B\u00e0i 1 - L\u00fd thuy\u1ebft B\u00e0i 1: S\u1ed1 ph\u1ee9c<\/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\/bai-1-ly-thuyet-bai-1-so-phuc\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"B\u00e0i 1 - L\u00fd thuy\u1ebft B\u00e0i 1: S\u1ed1 ph\u1ee9c\" \/>\n<meta property=\"og:description\" content=\"1. Ph\u00e2\u0300n th\u01b0\u0323c va\u0300 ph\u00e2\u0300n a\u0309o cu\u0309a s\u00f4\u0301 ph\u01b0\u0301c, s\u00f4\u0301 ph\u01b0\u0301c li\u00ean h\u01a1\u0323p Cho s\u00f4\u0301 ph\u01b0\u0301c z = a + bi (a, b \u2208 R, i2\u00a0= -1) . Khi \u0111o\u0301: + Ph\u00e2\u0300n th\u01b0\u0323c cu\u0309a z la\u0300 a, ph\u00e2\u0300n a\u0309o cu\u0309a z la\u0300 b. Khi ph\u00e2\u0300n a\u0309o b = 0 thi\u0300 z go\u0323i la\u0300 s\u00f4\u0301 thu\u00e2\u0300n […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/lop12.edu.vn\/bai-1-ly-thuyet-bai-1-so-phuc\/\" \/>\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=\"2018-04-16T04:28:13+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/lop12.edu.vn\/wp-content\/uploads\/2018\/04\/1-192.png\" \/>\n\t<meta property=\"og:image:width\" content=\"152\" \/>\n\t<meta property=\"og:image:height\" content=\"62\" \/>\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\/bai-1-ly-thuyet-bai-1-so-phuc\/\",\"url\":\"https:\/\/lop12.edu.vn\/bai-1-ly-thuyet-bai-1-so-phuc\/\",\"name\":\"B\u00e0i 1 - L\u00fd thuy\u1ebft B\u00e0i 1: S\u1ed1 ph\u1ee9c\",\"isPartOf\":{\"@id\":\"https:\/\/lop12.edu.vn\/#website\"},\"datePublished\":\"2018-04-16T04:28:13+00:00\",\"dateModified\":\"2018-04-16T04:28:13+00:00\",\"author\":{\"@id\":\"https:\/\/lop12.edu.vn\/#\/schema\/person\/2da855e5d06b553ac0065157cc261a45\"},\"breadcrumb\":{\"@id\":\"https:\/\/lop12.edu.vn\/bai-1-ly-thuyet-bai-1-so-phuc\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/lop12.edu.vn\/bai-1-ly-thuyet-bai-1-so-phuc\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/lop12.edu.vn\/bai-1-ly-thuyet-bai-1-so-phuc\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/lop12.edu.vn\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"B\u00e0i 1 – L\u00fd thuy\u1ebft B\u00e0i 1: S\u1ed1 ph\u1ee9c\"}]},{\"@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":"B\u00e0i 1 - L\u00fd thuy\u1ebft B\u00e0i 1: S\u1ed1 ph\u1ee9c","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\/bai-1-ly-thuyet-bai-1-so-phuc\/","og_locale":"en_US","og_type":"article","og_title":"B\u00e0i 1 - L\u00fd thuy\u1ebft B\u00e0i 1: S\u1ed1 ph\u1ee9c","og_description":"1. Ph\u00e2\u0300n th\u01b0\u0323c va\u0300 ph\u00e2\u0300n a\u0309o cu\u0309a s\u00f4\u0301 ph\u01b0\u0301c, s\u00f4\u0301 ph\u01b0\u0301c li\u00ean h\u01a1\u0323p Cho s\u00f4\u0301 ph\u01b0\u0301c z = a + bi (a, b \u2208 R, i2\u00a0= -1) . Khi \u0111o\u0301: + Ph\u00e2\u0300n th\u01b0\u0323c cu\u0309a z la\u0300 a, ph\u00e2\u0300n a\u0309o cu\u0309a z la\u0300 b. Khi ph\u00e2\u0300n a\u0309o b = 0 thi\u0300 z go\u0323i la\u0300 s\u00f4\u0301 thu\u00e2\u0300n […]","og_url":"https:\/\/lop12.edu.vn\/bai-1-ly-thuyet-bai-1-so-phuc\/","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":"2018-04-16T04:28:13+00:00","og_image":[{"width":152,"height":62,"url":"https:\/\/lop12.edu.vn\/wp-content\/uploads\/2018\/04\/1-192.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\/bai-1-ly-thuyet-bai-1-so-phuc\/","url":"https:\/\/lop12.edu.vn\/bai-1-ly-thuyet-bai-1-so-phuc\/","name":"B\u00e0i 1 - L\u00fd thuy\u1ebft B\u00e0i 1: S\u1ed1 ph\u1ee9c","isPartOf":{"@id":"https:\/\/lop12.edu.vn\/#website"},"datePublished":"2018-04-16T04:28:13+00:00","dateModified":"2018-04-16T04:28:13+00:00","author":{"@id":"https:\/\/lop12.edu.vn\/#\/schema\/person\/2da855e5d06b553ac0065157cc261a45"},"breadcrumb":{"@id":"https:\/\/lop12.edu.vn\/bai-1-ly-thuyet-bai-1-so-phuc\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/lop12.edu.vn\/bai-1-ly-thuyet-bai-1-so-phuc\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/lop12.edu.vn\/bai-1-ly-thuyet-bai-1-so-phuc\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/lop12.edu.vn\/"},{"@type":"ListItem","position":2,"name":"B\u00e0i 1 – L\u00fd thuy\u1ebft B\u00e0i 1: S\u1ed1 ph\u1ee9c"}]},{"@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\/26846"}],"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=26846"}],"version-history":[{"count":1,"href":"https:\/\/lop12.edu.vn\/wp-json\/wp\/v2\/posts\/26846\/revisions"}],"predecessor-version":[{"id":26849,"href":"https:\/\/lop12.edu.vn\/wp-json\/wp\/v2\/posts\/26846\/revisions\/26849"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/lop12.edu.vn\/wp-json\/wp\/v2\/media\/26847"}],"wp:attachment":[{"href":"https:\/\/lop12.edu.vn\/wp-json\/wp\/v2\/media?parent=26846"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lop12.edu.vn\/wp-json\/wp\/v2\/categories?post=26846"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lop12.edu.vn\/wp-json\/wp\/v2\/tags?post=26846"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}

