B\u00e0i 1 (trang 144 SGK Gi\u1ea3i t\u00edch 12):\u00a0S\u1ed1 n\u00e0o trong c\u00e1c s\u1ed1 sau l\u00e0 s\u1ed1 th\u1ef1c?<\/strong><\/span><\/p>\n <\/p>\n L\u1eddi gi\u1ea3i<\/strong><\/p>\n Ch\u1ecdn \u0111\u00e1p \u00e1n B<\/p>\n <\/p>\n B\u00e0i 2 (trang 144 SGK Gi\u1ea3i t\u00edch 12):\u00a0S\u1ed1 n\u00e0o trong c\u00e1c s\u1ed1 sau l\u00e0 s\u1ed1 \u1ea3o?<\/strong><\/span><\/p>\n <\/p>\n L\u1eddi gi\u1ea3i<\/strong><\/p>\n Ch\u1ecdn \u0111\u00e1p \u00e1n C<\/p>\n <\/p>\n B\u00e0i 3 (trang 144 SGK Gi\u1ea3i t\u00edch 12):\u00a0\u0110\u1eb3ng th\u1ee9c n\u00e0o sau \u0111\u00e2y l\u00e0 \u0111\u1eb3ng th\u1ee9c \u0111\u00fang?<\/strong><\/span><\/p>\n (A). i1977<\/sup>=-1<\/strong><\/span><\/p>\n (B). i2345<\/sup>=i<\/strong><\/span><\/p>\n (C). i2005<\/sup>=1<\/strong><\/span><\/p>\n (D). i2006<\/sup>=-i<\/strong><\/span><\/p>\n L\u1eddi gi\u1ea3i:<\/b><\/p>\n Ch\u1ecdn \u0111\u00e1p \u00e1n B.<\/p>\n Ta c\u00f3: i(4k+r)<\/sup>=ir<\/sup>\u00a0(v\u1edbi k, r \u2208 N)<\/p>\n 2345=4k+1=>i2345<\/sup>=i<\/p>\n B\u00e0i 4 (trang 144 SGK Gi\u1ea3i t\u00edch 12):\u00a0\u0110\u1eb3ng th\u1ee9c n\u00e0o trong c\u00e1c \u0111\u1eb3ng th\u1ee9c sau l\u00e0 \u0111\u00fang?<\/strong><\/span><\/p>\n (A). (1-i)8<\/sup>=-16<\/strong><\/span><\/p>\n (B). (1+i)8<\/sup>=16i<\/strong><\/span><\/p>\n (C). (1+i)8<\/sup>=16<\/strong><\/span><\/p>\n (D). (1+i)8<\/sup>=-16i<\/strong><\/span><\/p>\n L\u1eddi gi\u1ea3i:<\/b><\/p>\n Ch\u1ecdn \u0111\u00e1p \u00e1n B.<\/p>\n Ta c\u00f3: (1+i)8<\/sup>=[(1+i)2<\/sup>\u00a0]4<\/sup>=(2i)4<\/sup>=24<\/sup>\u00a0i4<\/sup>=24<\/sup>=16<\/p>\n B\u00e0i 5 (trang 144 SGK Gi\u1ea3i t\u00edch 12):\u00a0Bi\u1ebft ngh\u1ecbch \u0111\u1ea3o c\u1ee7a s\u1ed1 ph\u1ee9c z b\u1eb1ng s\u1ed1 ph\u1ee9c li\u00ean h\u1ee3p c\u1ee7a n\u00f3, trong c\u00e1c k\u1ebft lu\u1eadn sau, k\u1ebft lu\u1eadn n\u00e0o l\u00e0 \u0111\u00fang?<\/strong><\/span><\/p>\n (A). z \u2208 R<\/strong><\/span><\/p>\n (B). |z| = 1<\/strong><\/span><\/p>\n (C). z l\u00e0 s\u1ed1 thu\u1ea7n \u1ea3o<\/strong><\/span><\/p>\n (D). |z| = -1<\/strong><\/span><\/p>\n L\u1eddi gi\u1ea3i:<\/b><\/p>\n <\/p>\n B\u00e0i 6 (trang 144 SGK Gi\u1ea3i t\u00edch 12):\u00a0Trong c\u00e1c k\u1ebft lu\u1eadn sau, k\u1ebft lu\u1eadn n\u00e0o l\u00e0 sai?<\/strong><\/span><\/p>\n A. M\u00f4 \u0111un c\u1ee7a s\u1ed1 ph\u1ee9c z l\u00e0 m\u1ed9t s\u1ed1 th\u1ef1c<\/strong><\/span><\/p>\n B. M\u00f4 \u0111un c\u1ee7a s\u1ed1 ph\u1ee9c z l\u00e0 m\u1ed9t s\u1ed1 ph\u1ee9c<\/strong><\/span><\/p>\n C. M\u00f4 \u0111un c\u1ee7a s\u1ed1 ph\u1ee9c z l\u00e0 m\u1ed9t s\u1ed1 th\u1ef1c d\u01b0\u01a1ng<\/strong><\/span><\/p>\n D. M\u00f4 \u0111un c\u1ee7a s\u1ed1 ph\u1ee9c z l\u00e0 m\u1ed9t s\u1ed1 th\u1ef1c kh\u00f4ng \u00e2m.<\/strong><\/span><\/p>\n L\u1eddi gi\u1ea3i:<\/b><\/p>\n Ch\u1ecdn \u0111\u00e1p \u00e1n C.<\/p>\n Gi\u1ea3 s\u1eed cho s\u1ed1 ph\u1ee9c z = a + bi, m\u00f4 \u0111un c\u1ee7a z l\u00e0 |z|=\u221a(a2<\/sup>+b2<\/sup>)\u22650<\/p>\n S\u1ed1 0 l\u00e0 s\u1ed1 ph\u1ee9c c\u00f3 m\u00f4 \u0111un b\u1eb1ng 0.|0+0i|=0<\/p>\n <\/p>\n","protected":false},"excerpt":{"rendered":" B\u00e0i 1 (trang 144 SGK Gi\u1ea3i t\u00edch 12):\u00a0S\u1ed1 n\u00e0o trong c\u00e1c s\u1ed1 sau l\u00e0 s\u1ed1 th\u1ef1c? L\u1eddi gi\u1ea3i Ch\u1ecdn \u0111\u00e1p \u00e1n B B\u00e0i 2 (trang 144 SGK Gi\u1ea3i t\u00edch 12):\u00a0S\u1ed1 n\u00e0o trong c\u00e1c s\u1ed1 sau l\u00e0 s\u1ed1 \u1ea3o? L\u1eddi gi\u1ea3i Ch\u1ecdn \u0111\u00e1p \u00e1n C B\u00e0i 3 (trang 144 SGK Gi\u1ea3i t\u00edch 12):\u00a0\u0110\u1eb3ng th\u1ee9c n\u00e0o sau […]<\/p>\n","protected":false},"author":3,"featured_media":20953,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_mi_skip_tracking":false,"tdm_status":"","tdm_grid_status":""},"categories":[1298],"tags":[1377,1356,1355],"yoast_head":"\n