L\u00fd thuy\u1ebft 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\/ly-thuyet-bai-4-phuong-trinh-bac-hai-voi-he-so-thuc\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"L\u00fd thuy\u1ebft 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=\"1. Ca\u0301c c\u0103n b\u00e2\u0323c hai cu\u0309a s\u00f4\u0301 th\u01b0\u0323c a \u00e2m la\u0300 \u00b1i\u221a|a| 2. Cho ph\u01b0\u01a1ng tri\u0300nh b\u00e2\u0323c hai ax2\u00a0+ bx + c trong \u0111o\u0301 a, b, c la\u0300 ca\u0301c s\u00f4\u0301 th\u01b0\u0323c va\u0300 a \u2260 0. Xe\u0301t bi\u00ea\u0323t th\u01b0\u0301c \u0394 = b2\u00a0– 4ac. Ta co\u0301 ca\u0301c tr\u01b0\u01a1\u0300ng h\u01a1\u0323p: Tr\u01b0\u01a1\u0300ng h\u01a1\u0323p 1. \u0394 = 0: Khi \u0111o\u0301 […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/lop12.edu.vn\/ly-thuyet-bai-4-phuong-trinh-bac-hai-voi-he-so-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=\"2018-04-13T09:46:00+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/lop12.edu.vn\/wp-content\/uploads\/2018\/04\/1-183.png\" \/>\n\t<meta property=\"og:image:width\" content=\"66\" \/>\n\t<meta property=\"og:image:height\" content=\"56\" \/>\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\/ly-thuyet-bai-4-phuong-trinh-bac-hai-voi-he-so-thuc\/\",\"url\":\"https:\/\/lop12.edu.vn\/ly-thuyet-bai-4-phuong-trinh-bac-hai-voi-he-so-thuc\/\",\"name\":\"L\u00fd thuy\u1ebft B\u00e0i 4: Ph\u01b0\u01a1ng tr\u00ecnh b\u1eadc hai v\u1edbi h\u1ec7 s\u1ed1 th\u1ef1c\",\"isPartOf\":{\"@id\":\"https:\/\/lop12.edu.vn\/#website\"},\"datePublished\":\"2018-04-13T09:46:00+00:00\",\"dateModified\":\"2018-04-13T09:46:00+00:00\",\"author\":{\"@id\":\"https:\/\/lop12.edu.vn\/#\/schema\/person\/2da855e5d06b553ac0065157cc261a45\"},\"breadcrumb\":{\"@id\":\"https:\/\/lop12.edu.vn\/ly-thuyet-bai-4-phuong-trinh-bac-hai-voi-he-so-thuc\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/lop12.edu.vn\/ly-thuyet-bai-4-phuong-trinh-bac-hai-voi-he-so-thuc\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/lop12.edu.vn\/ly-thuyet-bai-4-phuong-trinh-bac-hai-voi-he-so-thuc\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/lop12.edu.vn\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"L\u00fd thuy\u1ebft B\u00e0i 4: Ph\u01b0\u01a1ng tr\u00ecnh b\u1eadc hai v\u1edbi h\u1ec7 s\u1ed1 th\u1ef1c\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/lop12.edu.vn\/#website\",\"url\":\"https:\/\/lop12.edu.vn\/\",\"name\":\"Lop12.edu.vn - C\u1ed9ng \u0111\u1ed3ng h\u1ecdc sinh l\u1edbp 12\",\"description\":\"\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/lop12.edu.vn\/?s={search_term_string}\"},\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"en-US\"},{\"@type\":\"Person\",\"@id\":\"https:\/\/lop12.edu.vn\/#\/schema\/person\/2da855e5d06b553ac0065157cc261a45\",\"name\":\"H\u00e0 Trang\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/lop12.edu.vn\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/secure.gravatar.com\/avatar\/545a8100db1147f314111301d261dc33?s=96&d=mm&r=g\",\"contentUrl\":\"https:\/\/secure.gravatar.com\/avatar\/545a8100db1147f314111301d261dc33?s=96&d=mm&r=g\",\"caption\":\"H\u00e0 Trang\"},\"url\":\"https:\/\/lop12.edu.vn\/author\/trangvth2\/\"}]}<\/script>\n","yoast_head_json":{"title":"L\u00fd thuy\u1ebft B\u00e0i 4: Ph\u01b0\u01a1ng tr\u00ecnh b\u1eadc hai v\u1edbi h\u1ec7 s\u1ed1 th\u1ef1c","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/lop12.edu.vn\/ly-thuyet-bai-4-phuong-trinh-bac-hai-voi-he-so-thuc\/","og_locale":"en_US","og_type":"article","og_title":"L\u00fd thuy\u1ebft B\u00e0i 4: Ph\u01b0\u01a1ng tr\u00ecnh b\u1eadc hai v\u1edbi h\u1ec7 s\u1ed1 th\u1ef1c","og_description":"1. Ca\u0301c c\u0103n b\u00e2\u0323c hai cu\u0309a s\u00f4\u0301 th\u01b0\u0323c a \u00e2m la\u0300 \u00b1i\u221a|a| 2. Cho ph\u01b0\u01a1ng tri\u0300nh b\u00e2\u0323c hai ax2\u00a0+ bx + c trong \u0111o\u0301 a, b, c la\u0300 ca\u0301c s\u00f4\u0301 th\u01b0\u0323c va\u0300 a \u2260 0. Xe\u0301t bi\u00ea\u0323t th\u01b0\u0301c \u0394 = b2\u00a0– 4ac. Ta co\u0301 ca\u0301c tr\u01b0\u01a1\u0300ng h\u01a1\u0323p: Tr\u01b0\u01a1\u0300ng h\u01a1\u0323p 1. \u0394 = 0: Khi \u0111o\u0301 […]","og_url":"https:\/\/lop12.edu.vn\/ly-thuyet-bai-4-phuong-trinh-bac-hai-voi-he-so-thuc\/","og_site_name":"Lop12.edu.vn - C\u1ed9ng \u0111\u1ed3ng h\u1ecdc sinh l\u1edbp 12 l\u1edbn nh\u1ea5t t\u1ea1i Vi\u1ec7t Nam","article_published_time":"2018-04-13T09:46:00+00:00","og_image":[{"width":66,"height":56,"url":"https:\/\/lop12.edu.vn\/wp-content\/uploads\/2018\/04\/1-183.png","type":"image\/png"}],"author":"H\u00e0 Trang","twitter_card":"summary_large_image","twitter_misc":{"Written by":"H\u00e0 Trang","Est. reading time":"1 minute"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/lop12.edu.vn\/ly-thuyet-bai-4-phuong-trinh-bac-hai-voi-he-so-thuc\/","url":"https:\/\/lop12.edu.vn\/ly-thuyet-bai-4-phuong-trinh-bac-hai-voi-he-so-thuc\/","name":"L\u00fd thuy\u1ebft B\u00e0i 4: Ph\u01b0\u01a1ng tr\u00ecnh b\u1eadc hai v\u1edbi h\u1ec7 s\u1ed1 th\u1ef1c","isPartOf":{"@id":"https:\/\/lop12.edu.vn\/#website"},"datePublished":"2018-04-13T09:46:00+00:00","dateModified":"2018-04-13T09:46:00+00:00","author":{"@id":"https:\/\/lop12.edu.vn\/#\/schema\/person\/2da855e5d06b553ac0065157cc261a45"},"breadcrumb":{"@id":"https:\/\/lop12.edu.vn\/ly-thuyet-bai-4-phuong-trinh-bac-hai-voi-he-so-thuc\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/lop12.edu.vn\/ly-thuyet-bai-4-phuong-trinh-bac-hai-voi-he-so-thuc\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/lop12.edu.vn\/ly-thuyet-bai-4-phuong-trinh-bac-hai-voi-he-so-thuc\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/lop12.edu.vn\/"},{"@type":"ListItem","position":2,"name":"L\u00fd thuy\u1ebft B\u00e0i 4: Ph\u01b0\u01a1ng tr\u00ecnh b\u1eadc hai v\u1edbi h\u1ec7 s\u1ed1 th\u1ef1c"}]},{"@type":"WebSite","@id":"https:\/\/lop12.edu.vn\/#website","url":"https:\/\/lop12.edu.vn\/","name":"Lop12.edu.vn - C\u1ed9ng \u0111\u1ed3ng h\u1ecdc sinh l\u1edbp 12","description":"","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/lop12.edu.vn\/?s={search_term_string}"},"query-input":"required name=search_term_string"}],"inLanguage":"en-US"},{"@type":"Person","@id":"https:\/\/lop12.edu.vn\/#\/schema\/person\/2da855e5d06b553ac0065157cc261a45","name":"H\u00e0 Trang","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/lop12.edu.vn\/#\/schema\/person\/image\/","url":"https:\/\/secure.gravatar.com\/avatar\/545a8100db1147f314111301d261dc33?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/545a8100db1147f314111301d261dc33?s=96&d=mm&r=g","caption":"H\u00e0 Trang"},"url":"https:\/\/lop12.edu.vn\/author\/trangvth2\/"}]}},"_links":{"self":[{"href":"https:\/\/lop12.edu.vn\/wp-json\/wp\/v2\/posts\/26710"}],"collection":[{"href":"https:\/\/lop12.edu.vn\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/lop12.edu.vn\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/lop12.edu.vn\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/lop12.edu.vn\/wp-json\/wp\/v2\/comments?post=26710"}],"version-history":[{"count":1,"href":"https:\/\/lop12.edu.vn\/wp-json\/wp\/v2\/posts\/26710\/revisions"}],"predecessor-version":[{"id":26714,"href":"https:\/\/lop12.edu.vn\/wp-json\/wp\/v2\/posts\/26710\/revisions\/26714"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/lop12.edu.vn\/wp-json\/wp\/v2\/media\/26711"}],"wp:attachment":[{"href":"https:\/\/lop12.edu.vn\/wp-json\/wp\/v2\/media?parent=26710"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lop12.edu.vn\/wp-json\/wp\/v2\/categories?post=26710"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lop12.edu.vn\/wp-json\/wp\/v2\/tags?post=26710"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}

