{"event_info":{"picture":"","title":"Bài 4: Quy tắc dấu ngoặc và quy tắc chuyển vế - Chân trời sáng tạo","display_type":1,"cat_id":1005,"cat_title":"Sách bài tập Toán 7 - Chân trời sáng tạo","alias":"bai-4-quy-tac-dau-ngoac-va-quy-tac-chuyen-ve-chan-troi-sang-tao","introtext":"","content_box_above":"Giải sách bài tập toán 7 bài 4 Quy tắc dấu ngoặc và quy tắc chuyển vế trang 16 - Chân trời sáng tạo có đáp án, lời giải chi tiết kèm phương pháp giải đầy đủ tất cả các bài","type":"event","page_builder":"","item_id":26957,"item_type":2},"list_articles":[{"article_id":116510,"cat_id":1005,"publish_time":1661131860,"type_ex":0,"is_hot":0,"is_link":0,"thumbnail":"","title":"Giải Bài 1 trang 17 sách bài tập toán 7 tập 1 - Chân trời sáng tạo","label":"Bài 1 trang 17","alias":"giai-bai-1-trang-17-sach-bai-tap-toan-7-tap-1-chan-troi-sang-tao","introtext":"Bỏ ngoặc rồi tính","display_type":1,"article_type":1,"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;\">Lời giải chi tiết</strong></p><p>a) \\(\\left( {\\dfrac{{ - 3}}{8}} \\right) + \\left( {\\dfrac{7}{9} - \\dfrac{5}{8}} \\right)\\)</p>\r\n<p>\\( = \\left( {\\dfrac{{ - 3}}{8}} \\right) - \\dfrac{5}{8} + \\dfrac{7}{9} \\\\=  - 1 + \\dfrac{7}{9} \\\\= \\dfrac{{ - 9}}{9} + \\dfrac{7}{9} \\\\= \\dfrac{{ - 2}}{9}\\)</p>\r\n<p>b) \\(\\dfrac{4}{9} - \\left( {\\dfrac{3}{7} + \\dfrac{2}{9}} \\right)\\)</p>\r\n<p>\\(=\\dfrac{4}{9} - \\dfrac{3}{7} - \\dfrac{2}{9} \\\\= \\dfrac{4}{9} - \\dfrac{2}{9} - \\dfrac{3}{7} \\\\= \\dfrac{2}{9} - \\dfrac{3}{7} \\\\= \\dfrac{{14}}{{63}} - \\dfrac{{27}}{{63}} \\\\= \\dfrac{{ - 13}}{{63}}\\)</p>\r\n<p>c)\\(\\left[ {\\left( {\\dfrac{{ - 2}}{5}} \\right) + \\dfrac{1}{3}} \\right] - \\left( {\\dfrac{3}{5} - \\dfrac{1}{4}} \\right)\\)</p>\r\n<p>\\(\\begin{array}{l} = \\left( {\\dfrac{{ - 2}}{5}} \\right) + \\dfrac{1}{3} - \\dfrac{3}{5} + \\dfrac{1}{4}\\\\ = \\left( {\\dfrac{{ - 2}}{5}} \\right) - \\dfrac{3}{5} + \\dfrac{1}{4} + \\dfrac{1}{3}\\\\ = \\left( { - 1} \\right) + \\dfrac{1}{4} + \\dfrac{1}{3}\\\\ = \\left( {\\dfrac{{ - 12}}{{12}}} \\right) + \\dfrac{3}{{12}} + \\dfrac{4}{{12}}\\\\ = \\dfrac{{ - 5}}{{12}}\\end{array}\\)</p>\r\n<p>d)\\(\\left( {1\\dfrac{1}{2} - \\dfrac{3}{4}} \\right) - \\left( {0,25 + \\dfrac{1}{2}} \\right)\\)</p>\r\n<p>\\(=\\left( {\\dfrac{3}{2} - \\dfrac{3}{4}} \\right) - \\left( {\\dfrac{1}{4} + \\dfrac{1}{2}} \\right) \\\\= \\left( {\\dfrac{3}{2} - \\dfrac{1}{2}} \\right) - \\left( {\\dfrac{3}{4} + \\dfrac{1}{4}} \\right) \\\\= 1 - 1 = 0\\) </p>"},{"article_id":116511,"cat_id":1005,"publish_time":1661131980,"type_ex":0,"is_hot":0,"is_link":0,"thumbnail":"","title":"Giải Bài 2 trang 18 sách bài tập toán 7 tập 1 - Chân trời sáng tạo","label":"Bài 2 trang 18","alias":"giai-bai-2-trang-18-sach-bai-tap-toan-7-tap-1-chan-troi-sang-tao","introtext":"Tính","display_type":1,"article_type":1,"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;\">Lời giải chi tiết</strong></p><p>a)\\(\\left( { - 0,5} \\right) - \\left( { - 1 + \\dfrac{2}{3}} \\right):1,5 + \\left( {\\dfrac{{ - 1}}{4}} \\right)\\)</p>\r\n<p>\\(\\begin{array}{l} = \\left( {\\dfrac{{ - 1}}{2}} \\right) - \\left( {\\dfrac{{ - 3}}{3} + \\dfrac{2}{3}} \\right):\\dfrac{3}{2} + \\left( {\\dfrac{{ - 1}}{4}} \\right)\\\\ = \\left( {\\dfrac{{ - 1}}{2}} \\right) - \\left( {\\dfrac{{ - 1}}{3}} \\right).\\dfrac{2}{3} + \\left( {\\dfrac{{ - 1}}{4}} \\right)\\\\ = \\left( {\\dfrac{{ - 1}}{2}} \\right) + \\dfrac{2}{9} + \\left( {\\dfrac{{ - 1}}{4}} \\right)\\\\ = \\left( {\\dfrac{{ - 18}}{{36}}} \\right) + \\dfrac{8}{{36}} + \\left( {\\dfrac{{ - 9}}{{36}}} \\right) = \\dfrac{{ - 19}}{{36}}\\end{array}\\)</p>\r\n<p>b)\\(\\left[ {\\left( {\\dfrac{{ - 7}}{8}} \\right):\\dfrac{{21}}{{16}}} \\right] - \\dfrac{5}{3}.\\left( {\\dfrac{1}{3} - \\dfrac{7}{{10}}} \\right)\\)</p>\r\n<p>\\(\\begin{array}{l} = \\left[ {\\left( {\\dfrac{{ - 7}}{8}} \\right).\\dfrac{{16}}{{21}}} \\right] - \\dfrac{5}{3}.\\left( {\\dfrac{{10}}{{30}} - \\dfrac{{21}}{{30}}} \\right)\\\\ = \\dfrac{{\\left( { - 7} \\right).16}}{{8.21}} - \\dfrac{5}{3}.\\left( {\\dfrac{{ - 11}}{{30}}} \\right)\\end{array}\\)</p>\r\n<p>\\(\\begin{array}{l} =  - \\dfrac{{7.8.2}}{{8.7.3}} + \\dfrac{{5.11}}{{3.5.6}}\\\\ = \\dfrac{{ - 2}}{3} + \\dfrac{{11}}{{18}} = \\dfrac{{ - 1}}{{18}}\\end{array}\\)</p>\r\n<p>c)\\({\\left[ {\\left( {\\dfrac{{ - 2}}{3}} \\right) + \\dfrac{3}{4}} \\right]^2}.\\dfrac{{12}}{5} - \\dfrac{1}{5}\\) \\( = {\\left[ {\\left( {\\dfrac{{ - 8}}{{12}}} \\right) + \\dfrac{9}{{12}}} \\right]^2}.\\dfrac{{12}}{5} - \\dfrac{1}{5} = {\\left( {\\dfrac{1}{{12}}} \\right)^2}.\\dfrac{{12}}{5} - \\dfrac{1}{5}\\\\ = \\dfrac{1}{{{{12}^2}}}.