{"id":26846,"date":"2018-04-16T11:28:13","date_gmt":"2018-04-16T04:28:13","guid":{"rendered":"https:\/\/lop12.edu.vn\/?p=26846"},"modified":"2018-04-16T11:28:13","modified_gmt":"2018-04-16T04:28:13","slug":"bai-1-ly-thuyet-bai-1-so-phuc","status":"publish","type":"post","link":"https:\/\/lop12.edu.vn\/bai-1-ly-thuyet-bai-1-so-phuc\/","title":{"rendered":"B\u00e0i 1 – L\u00fd thuy\u1ebft B\u00e0i 1: S\u1ed1 ph\u1ee9c"},"content":{"rendered":"

1. Ph\u00e2\u0300n th\u01b0\u0323c va\u0300 ph\u00e2\u0300n a\u0309o cu\u0309a s\u00f4\u0301 ph\u01b0\u0301c, s\u00f4\u0301 ph\u01b0\u0301c li\u00ean h\u01a1\u0323p<\/b><\/p>\n

Cho s\u00f4\u0301 ph\u01b0\u0301c z = a + bi (a, b \u2208 R, i^{2<\/sup>\u00a0= -1) . Khi \u0111o\u0301:<\/p>\n}

+ Ph\u00e2\u0300n th\u01b0\u0323c cu\u0309a z la\u0300 a, ph\u00e2\u0300n a\u0309o cu\u0309a z la\u0300 b. Khi ph\u00e2\u0300n a\u0309o b = 0 thi\u0300 z go\u0323i la\u0300 s\u00f4\u0301 thu\u00e2\u0300n a\u0309o.<\/p>\n

+ S\u00f4\u0301 ph\u01b0\u0301c li\u00ean h\u01a1\u0323p cu\u0309a z la\u0300\u00a0z\u2212<\/i>\u00a0= a – bi<\/p>\n

2. S\u00f4\u0301 ph\u01b0\u0301c b\u0103\u0300ng nhau<\/b><\/p>\n

Cho hai s\u00f4\u0301 ph\u01b0\u0301c z_{1<\/sub>\u00a0= a_{1<\/sub>\u00a0+ b_{1<\/sub>i, z_{2<\/sub>\u00a0= a_{2<\/sub>\u00a0+ b_{2<\/sub>i (a_{1<\/sub>, a_{2<\/sub>, b_{1<\/sub>, b_{2<\/sub>\u00a0\u2208 R) . Khi \u0111o\u0301:<\/p>\n}}}}}}}}}}

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

3. Bi\u00ea\u0309u di\u00ea\u0303n hi\u0300nh ho\u0323c cu\u0309a s\u00f4\u0301 ph\u01b0\u0301c<\/b><\/p>\n

S\u00f4\u0301 ph\u01b0\u0301c z = a + bi (a, b \u2208 R) \u0111\u01b0\u01a1\u0323c bi\u00ea\u0309u di\u00ea\u0303n b\u01a1\u0309i \u0111i\u00ea\u0309m M (a; b) trong m\u0103\u0323t ph\u0103\u0309ng to\u0323a \u0111\u00f4\u0323.<\/p>\n

M\u00f4\u0111un cu\u0309a z la\u0300<\/p>\n

$\"B\u00e0i$ $\"\"$ <\/p>\n","protected":false},"excerpt":{"rendered":"