{"id":26710,"date":"2018-04-13T16:46:00","date_gmt":"2018-04-13T09:46:00","guid":{"rendered":"https:\/\/lop12.edu.vn\/?p=26710"},"modified":"2018-04-13T16:46:00","modified_gmt":"2018-04-13T09:46:00","slug":"ly-thuyet-bai-4-phuong-trinh-bac-hai-voi-he-so-thuc","status":"publish","type":"post","link":"https:\/\/lop12.edu.vn\/ly-thuyet-bai-4-phuong-trinh-bac-hai-voi-he-so-thuc\/","title":{"rendered":"L\u00fd thuy\u1ebft B\u00e0i 4: Ph\u01b0\u01a1ng tr\u00ecnh b\u1eadc hai v\u1edbi h\u1ec7 s\u1ed1 th\u1ef1c"},"content":{"rendered":"

1. Ca\u0301c c\u0103n b\u00e2\u0323c hai cu\u0309a s\u00f4\u0301 th\u01b0\u0323c a \u00e2m la\u0300 \u00b1i\u221a|a|<\/p>\n

2. Cho ph\u01b0\u01a1ng tri\u0300nh b\u00e2\u0323c hai ax^{2<\/sup>\u00a0+ bx + c trong \u0111o\u0301 a, b, c la\u0300 ca\u0301c s\u00f4\u0301 th\u01b0\u0323c va\u0300 a \u2260 0. Xe\u0301t bi\u00ea\u0323t th\u01b0\u0301c \u0394 = b^{2<\/sup>\u00a0– 4ac. Ta co\u0301 ca\u0301c tr\u01b0\u01a1\u0300ng h\u01a1\u0323p:<\/p>\n}}