\\dfrac{{12}}{5} - \\dfrac{1}{5} = \\dfrac{1}{{60}} - \\dfrac{1}{5}= \\dfrac{1}{{60}} - \\dfrac{12}{60} = \\dfrac{{ - 11}}{{60}}\\)</p>\r\n<p>d)\\({\\left( {\\dfrac{1}{{25}} - 0,4} \\right)^2}:\\dfrac{9}{{125}} - \\left[ {\\left( {1\\dfrac{1}{3} - \\dfrac{2}{5}} \\right).\\dfrac{3}{7}} \\right]\\)</p>\r\n<p>\\(\\begin{array}{l} = {\\left( {\\dfrac{1}{{25}} - \\dfrac{2}{5}} \\right)^2}.\\dfrac{{125}}{9} - \\left[ {\\left( {\\dfrac{4}{3} - \\dfrac{2}{5}} \\right).\\dfrac{3}{7}} \\right]\\\\ = {\\left( {\\dfrac{{ - 9}}{{25}}} \\right)^2}.\\dfrac{{125}}{9} - \\left( {\\dfrac{{14}}{{15}}.\\dfrac{3}{7}} \\right)\\\\ = \\dfrac{{{9^2}}}{{{{25}^2}}}.\\dfrac{{125}}{9} - \\dfrac{2}{5}\\\\ = \\dfrac{{{{\\left( {{3^2}} \\right)}^2}}}{{{{\\left( {{5^2}} \\right)}^2}}}.\\dfrac{{{5^3}}}{{{3^2}}} - \\dfrac{2}{5} = \\dfrac{{{3^2}}}{5} - \\dfrac{2}{5} = \\dfrac{9}{5} - \\dfrac{2}{5} = \\dfrac{7}{5}\\end{array}\\)</p>\r\n<p>e)\\(\\left\\{ {3\\dfrac{{17}}{{18}}.\\left[ {\\dfrac{5}{2} - \\left( {\\dfrac{1}{3} + \\dfrac{2}{9}} \\right)} \\right]} \\right\\}:{\\left[ {\\left( {\\dfrac{{ - 1}}{2}} \\right) + 0,25} \\right]^2}\\)</p>\r\n<p>\\(\\begin{array}{l} = \\left\\{ {\\dfrac{{71}}{{18}}.\\left[ {\\dfrac{5}{2} - \\dfrac{5}{9}} \\right]} \\right\\}:{\\left[ {\\left( {\\dfrac{{ - 1}}{2}} \\right) + \\dfrac{1}{4}} \\right]^2}\\\\ = \\left( {\\dfrac{{71}}{{18}}.\\dfrac{{35}}{{18}}} \\right):{\\left( {\\dfrac{1}{4}} \\right)^2} = \\dfrac{{2485}}{{324}}:\\dfrac{1}{{16}} \\\\= \\dfrac{{2485}}{{324}}.16 = \\dfrac{{9940}}{{81}}\\end{array}\\) </p>"},{"article_id":116512,"cat_id":1005,"publish_time":1661132100,"type_ex":0,"is_hot":0,"is_link":0,"thumbnail":"","title":"Giải Bài 3 trang 18 sách bài tập toán 7 tập 1 - Chân trời sáng tạo","label":"Bài 3 trang 18","alias":"giai-bai-3-trang-18-sach-bai-tap-toan-7-tap-1-chan-troi-sang-tao","introtext":"Cho biểu thức:","display_type":1,"article_type":1,"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;\">Lời giải chi tiết</strong></p><p>a)</p>\r\n<p>\\(\\begin{array}{l}A = \\left( {8 - \\dfrac{2}{3} + \\dfrac{1}{2}} \\right) - \\left( {5 - \\dfrac{7}{3} - \\dfrac{3}{2}} \\right) - \\left( {\\dfrac{5}{3} + \\dfrac{5}{2} + 4} \\right)\\\\ = \\left( {\\dfrac{{48}}{6} - \\dfrac{4}{6} + \\dfrac{3}{6}} \\right) - \\left( {\\dfrac{{30}}{6} - \\dfrac{{14}}{6} - \\dfrac{9}{6}} \\right) - \\left( {\\dfrac{{10}}{6} + \\dfrac{{15}}{6} + \\dfrac{{24}}{6}} \\right)\\\\ = \\dfrac{{47}}{6} - \\dfrac{7}{6} - \\dfrac{{49}}{6} = \\dfrac{{ - 9}}{6} = \\dfrac{{ - 3}}{2}\\end{array}\\)</p>\r\n<p>b)</p>\r\n<p>\\(\\begin{array}{l}A = \\left( {8 - \\dfrac{2}{3} + \\dfrac{1}{2}} \\right) - \\left( {5 - \\dfrac{7}{3} - \\dfrac{3}{2}} \\right) - \\left( {\\dfrac{5}{3} + \\dfrac{5}{2} + 4} \\right)\\\\ = 8 - \\dfrac{2}{3} + \\dfrac{1}{2} - 5 + \\dfrac{7}{3} + \\dfrac{3}{2} - \\dfrac{5}{3} - \\dfrac{5}{2} - 4\\\\ = \\left( {8 - 5 - 4} \\right) + \\left( {\\dfrac{7}{3} - \\dfrac{2}{3} - \\dfrac{5}{3}} \\right) + \\left( {\\dfrac{1}{2} + \\dfrac{3}{2} - \\dfrac{5}{2}} \\right)\\\\ = \\left( { - 1} \\right) + 0 - \\dfrac{1}{2} = \\dfrac{{ - 3}}{2}\\end{array}\\) </p>"},{"article_id":116513,"cat_id":1005,"publish_time":1661132160,"type_ex":0,"is_hot":0,"is_link":0,"thumbnail":"","title":"Giải Bài 4 trang 18 sách bài tập toán 7 tập 1 - Chân trời sáng tạo","label":"Bài 4 trang 18","alias":"giai-bai-4-trang-18-sach-bai-tap-toan-7-tap-1-chan-troi-sang-tao","introtext":"Tìm x, biết:","display_type":1,"article_type":1,"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;\">Lời giải chi tiết</strong></p><p>\\(\\begin{array}{l}a)x + \\dfrac{3}{7} = \\dfrac{2}{5}\\\\ \\Leftrightarrow x = \\dfrac{2}{5} - \\dfrac{3}{7}\\end{array}\\)</p>\r\n<p>\\(\\begin{array}{l} \\Leftrightarrow x = \\dfrac{{14}}{{35}} - \\dfrac{{15}}{{35}}\\\\ \\Leftrightarrow x = \\dfrac{{ - 1}}{{35}}\\end{array}\\)</p>\r\n<p>Vậy \\(x = \\dfrac{{ - 1}}{{35}}\\)</p>\r\n<p>\\(\\begin{array}{l}b)\\dfrac{3}{2} - x = \\dfrac{4}{5}\\\\ \\Leftrightarrow x = \\dfrac{3}{2} - \\dfrac{4}{5}\\\\ \\Leftrightarrow x = \\dfrac{{15}}{{10}} - \\dfrac{8}{{10}}\\\\ \\Leftrightarrow x = \\dfrac{7}{{10}}\\end{array}\\)</p>\r\n<p>Vậy \\(x = \\dfrac{{ 7}}{{10}}\\)</p>\r\n<p>\\(\\begin{array}{l}c)\\dfrac{5}{9} - \\dfrac{1}{3}x = \\dfrac{2}{3}\\\\ \\Leftrightarrow \\dfrac{1}{3}x = \\dfrac{5}{9} - \\dfrac{2}{3}\\\\ \\Leftrightarrow \\dfrac{1}{3}x = \\dfrac{{ - 1}}{9}\\\\ \\Leftrightarrow x = \\dfrac{{ - 1}}{9}:\\dfrac{1}{3}\\\\ \\Leftrightarrow x = \\dfrac{{ - 1}}{3}\\end{array}\\)</p>\r\n<p>Vậy \\(x = \\dfrac{{ - 1}}{{3}}\\)</p>\r\n<p>\\(\\begin{array}{l}d)\\dfrac{3}{5}x - 1\\dfrac{1}{5} = \\dfrac{{ - 3}}{{14}}:\\dfrac{5}{7}\\\\ \\Leftrightarrow \\dfrac{3}{5}x - \\dfrac{6}{5} = \\dfrac{{ - 3}}{{10}}\\\\ \\Leftrightarrow \\dfrac{3}{5}x = \\dfrac{{ - 3}}{{10}} + \\dfrac{6}{5}\\\\ \\Leftrightarrow \\dfrac{3}{5}x = \\dfrac{9}{{10}}\\\\ \\Leftrightarrow x = \\dfrac{9}{{10}}:\\dfrac{3}{5}\\\\ \\Leftrightarrow x = \\dfrac{3}{2}\\end{array}\\)</p>\r\n<p>Vậy \\(x = \\dfrac{{ 3}}{{2}}\\)</p>"},{"article_id":116514,"cat_id":1005,"publish_time":1661132280,"type_ex":0,"is_hot":0,"is_link":0,"thumbnail":"","title":"Giải Bài 5 trang 18 sách bài tập toán 7 tập 1 - Chân trời sáng tạo","label":"Bài 5 trang 18","alias":"giai-bai-5-trang-18-sach-bai-tap-toan-7-tap-1-chan-troi-sang-tao","introtext":"Tìm x, biết:","display_type":1,"article_type":1,"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;\">Lời giải chi tiết</strong></p><p>\\(\\begin{array}{l}a)\\dfrac{3}{4} + \\dfrac{1}{9}:x = 0,5\\\\ \\Leftrightarrow \\dfrac{1}{9}:x = \\dfrac{1}{2} - \\dfrac{3}{4}\\\\ \\Leftrightarrow \\dfrac{1}{9}:x = \\dfrac{{ - 1}}{4}\\\\ \\Leftrightarrow x = \\dfrac{1}{9}:\\dfrac{{ - 1}}{4}\\\\ \\Leftrightarrow x = \\dfrac{{ - 4}}{9}\\end{array}\\)</p>\r\n<p>Vậy \\(x = \\dfrac{{ - 4}}{9}\\)</p>\r\n<p>\\(\\begin{array}{l}b)\\dfrac{3}{4} - \\left( {x - \\dfrac{2}{3}} \\right) = 1\\dfrac{1}{3}\\\\ \\Leftrightarrow x - \\dfrac{2}{3} = \\dfrac{3}{4} - \\dfrac{4}{3}\\\\ \\Leftrightarrow x - \\dfrac{2}{3} = \\dfrac{{ - 7}}{{12}}\\\\ \\Leftrightarrow x = \\dfrac{{ - 7}}{{12}} + \\dfrac{2}{3}\\\\ \\Leftrightarrow x = \\dfrac{1}{{12}}\\end{array}\\)</p>\r\n<p>Vậy \\(x = \\dfrac{{ 1}}{12}\\)</p>\r\n<p>\\(\\begin{array}{l}c)\\left( {\\dfrac{5}{7} - x} \\right).\\dfrac{{11}}{{15}} = \\dfrac{{ - 22}}{{45}}\\\\ \\Leftrightarrow \\dfrac{5}{7} - x = \\dfrac{{ - 22}}{{45}}:\\dfrac{{11}}{{15}}\\end{array}\\)</p>\r\n<p>\\(\\begin{array}{l} \\Leftrightarrow \\dfrac{5}{7} - x = \\dfrac{{ - 2}}{3}\\\\ \\Leftrightarrow x = \\dfrac{5}{7} - \\left( {\\dfrac{{ - 2}}{3}} \\right)\\end{array}\\)</p>\r\n<p>\\(\\begin{array}{l} \\Leftrightarrow x = \\dfrac{5}{7} + \\dfrac{2}{3}\\\\\\Leftrightarrow x = \\dfrac{15}{21} + \\dfrac{14}{21}\\\\ \\Leftrightarrow x = \\dfrac{{29}}{{21}}\\end{array}\\)</p>\r\n<p>Vậy \\(x = \\dfrac{{ 29}}{21}\\)</p>\r\n<p>\\(\\begin{array}{l}d)\\left( {2,5x - \\dfrac{4}{7}} \\right):\\dfrac{8}{{21}} =  - 1,5\\\\ \\Leftrightarrow \\left( {\\dfrac{5}{2}x - \\dfrac{4}{7}} \\right) = \\dfrac{{ - 3}}{2}.