1. Ph\u00e2\u0300n th\u01b0\u0323c va\u0300 ph\u00e2\u0300n a\u0309o cu\u0309a s\u00f4\u0301 ph\u01b0\u0301c, s\u00f4\u0301 ph\u01b0\u0301c li\u00ean h\u01a1\u0323p Cho s\u00f4\u0301 ph\u01b0\u0301c z = a + bi (a, b \u2208 R, i2\u00a0= -1) . Khi \u0111o\u0301: + Ph\u00e2\u0300n th\u01b0\u0323c cu\u0309a z la\u0300 a, ph\u00e2\u0300n a\u0309o cu\u0309a z la\u0300 b. Khi ph\u00e2\u0300n a\u0309o b = 0 thi\u0300 z go\u0323i la\u0300 s\u00f4\u0301 thu\u00e2\u0300n […]<\/p>\n","protected":false},"author":3,"featured_media":26847,"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":"\nB\u00e0i 1 - L\u00fd thuy\u1ebft B\u00e0i 1: S\u1ed1 ph\u1ee9c<\/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\/bai-1-ly-thuyet-bai-1-so-phuc\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"B\u00e0i 1 - L\u00fd thuy\u1ebft B\u00e0i 1: S\u1ed1 ph\u1ee9c\" \/>\n<meta property=\"og:description\" content=\"1. Ph\u00e2\u0300n th\u01b0\u0323c va\u0300 ph\u00e2\u0300n a\u0309o cu\u0309a s\u00f4\u0301 ph\u01b0\u0301c, s\u00f4\u0301 ph\u01b0\u0301c li\u00ean h\u01a1\u0323p Cho s\u00f4\u0301 ph\u01b0\u0301c z = a + bi (a, b \u2208 R, i2\u00a0= -1) . Khi \u0111o\u0301: + Ph\u00e2\u0300n th\u01b0\u0323c cu\u0309a z la\u0300 a, ph\u00e2\u0300n a\u0309o cu\u0309a z la\u0300 b. Khi ph\u00e2\u0300n a\u0309o b = 0 thi\u0300 z go\u0323i la\u0300 s\u00f4\u0301 thu\u00e2\u0300n […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/lop12.edu.vn\/bai-1-ly-thuyet-bai-1-so-phuc\/\" \/>\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=\"2018-04-16T04:28:13+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/lop12.edu.vn\/wp-content\/uploads\/2018\/04\/1-192.png\" \/>\n\t<meta property=\"og:image:width\" content=\"152\" \/>\n\t<meta property=\"og:image:height\" content=\"62\" \/>\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\/bai-1-ly-thuyet-bai-1-so-phuc\/\",\"url\":\"https:\/\/lop12.edu.vn\/bai-1-ly-thuyet-bai-1-so-phuc\/\",\"name\":\"B\u00e0i 1 - L\u00fd thuy\u1ebft B\u00e0i 1: S\u1ed1 ph\u1ee9c\",\"isPartOf\":{\"@id\":\"https:\/\/lop12.edu.vn\/#website\"},\"datePublished\":\"2018-04-16T04:28:13+00:00\",\"dateModified\":\"2018-04-16T04:28:13+00:00\",\"author\":{\"@id\":\"https:\/\/lop12.edu.vn\/#\/schema\/person\/2da855e5d06b553ac0065157cc261a45\"},\"breadcrumb\":{\"@id\":\"https:\/\/lop12.edu.vn\/bai-1-ly-thuyet-bai-1-so-phuc\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/lop12.edu.vn\/bai-1-ly-thuyet-bai-1-so-phuc\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/lop12.edu.vn\/bai-1-ly-thuyet-bai-1-so-phuc\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/lop12.edu.vn\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"B\u00e0i 1 – L\u00fd thuy\u1ebft B\u00e0i 1: S\u1ed1 ph\u1ee9c\"}]},{\"@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":"B\u00e0i 1 - L\u00fd thuy\u1ebft B\u00e0i 1: S\u1ed1 ph\u1ee9c","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\/bai-1-ly-thuyet-bai-1-so-phuc\/","og_locale":"en_US","og_type":"article","og_title":"B\u00e0i 1 - L\u00fd thuy\u1ebft B\u00e0i 1: S\u1ed1 ph\u1ee9c","og_description":"1. Ph\u00e2\u0300n th\u01b0\u0323c va\u0300 ph\u00e2\u0300n a\u0309o cu\u0309a s\u00f4\u0301 ph\u01b0\u0301c, s\u00f4\u0301 ph\u01b0\u0301c li\u00ean h\u01a1\u0323p Cho s\u00f4\u0301 ph\u01b0\u0301c z = a + bi (a, b \u2208 R, i2\u00a0= -1) . Khi \u0111o\u0301: + Ph\u00e2\u0300n th\u01b0\u0323c cu\u0309a z la\u0300 a, ph\u00e2\u0300n a\u0309o cu\u0309a z la\u0300 b. 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