Tr\u01b0\u01a1\u0300ng h\u01a1\u0323p 1. \u0394 = 0: Khi \u0111o\u0301 ph\u01b0\u01a1ng tri\u0300nh co\u0301 nghi\u00ea\u0323m ke\u0301p:<\/p>\n

$\"\"$ <\/p>\n

Tr\u01b0\u01a1\u0300ng h\u01a1\u0323p 2. \u0394 > 0: Ph\u01b0\u01a1ng tri\u0300nh co\u0301 hai nghi\u00ea\u0323m th\u01b0\u0323c ph\u00e2n bi\u00ea\u0323t:<\/p>\n

$\"\"$ <\/p>\n

Tr\u01b0\u01a1\u0300ng h\u01a1\u0323p 3. \u0394 < 0: Ph\u01b0\u01a1ng tri\u0300nh co\u0301 hai nghi\u00ea\u0323m ph\u01b0\u0301c ph\u00e2n bi\u00ea\u0323t:<\/p>\n

$\"\"$ <\/p>\n","protected":false},"excerpt":{"rendered":"

1. Ca\u0301c c\u0103n b\u00e2\u0323c hai cu\u0309a s\u00f4\u0301 th\u01b0\u0323c a \u00e2m la\u0300 \u00b1i\u221a|a| 2. Cho ph\u01b0\u01a1ng tri\u0300nh b\u00e2\u0323c hai ax2\u00a0+ bx + c trong \u0111o\u0301 a, b, c la\u0300 ca\u0301c s\u00f4\u0301 th\u01b0\u0323c va\u0300 a \u2260 0. Xe\u0301t bi\u00ea\u0323t th\u01b0\u0301c \u0394 = b2\u00a0– 4ac. Ta co\u0301 ca\u0301c tr\u01b0\u01a1\u0300ng h\u01a1\u0323p: Tr\u01b0\u01a1\u0300ng h\u01a1\u0323p 1. \u0394 = 0: Khi \u0111o\u0301 […]<\/p>\n","protected":false},"author":3,"featured_media":26711,"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":"\nL\u00fd thuy\u1ebft 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\/ly-thuyet-bai-4-phuong-trinh-bac-hai-voi-he-so-thuc\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"L\u00fd thuy\u1ebft 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=\"1. Ca\u0301c c\u0103n b\u00e2\u0323c hai cu\u0309a s\u00f4\u0301 th\u01b0\u0323c a \u00e2m la\u0300 \u00b1i\u221a|a| 2. Cho ph\u01b0\u01a1ng tri\u0300nh b\u00e2\u0323c hai ax2\u00a0+ bx + c trong \u0111o\u0301 a, b, c la\u0300 ca\u0301c s\u00f4\u0301 th\u01b0\u0323c va\u0300 a \u2260 0. Xe\u0301t bi\u00ea\u0323t th\u01b0\u0301c \u0394 = b2\u00a0– 4ac. Ta co\u0301 ca\u0301c tr\u01b0\u01a1\u0300ng h\u01a1\u0323p: Tr\u01b0\u01a1\u0300ng h\u01a1\u0323p 1. \u0394 = 0: Khi \u0111o\u0301 […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/lop12.edu.vn\/ly-thuyet-bai-4-phuong-trinh-bac-hai-voi-he-so-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=\"2018-04-13T09:46:00+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/lop12.edu.vn\/wp-content\/uploads\/2018\/04\/1-183.png\" \/>\n\t<meta property=\"og:image:width\" content=\"66\" \/>\n\t<meta property=\"og:image:height\" content=\"56\" \/>\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\/ly-thuyet-bai-4-phuong-trinh-bac-hai-voi-he-so-thuc\/\",\"url\":\"https:\/\/lop12.edu.vn\/ly-thuyet-bai-4-phuong-trinh-bac-hai-voi-he-so-thuc\/\",\"name\":\"L\u00fd thuy\u1ebft B\u00e0i 4: Ph\u01b0\u01a1ng tr\u00ecnh b\u1eadc hai