{"article_info":{"article_id":144933,"cat_id":1543,"cat_title":"Vở thực hành Toán 8","publish_time":1690861380,"cat_id2":1543,"is_link":0,"thumbnail":"https://img.loigiaihay.com/picture/article/2023/0801/resize_1-0_11.png","title":"Giải bài 4 trang 14 vở thực hành Toán 8","label":"Bài 4 trang 14","alias":"giai-bai-4-trang-14-vo-thuc-hanh-toan-8","introtext":"Cho hai đa thức (A = 7xy{z^2}-5x{y^2}z + 3{x^2}yz-xyz + 1;B = 7{x^2}yz-5x{y^2}z + 3xy{z^2}-2) ","content":"<style>\r\n.method-close-icon{position: relative;float: right;top: 6px;transform: rotate(270deg);-ms-transform:rotate(270deg);-moz-transform:rotate(270deg);-webkit-transform:rotate(270deg);-o-transform:rotate(270deg);}\r\n.method-open-icon{position: relative;float: right;top: 6px;}\r\n</style>\r\n<p><strong style=\"font-size: 16px;\">Đề bài</strong></p><p>Cho hai đa thức</p>\r\n<p><span class=\"MTConvertedEquation\">\\(A = 7xy{z^2}-5x{y^2}z + 3{x^2}yz-xyz + 1;\\\\B = 7{x^2}yz-5x{y^2}z + 3xy{z^2}-2.\\)</span></p>\r\n<p>a) Tìm đa thức C sao cho<span class=\"MTConvertedEquation\"> \\(A-C = B\\) </span>.</p>\r\n<p>b) Tìm đa thức D sao cho<span class=\"MTConvertedEquation\"> \\(A + D = B\\) </span>.</p>\r\n<p>c) Tìm đa thức E sao cho<span class=\"MTConvertedEquation\"> \\(E-A = B\\) </span>. </p><div id=\"pos_end_question\"></div><div style=\"padding-top: 10px;padding-bottom: 2px;margin-bottom: 10px;\"><p class=\"show-detail-method\" style=\"background: #654bc2;text-align: center;border-radius:5px;padding: 10px;margin-bottom: 0px;\" onclick=\"showDetailMethod();\"><strong style=\"font-size: 16px;\">Phương pháp giải - Xem chi tiết</strong><img class=\"method-open-icon\" id=\"method_colapse_icon\" src=\"data:image/png;base64,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\"></p>  <div class=\"content_method_content\" style=\"padding: 10px 10px 5px 10px;border: dashed 1px #654bc2;border-top:none;\"><p>Sử dụng quy tắc cộng (trừ) hai đa thức: Muốn cộng (hay trừ) hai đa thức, ta nối hai đa thức ấy bởi dấu “+” (hay dấu “-“) rồi bỏ dấu ngoặc (nếu có) và thu gọn đa thức nhận được.</p>  </div>\r\n<script type=\"text/javascript\">\r\n    var is_open =true;\r\n    function showDetailMethod(){\r\n        if(is_open){\r\n            document.querySelector(\".content_method_content\").style.display='none';\r\n            document.getElementById(\"method_colapse_icon\").classList.remove(\"method-open-icon\");\r\n            document.getElementById(\"method_colapse_icon\").classList.add(\"method-close-icon\");\r\n        }else{\r\n            document.querySelector(\".content_method_content\").style.display='block';\r\n            document.getElementById(\"method_colapse_icon\").classList.remove(\"method-close-icon\");\r\n            document.getElementById(\"method_colapse_icon\").classList.add(\"method-open-icon\");\r\n        }\r\n        is_open = !is_open;\r\n    }\r\n</script>\r\n</div><p><strong style=\"font-size: 16px;\">Lời giải chi tiết</strong></p><p>a) <span class=\"MTConvertedEquation\">\\(A-C = B \\) suy ra \\( C = A-B\\)</span></p>\r\n<p><span class=\"MTConvertedEquation\">\\(C = \\left( {7xy{z^2}\\;-5x{y^2}z + 3{x^2}yz-xyz + 1} \\right)-\\left( {7{x^2}yz-5x{y^2}z + 3xy{z^2}\\;-2} \\right)\\)</span></p>\r\n<p><span class=\"MTConvertedEquation\">\\({C = 7xy{z^2}\\;-5x{y^2}z + 3{x^2}yz-xyz + 1-7{x^2}yz + 5x{y^2}z-3xy{z^2}\\; + 2}\\)</span></p>\r\n<p><span class=\"MTConvertedEquation\">\\({C = \\left( {7xy{z^2}\\;-3xy{z^2}} \\right) + \\left( {5x{y^2}z-5x{y^2}z} \\right) + \\left( {3{x^2}yz-7{x^2}yz} \\right)-xyz + \\left( {1 + 2} \\right)}\\)</span></p>\r\n<p><span class=\"MTConvertedEquation\">\\({C = 4xy{z^{2\\;}}-4{x^2}yz-xyz + 3.}\\)</span></p>\r\n<p>b) <span class=\"MTConvertedEquation\">\\(A + D = B \\) suy ra \\( D = B-A = -\\left( {A-B} \\right)\\;\\)</span></p>\r\n<p><span class=\"MTConvertedEquation\">suy ra \\( D = -\\left( {4xy{z^{2\\;}}-4{x^2}yz-xyz + 3} \\right)\\)</span></p>\r\n<p><span class=\"MTConvertedEquation\">\\({D = -4xy{z^{2\\;}} + 4{x^2}yz + xyz-3.