai s\u1ed1 d\u01b0\u01a1ng. G\u1ecdi K l\u00e0 h\u00ecnh ph\u1eb3ng n\u1eb1m trong g\u00f3c ph\u1ea7n t\u01b0 th\u1ee9 hai \u0111\u01b0\u1ee3c gi\u1edbi h\u1ea1n b\u1edfi parabol y=ax2<\/sup>v\u00e0 \u0111\u01b0\u1eddng th\u1eb3ng y = -bx. Bi\u1ebft r\u1eb1ng th\u1ec3 t\u00edch kh\u1ed1i tr\u00f2n xoay t\u1ea1o \u0111\u01b0\u1ee3c khi quay K quanh tr\u1ee5c ho\u00e0nh l\u00e0 m\u1ed9t s\u1ed1 kh\u00f4ng ph\u1ee5 thu\u1ed9c v\u00e0o gi\u00e1 tr\u1ecb c\u1ee7a a, b. khi \u0111\u00f3 a v\u00e0 b th\u1ecfa m\u00e3n \u0111i\u1ec1u ki\u1ec7n sau:<\/p>\n A. b4<\/sup>=2a5<\/sup>\u00a0\u00a0\u00a0B. b3<\/sup>=2a5<\/sup>\u00a0\u00a0\u00a0C. b5<\/sup>=2a3<\/sup>\u00a0\u00a0\u00a0D. b4<\/sup>=2a2<\/sup><\/p>\n L\u1eddi gi\u1ea3i:<\/b><\/p>\n <\/p>\n <\/p>\n \u0110\u1ec3 gi\u00e1 tr\u1ecb n\u00e0y kh\u00f4ng ph\u1ee5 thu\u1ed9c v\u00e0o a, b th\u00ec t\u1ec9 s\u1ed1 b5<\/sup>\/a3<\/sup>\u00a0ph\u1ea3i l\u00e0 1 h\u1eb1ng s\u1ed1. trong 4 kh\u1eb3ng \u0111\u1ecbnh a, B, C , D ch\u1ec9 kh\u1eb3ng \u0111\u1ecbnh C.<\/p>\n b5<\/sup>=2a3<\/sup>\u00a0<=> b5<\/sup>\/a3<\/sup>\u00a0=2 l\u00e0 th\u1ecfa m\u00e3n. V\u1eady kh\u1eb3ng \u0111\u1ecbnh \u0111\u00fang l\u00e0 C.<\/p>\n<\/div>\n<\/div>\n B\u00e0i 60 (trang 178 sgk Gi\u1ea3i T\u00edch 12 n\u00e2ng cao) A. 9 \u00a0\u00a0\u00a0 B. 3\u00a0\u00a0\u00a0C. 81 \u00a0\u00a0\u00a0D. 8 L\u1eddi gi\u1ea3i: V\u1eady kh\u1eb3ng \u0111\u1ecbnh \u0111\u00fang l\u00e0 B. B\u00e0i 61 (trang 178 sgk Gi\u1ea3i T\u00edch 12 n\u00e2ng cao): A. e4 \u00a0\u00a0\u00a0 B. e4-1 \u00a0\u00a0\u00a0C. 4e4 \u00a0\u00a0\u00a0 D. 3e4-1 L\u1eddi gi\u1ea3i: B\u00e0i 62 (trang 178 sgk Gi\u1ea3i T\u00edch […]<\/p>\n","protected":false},"author":3,"featured_media":22998,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_mi_skip_tracking":false,"tdm_status":"","tdm_grid_status":""},"categories":[1302],"tags":[1392,1393],"yoast_head":"\n