B\u00e0i 1 (trang 80 SGK H\u00ecnh h\u1ecdc 12):\u00a0Vi\u1ebft ph\u01b0\u01a1ng tr\u00ecnh m\u1eb7t ph\u1eb3ng:<\/strong><\/span><\/p>\n <\/p>\n L\u1eddi gi\u1ea3i<\/strong><\/p>\n <\/p>\n B\u00e0i 2 (trang 80 SGK H\u00ecnh h\u1ecdc 12):\u00a0Vi\u1ebft ph\u01b0\u01a1ng tr\u00ecnh m\u1eb7t ph\u1eb3ng trung tr\u1ef1c c\u1ee7a \u0111o\u1ea1n th\u1eb3ng AB v\u1edbi A(2; 3; 7), B(4; 1; 3)<\/strong><\/span><\/p>\n L\u1eddi gi\u1ea3i:<\/b><\/p>\n <\/p>\n B\u00e0i 3 (trang 80 SGK H\u00ecnh h\u1ecdc 12):<\/strong><\/span><\/p>\n a) L\u1eadp ph\u01b0\u01a1ng tr\u00ecnh c\u1ee7a c\u00e1c m\u1eb7t ph\u1eb3ng t\u1ecda \u0111\u1ed9 Oxy, Oyz v\u00e0 Ozx<\/strong><\/span><\/p>\n b) L\u1eadp ph\u01b0\u01a1ng tr\u00ecnh c\u1ee7a c\u00e1c m\u1eb7t ph\u1eb3ng \u0111i qua \u0111i\u1ec3m M(2; 6; -3) v\u00e0 l\u1ea7n l\u01b0\u1ee3t song song v\u1edbi c\u00e1c m\u1eb7t ph\u1eb3ng t\u1ecda \u0111\u1ed9.<\/strong><\/span><\/p>\n L\u1eddi gi\u1ea3i:<\/b><\/p>\n <\/p>\n B\u00e0i 4 (trang 80 SGK H\u00ecnh h\u1ecdc 12):\u00a0L\u1eadp ph\u01b0\u01a1ng tr\u00ecnh m\u1eb7t ph\u1eb3ng:<\/strong><\/span><\/p>\n a)Ch\u1ee9a tr\u1ee5c Ox v\u00e0 \u0111i\u1ec3m P(4; -1; 2)<\/strong><\/span><\/p>\n b)Ch\u1ee9a tr\u1ee5c Oy v\u00e0 \u0111i\u1ec3m Q(1; 4; -3)<\/strong><\/span><\/p>\n c)Ch\u1ee9a tr\u1ee5c Oz v\u00e0 \u0111i\u1ec3m R(3; -4; 7)<\/strong><\/span><\/p>\n L\u1eddi gi\u1ea3i:<\/b><\/p>\n <\/p>\n B\u00e0i 5 (trang 80 SGK H\u00ecnh h\u1ecdc 12):\u00a0Cho t\u1ee9 di\u1ec7n c\u00f3 c\u00e1c \u0111\u1ec9nh l\u00e0 A(5; 1; 3), B(1; 6; 2), C(5; 0; 4), D(4; 0; 6)<\/strong><\/span><\/p>\n a)H\u00e3y vi\u1ebft ph\u01b0\u01a1ng tr\u00ecnh c\u1ee7a c\u00e1c m\u1eb7t ph\u1eb3ng (ACD) v\u00e0 (BCD)<\/strong><\/span><\/p>\n b)H\u00e3y vi\u1ebft ph\u01b0\u01a1ng tr\u00ecnh m\u1eb7t ph\u1eb3ng (\u03b1) \u0111i qua c\u1ea1nh AB v\u00e0 song song v\u1edbi c\u1ea1nh CD.<\/strong><\/span><\/p>\n L\u1eddi gi\u1ea3i:<\/b><\/p>\n <\/p>\n B\u00e0i 6 (trang 80 SGK H\u00ecnh h\u1ecdc 12):\u00a0H\u00e3y vi\u1ebft ph\u01b0\u01a1ng tr\u00ecnh m\u1eb7t ph\u1eb3ng (\u03b1) \u0111i qua \u0111i\u1ec3m M(2; -1; 2) v\u00e0 song song v\u1edbi m\u1eb7t ph\u1eb3ng (\u03b2) : 2x \u2013 y + 3z + 4 = 0<\/strong><\/span><\/p>\n L\u1eddi gi\u1ea3i:<\/b><\/p>\n V\u00ec m\u1eb7t ph\u1eb3ng (\u03b1) song song v\u1edbi m\u1eb7t ph\u1eb3ng ( \u03b2) : 2x \u2013 y + 3z + 4 = 0 n\u00ean ph\u01b0\u01a1ng tr\u00ecnh c\u1ee7a mp(\u03b1) c\u00f3 d\u1ea1ng 2x \u2013 y + 3z + D = 0<\/p>\n V\u00ec M(2; -1; 2) \u2208 mp(\u03b1) n\u00ean 4 + 1 + 6 + D = 0 <=> D = -11<\/p>\n V\u1eady ph\u01b0\u01a1ng tr\u00ecnh c\u1ee7a mp(\u03b1) l\u00e0: 2x \u2013 y + 3z – 11= 0<\/p>\n B\u00e0i 7 (trang 80 SGK H\u00ecnh h\u1ecdc 12):\u00a0L\u1eadp ph\u01b0\u01a1ng tr\u00ecnh m\u1eb7t ph\u1eb3ng (\u03b1) qua hai \u0111i\u1ec3m A(1; 0; 1), B(5; 2; 3) v\u00e0 vu\u00f4ng g\u00f3c v\u1edbi m\u1eb7t ph\u1eb3ng ( \u03b2) : 2x \u2013 y + z \u2013 7 = 0<\/strong><\/span><\/p>\n L\u1eddi gi\u1ea3i:<\/b><\/p>\n B\u00e0i 8(trang 81 SGK H\u00ecnh h\u1ecdc 12):\u00a0X\u00e1c \u0111\u1ecbnh c\u00e1c gi\u00e1 tr\u1ecb c\u1ee7a m v\u00e0 n \u0111\u1ec3 m\u1ed7i c\u1eb7p m\u1eb7t ph\u1eb3ng sau \u0111\u00e2y l\u00e0 m\u1ed9t c\u1eb7p m\u1eb7t ph\u1eb3ng song song v\u1edbi nhau;<\/strong><\/span><\/p>\n a)2x + my + 3z \u2013 5 = 0 v\u00e0 nx \u2013 8y \u2013 6z + 2 =0<\/strong><\/span><\/p>\n b)3x \u2013 5y + mz \u2013 3 = 0 v\u00e0 2x + ny \u2013 3z + 1 = 0<\/strong><\/span><\/p>\n L\u1eddi gi\u1ea3i:<\/b><\/p>\n <\/p>\n B\u00e0i 9 (trang 81 SGK H\u00ecnh h\u1ecdc 12):\u00a0T\u00ednh kho\u1ea3ng c\u00e1ch t\u1eeb \u0111i\u1ec3m A(2; 4; -3) l\u1ea7n l\u01b0\u1ee3t \u0111\u1ebfn c\u00e1c m\u1eb7t ph\u1eb3ng sau:<\/strong>a) 2x \u2013 y + 2z \u2013 9 = 0 (\u03b1)<\/strong>b) 12x \u2013 5z + 5 = 0 ( \u03b2)<\/strong>c) x = 0 ( \u03b3;)<\/strong><\/span><\/p>\n L\u1eddi gi\u1ea3i<\/b><\/p>\n <\/p>\n B\u00e0i 10 (trang 81 SGK H\u00ecnh h\u1ecdc 12):\u00a0gi\u1ea3i b\u00e0i to\u00e1n sau \u0111\u00e2y b\u1eb1ng ph\u01b0\u01a1ng ph\u00e1p t\u1ecda \u0111\u1ed9:<\/strong><\/span><\/p>\n Cho h\u00ecnh l\u1eadp ph\u01b0\u01a1ng ABCD.A’B’C’D’ c\u00f3 c\u1ea1nh b\u1eb1ng 1.<\/strong><\/span><\/p>\n a)Ch\u1ee9ng minh hai m\u1eb7t ph\u1eb3ng (AB’D’) v\u00e0 (BC’D) song song.<\/strong><\/span><\/p>\n b)T\u00ednh kho\u1ea3ng c\u00e1ch gi\u1eefa hai m\u1eb7t ph\u1eb3ng n\u00f3i tr\u00ean.<\/strong><\/span><\/p>\n L\u1eddi gi\u1ea3i:<\/b><\/p>\n <\/p>\n <\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":" B\u00e0i 1 (trang 80 SGK H\u00ecnh h\u1ecdc 12):\u00a0Vi\u1ebft ph\u01b0\u01a1ng tr\u00ecnh m\u1eb7t ph\u1eb3ng: L\u1eddi gi\u1ea3i B\u00e0i 2 (trang 80 SGK H\u00ecnh h\u1ecdc 12):\u00a0Vi\u1ebft ph\u01b0\u01a1ng tr\u00ecnh m\u1eb7t ph\u1eb3ng trung tr\u1ef1c c\u1ee7a \u0111o\u1ea1n th\u1eb3ng AB v\u1edbi A(2; 3; 7), B(4; 1; 3) L\u1eddi gi\u1ea3i: B\u00e0i 3 (trang 80 SGK H\u00ecnh h\u1ecdc 12): a) L\u1eadp ph\u01b0\u01a1ng tr\u00ecnh c\u1ee7a c\u00e1c […]<\/p>\n","protected":false},"author":3,"featured_media":20368,"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