Gi\u1ea3i t\u00edch - Ch\u01b0\u01a1ng 4 - B\u00e0i 4: Ph\u01b0\u01a1ng tr\u00ecnh b\u1eadc hai v\u1edbi h\u1ec7 s\u1ed1 th\u1ef1c<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/lop12.edu.vn\/giai-tich-chuong-4-bai-4-phuong-trinh-bac-hai-voi-thuc\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Gi\u1ea3i t\u00edch - Ch\u01b0\u01a1ng 4 - B\u00e0i 4: Ph\u01b0\u01a1ng tr\u00ecnh b\u1eadc hai v\u1edbi h\u1ec7 s\u1ed1 th\u1ef1c\" \/>\n<meta property=\"og:description\" content=\"B\u00e0i 1 (trang 140 SGK Gi\u1ea3i t\u00edch 12):\u00a0T\u00ecm c\u00e1c c\u0103n b\u1eadc hai ph\u1ee9c c\u1ee7a c\u00e1c s\u1ed1 sau: -7;-8;-12;-20;-121 L\u1eddi gi\u1ea3i: C\u0103n b\u1eadc hai c\u1ee7a -7 l\u00e0 \u00b1i \u221a7 -8 l\u00e0\u00b1i 2\u221a2 -12 l\u00e0\u00b1i2 \u221a3 -20 l\u00e0\u00b1i 2 \u221a5 -121 l\u00e0\u00b111i B\u00e0i 2 (trang 140 SGK Gi\u1ea3i t\u00edch 12):\u00a0Gi\u1ea3i c\u00e1c ph\u01b0\u01a1ng tr\u00ecnh sau tr\u00ean t\u1eadp h\u1ee3p […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/lop12.edu.vn\/giai-tich-chuong-4-bai-4-phuong-trinh-bac-hai-voi-thuc\/\" \/>\n<meta property=\"og:site_name\" content=\"Lop12.edu.vn - 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B\u00e0i 1 (trang 140 SGK Gi\u1ea3i t\u00edch 12):\u00a0T\u00ecm c\u00e1c c\u0103n b\u1eadc hai ph\u1ee9c c\u1ee7a c\u00e1c s\u1ed1 sau: -7;-8;-12;-20;-121<\/strong><\/span><\/p>\n

B\u00e0i 2 (trang 140 SGK Gi\u1ea3i t\u00edch 12):\u00a0Gi\u1ea3i c\u00e1c ph\u01b0\u01a1ng tr\u00ecnh sau tr\u00ean t\u1eadp h\u1ee3p s\u1ed1 ph\u1ee9c:<\/strong><\/span><\/p>\n

B\u00e0i 3 (trang 140 SGK Gi\u1ea3i t\u00edch 12):\u00a0Gi\u1ea3i c\u00e1c ph\u01b0\u01a1ng tr\u00ecnh sau tr\u00ean t\u1eadp h\u1ee3p s\u1ed1 ph\u1ee9c:<\/strong><\/span><\/p>\n

B\u00e0i 4 (trang 140 SGK Gi\u1ea3i t\u00edch 12):\u00a0Cho a, b, c \u2208R,a \u2260 0,z_{1<\/sub>\u00a0, z_{2<\/sub>\u00a0l\u00e0 hai nghi\u1ec7m ph\u00e2n bi\u1ec7t ( th\u1ef1c ho\u1eb7c ph\u1ee9c) c\u1ee7a ph\u01b0\u01a1ng tr\u00ecnh ax^{2<\/sup>+bx+c=0. H\u00e3y t\u00ednh z_{1<\/sub>+z_{2<\/sub>\u00a0v\u00e0 z_{1<\/sub>.z_{2<\/sub>\u00a0theo h\u1ec7 s\u1ed1 a, b, c.<\/strong><\/span><\/p>\n}}}}}}}

B\u00e0i 5 (trang 140 SGK Gi\u1ea3i t\u00edch 12):\u00a0Cho z = a + bi l\u00e0 m\u1ed9t s\u1ed1 ph\u1ee9c. H\u00e3y t\u00ecm ph\u01b0\u01a1ng tr\u00ecnh b\u1eadc hai v\u1edbi h\u1ec7 s\u1ed1 th\u1ef1c nh\u1eadn …<\/strong><\/span><\/p>\n