v\u1edbi h\u1ec7 s\u1ed1 th\u1ef1c\",\"isPartOf\":{\"@id\":\"https:\/\/lop12.edu.vn\/#website\"},\"datePublished\":\"2018-04-13T09:46:00+00:00\",\"dateModified\":\"2018-04-13T09:46:00+00:00\",\"author\":{\"@id\":\"https:\/\/lop12.edu.vn\/#\/schema\/person\/2da855e5d06b553ac0065157cc261a45\"},\"breadcrumb\":{\"@id\":\"https:\/\/lop12.edu.vn\/ly-thuyet-bai-4-phuong-trinh-bac-hai-voi-he-so-thuc\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/lop12.edu.vn\/ly-thuyet-bai-4-phuong-trinh-bac-hai-voi-he-so-thuc\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/lop12.edu.vn\/ly-thuyet-bai-4-phuong-trinh-bac-hai-voi-he-so-thuc\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/lop12.edu.vn\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"L\u00fd thuy\u1ebft B\u00e0i 4: Ph\u01b0\u01a1ng tr\u00ecnh b\u1eadc hai v\u1edbi h\u1ec7 s\u1ed1 th\u1ef1c\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/lop12.edu.vn\/#website\",\"url\":\"https:\/\/lop12.edu.vn\/\",\"name\":\"Lop12.edu.vn - C\u1ed9ng \u0111\u1ed3ng h\u1ecdc sinh l\u1edbp 12\",\"description\":\"\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/lop12.edu.vn\/?s={search_term_string}\"},\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"en-US\"},{\"@type\":\"Person\",\"@id\":\"https:\/\/lop12.edu.vn\/#\/schema\/person\/2da855e5d06b553ac0065157cc261a45\",\"name\":\"H\u00e0 Trang\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/lop12.edu.vn\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/secure.gravatar.com\/avatar\/545a8100db1147f314111301d261dc33?s=96&d=mm&r=g\",\"contentUrl\":\"https:\/\/secure.gravatar.com\/avatar\/545a8100db1147f314111301d261dc33?s=96&d=mm&r=g\",\"caption\":\"H\u00e0 Trang\"},\"url\":\"https:\/\/lop12.edu.vn\/author\/trangvth2\/\"}]}<\/script>\n","yoast_head_json":{"title":"L\u00fd thuy\u1ebft B\u00e0i 4: Ph\u01b0\u01a1ng tr\u00ecnh b\u1eadc hai v\u1edbi h\u1ec7 s\u1ed1 th\u1ef1c","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/lop12.edu.vn\/ly-thuyet-bai-4-phuong-trinh-bac-hai-voi-he-so-thuc\/","og_locale":"en_US","og_type":"article","og_title":"L\u00fd thuy\u1ebft B\u00e0i 4: Ph\u01b0\u01a1ng tr\u00ecnh b\u1eadc hai v\u1edbi h\u1ec7 s\u1ed1 th\u1ef1c","og_description":"1. Ca\u0301c c\u0103n b\u00e2\u0323c hai cu\u0309a s\u00f4\u0301 th\u01b0\u0323c a \u00e2m la\u0300 \u00b1i\u221a|a| 2. Cho ph\u01b0\u01a1ng tri\u0300nh b\u00e2\u0323c hai ax2\u00a0+ bx + c trong \u0111o\u0301 a, b, c la\u0300 ca\u0301c s\u00f4\u0301 th\u01b0\u0323c va\u0300 a \u2260 0. Xe\u0301t bi\u00ea\u0323t th\u01b0\u0301c \u0394 = b2\u00a0– 4ac. 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