}\\)</span></p>\r\n<p>c) <span class=\"MTConvertedEquation\">\\(E-A = B \\) suy ra \\( E = A + B\\)</span></p>\r\n<p><span class=\"MTConvertedEquation\">suy ra \\( E = \\left( {7xy{z^2}\\;-5x{y^2}z + 3{x^2}yz-xyz + 1} \\right) + \\left( {7{x^2}yz-5x{y^2}z + 3xy{z^2}\\;-2} \\right)\\)</span></p>\r\n<p><span class=\"MTConvertedEquation\">\\({E = 7xy{z^2}\\;-5x{y^2}z + 3{x^2}yz-xyz + 1 + 7{x^2}yz-5x{y^2}z + 3xy{z^2}\\;-2}\\)</span></p>\r\n<p><span class=\"MTConvertedEquation\">\\({E = \\left( {7xy{z^2}\\; + 3xy{z^2}} \\right)-\\left( {5x{y^2}z + 5x{y^2}z} \\right) + \\left( {7{x^2}yz + 3{x^2}yz} \\right)-xyz + \\left( {1-2} \\right)}\\)</span></p>\r\n<p><span class=\"MTConvertedEquation\">\\({E = 10{x^2}yz-10x{y^2}z + 10xy{z^2}\\;-xyz - 1.}\\) </span></p>","common_article":"","display_type":1,"vungoi_exam_id":"","article_type":1,"cmt_count":0,"zip_status":1,"last_modified_time":1727142081,"last_zip_time":1727142081,"zip_link":"https://offline.loigiaihay.com/articles/1543/144933/144933_1727142081.zip","picture":"https://img.loigiaihay.com/picture/article/2023/0801/1-0_11.png","youtube_id":"","video_start_time":"0","quizlet_id":"0","ref_article_id":0,"readmore_display_type":0,"wiki":0,"comment_url":"https://loigiaihay.com/comment/giai-bai-4-trang-14-vo-thuc-hanh-toan-8-c1543a144933.html","origin_url":"https://loigiaihay.com/giai-bai-4-trang-14-vo-thuc-hanh-toan-8-c1543a144933.html","relate_link":[],"exam_file":"","solution_file":""},"callouts":[],"relate_articles":[],"others_in_cat":[{"article_id":144935,"cat_id":1543,"publish_time":1690861620,"is_link":0,"thumbnail":"https://img.loigiaihay.com/picture/article/2023/0801/resize_1-0_12.png","title":"Giải bài 5 trang 15 vở thực hành Toán 8","alias":"giai-bai-5-trang-15-vo-thuc-hanh-toan-8","introtext":"Từ một miếng bìa, người ta cắt ra hai hình tròn có bán kính x centimét và y centimét. ","display_type":1,"article_type":1},{"article_id":144936,"cat_id":1543,"publish_time":1690861860,"is_link":0,"thumbnail":"https://img.loigiaihay.com/picture/article/2023/0801/resize_1-0_13.png","title":"Giải bài 6 trang 15 vở thực hành Toán 8","alias":"giai-bai-6-trang-15-vo-thuc-hanh-toan-8","introtext":"Cho ba đa thức: ","display_type":1,"article_type":1},{"article_id":144937,"cat_id":1543,"publish_time":1690861980,"is_link":0,"thumbnail":"https://img.loigiaihay.com/picture/article/2023/0801/resize_1-0_14.png","title":"Giải bài 7 trang 16 vở thực hành Toán 8","alias":"giai-bai-7-trang-16-vo-thuc-hanh-toan-8","introtext":"Cho hai đa thức \\(A = {x^2}{y^2} - ax{y^2} + 3{y^2} - xy + b\\) và ","display_type":1,"article_type":1},{"article_id":144932,"cat_id":1543,"publish_time":1690861260,"is_link":0,"thumbnail":"https://img.loigiaihay.com/picture/article/2023/0801/resize_1-0_10.png","title":"Giải bài 3 trang 14 vở thực hành Toán 8","alias":"giai-bai-3-trang-14-vo-thuc-hanh-toan-8","introtext":"Tìm bậc của mỗi đa thức sau rồi tính giá trị của chúng tại \\(x = 1;y = - 2\\) .","display_type":1,"article_type":1},{"article_id":144931,"cat_id":1543,"publish_time":1690861140,"is_link":0,"thumbnail":"https://img.loigiaihay.com/picture/article/2023/0801/resize_1-0_9.png","title":"Giải bài 2 trang 14 vở thực hành Toán 8","alias":"giai-bai-2-trang-14-vo-thuc-hanh-toan-8","introtext":"Trong một khách sạn có hai bể bơi dạng hình hộp chữ nhật. ","display_type":1,"article_type":1},{"article_id":144930,"cat_id":1543,"publish_time":1690860900,"is_link":0,"thumbnail":"https://img.loigiaihay.com/picture/article/2023/0801/resize_1-0_8.png","title":"Giải bài 1 trang 13 vở thực hành Toán 8","alias":"giai-bai-1-trang-13-vo-thuc-hanh-toan-8","introtext":"Cho các biểu thức:","display_type":1,"article_type":1}],"event_info":{"title":"Luyện tập chung trang 13, 14, 15 Vở thực hành Toán 8","cat_id":1543,"alias":"luyen-tap-chung-trang-13-14-15-vo-thuc-hanh-toan-8","introtext":"","type":"event","item_id":32622,"item_type":2},"banner":[],"top_banner":"","content_expanded":[],"child_events":[{"id":"32622","title":"Luyện tập chung trang 13, 14, 15 Vở thực hành Toán 8","short_title":"Luyện tập chung trang 13","alias":"luyen-tap-chung-trang-13-14-15-vo-thuc-hanh-toan-8","picture":"picture/event/2023/0731/1-0_9.png","is_link":"0","links":"","is_hot":"0","is_all":"0","category_id":"1543","ordering":"32622","parent_id":"32614"}],"parent_events":[{"id":"32614","title":"Chương I. 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