$\"\"$ <\/div>\n
L\u1eddi gi\u1ea3i<\/strong><\/div>\n
$\"\"$ <\/div>\n
<\/div>\n","protected":false},"excerpt":{"rendered":"
B\u00e0i 1 (trang 140 SGK Gi\u1ea3i t\u00edch 12):\u00a0T\u00ecm c\u00e1c c\u0103n b\u1eadc hai ph\u1ee9c c\u1ee7a c\u00e1c s\u1ed1 sau: -7;-8;-12;-20;-121 L\u1eddi gi\u1ea3i: C\u0103n b\u1eadc hai c\u1ee7a -7 l\u00e0 \u00b1i \u221a7 -8 l\u00e0\u00b1i 2\u221a2 -12 l\u00e0\u00b1i2 \u221a3 -20 l\u00e0\u00b1i 2 \u221a5 -121 l\u00e0\u00b111i B\u00e0i 2 (trang 140 SGK Gi\u1ea3i t\u00edch 12):\u00a0Gi\u1ea3i c\u00e1c ph\u01b0\u01a1ng tr\u00ecnh sau tr\u00ean t\u1eadp h\u1ee3p […]<\/p>\n","protected":false},"author":3,"featured_media":20961,"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":"\nGi\u1ea3i t\u00edch - Ch\u01b0\u01a1ng 4 - B\u00e0i 4: Ph\u01b0\u01a1ng tr\u00ecnh b\u1eadc hai v\u1edbi h\u1ec7 s\u1ed1 th\u1ef1c<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/lop12.edu.vn\/giai-tich-chuong-4-bai-4-phuong-trinh-bac-hai-voi-thuc\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Gi\u1ea3i t\u00edch - Ch\u01b0\u01a1ng 4 - B\u00e0i 4: Ph\u01b0\u01a1ng tr\u00ecnh b\u1eadc hai v\u1edbi h\u1ec7 s\u1ed1 th\u1ef1c\" \/>\n<meta property=\"og:description\" content=\"B\u00e0i 1 (trang 140 SGK Gi\u1ea3i t\u00edch 12):\u00a0T\u00ecm c\u00e1c c\u0103n b\u1eadc hai ph\u1ee9c c\u1ee7a c\u00e1c s\u1ed1 sau: -7;-8;-12;-20;-121 L\u1eddi gi\u1ea3i: C\u0103n b\u1eadc hai c\u1ee7a -7 l\u00e0 \u00b1i \u221a7 -8 l\u00e0\u00b1i 2\u221a2 -12 l\u00e0\u00b1i2 \u221a3 -20 l\u00e0\u00b1i 2 \u221a5 -121 l\u00e0\u00b111i B\u00e0i 2 (trang 140 SGK Gi\u1ea3i t\u00edch 12):\u00a0Gi\u1ea3i c\u00e1c ph\u01b0\u01a1ng tr\u00ecnh sau tr\u00ean t\u1eadp h\u1ee3p […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/lop12.edu.vn\/giai-tich-chuong-4-bai-4-phuong-trinh-bac-hai-voi-thuc\/\" \/>\n<meta property=\"og:site_name\" content=\"Lop12.edu.vn - C\u1ed9ng \u0111\u1ed3ng h\u1ecdc sinh l\u1edbp 12 l\u1edbn nh\u1ea5t t\u1ea1i Vi\u1ec7t Nam\" \/>\n<meta property=\"article:published_time\" content=\"2018-03-13T11:16:26+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2018-03-13T11:16:55+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/lop12.edu.vn\/wp-content\/uploads\/2018\/03\/bai-2-trang-140-sgk-giai-tich-12.png\" \/>\n\t<meta property=\"og:image:width\" content=\"384\" \/>\n\t<meta property=\"og:image:height\" content=\"369\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"H\u00e0 Trang\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"H\u00e0 Trang\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/lop12.edu.vn\/giai-tich-chuong-4-bai-4-phuong-trinh-bac-hai-voi-thuc\/\",\"url\":\"https:\/\/lop12.edu.vn\/giai-tich-chuong-4-bai-4-phuong-trinh-bac-hai-voi-thuc\/\",\"name\":\"Gi\u1ea3i t\u00edch - 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