\\dfrac{8}{{21}}\\\\ \\Leftrightarrow \\dfrac{5}{2}x - \\dfrac{4}{7} = \\dfrac{{ - 4}}{7}\\\\ \\Leftrightarrow \\dfrac{5}{2}x = \\dfrac{{ - 4}}{7} + \\dfrac{4}{7}\\\\ \\Leftrightarrow \\dfrac{5}{2}x = 0\\\\ \\Leftrightarrow x = 0\\end{array}\\)</p>\r\n<p>Vậy \\(x =0\\)</p>"},{"article_id":116515,"cat_id":1005,"publish_time":1661132340,"type_ex":0,"is_hot":0,"is_link":0,"thumbnail":"","title":"Giải Bài 6 trang 18 sách bài tập toán 7 tập 1 - Chân trời sáng tạo","label":"Bài 6 trang 18","alias":"giai-bai-6-trang-18-sach-bai-tap-toan-7-tap-1-chan-troi-sang-tao","introtext":"Tính nhanh","display_type":1,"article_type":1,"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;\">Lời giải chi tiết</strong></p><p>\\(\\begin{array}{l}a)\\dfrac{{12}}{{23}}.\\dfrac{7}{{13}} + \\dfrac{{11}}{{23}}.\\dfrac{7}{{13}} = \\dfrac{7}{{13}}.\\left( {\\dfrac{{12}}{{23}} + \\dfrac{{11}}{{23}}} \\right) =\\dfrac{7}{{13}}.\\dfrac{23}{23}= \\dfrac{7}{{13}}.1 = \\dfrac{7}{{13}}\\\\b)\\dfrac{4}{9}.\\dfrac{{23}}{{11}} - \\dfrac{1}{{11}}.\\dfrac{4}{9} + \\dfrac{4}{9} = \\dfrac{4}{9}.\\left( {\\dfrac{{23}}{{11}} - \\dfrac{1}{{11}} + 1} \\right) = \\dfrac{4}{9}.(2 + 1) = \\dfrac{4}{9}.3 = \\dfrac{4}{3}\\end{array}\\)</p>\r\n<p>\\(c)\\left[ {\\left( {\\dfrac{{ - 5}}{7}} \\right) + \\dfrac{3}{5}} \\right]:\\dfrac{{2020}}{{2021}} + \\left( {\\dfrac{2}{5} - \\dfrac{2}{7}} \\right):\\dfrac{{2020}}{{2021}}\\)</p>\r\n<p>\\(\\begin{array}{l} = \\left[ {\\left( {\\dfrac{{ - 5}}{7}} \\right) + \\dfrac{3}{5}} \\right].\\dfrac{{2021}}{{2020}} + \\left( {\\dfrac{2}{5} - \\dfrac{2}{7}} \\right).\\dfrac{{2021}}{{2020}}\\\\ = \\left[ {\\left( {\\dfrac{{ - 5}}{7}} \\right) + \\dfrac{3}{5} + \\dfrac{2}{5} - \\dfrac{2}{7}} \\right].\\dfrac{{2021}}{{2020}}\\end{array}\\)</p>\r\n<p>\\(\\begin{array}{l} = \\left[ {\\left( {\\dfrac{{ - 5}}{7} - \\dfrac{2}{7}} \\right) + \\left( {\\dfrac{3}{5} + \\dfrac{2}{5}} \\right)} \\right].\\dfrac{{2021}}{{2020}}\\\\ = (-1 + 1).\\dfrac{{2021}}{{2020}} = 0.\\dfrac{{2021}}{{2020}} = 0\\end{array}\\)</p>\r\n<p>\\(\\begin{array}{l}d)\\dfrac{3}{8}:\\left( {\\dfrac{7}{{22}} - \\dfrac{2}{{11}}} \\right) + \\dfrac{3}{8}:\\left( {\\dfrac{2}{5} - \\dfrac{1}{{10}}} \\right)\\\\ = \\dfrac{3}{8}:\\left( {\\dfrac{7}{{22}} - \\dfrac{4}{{22}}} \\right) + \\dfrac{3}{8}:\\left( {\\dfrac{4}{{10}} - \\dfrac{1}{{10}}} \\right)\\\\ = \\dfrac{3}{8}:\\dfrac{3}{{22}} + \\dfrac{3}{8}:\\dfrac{3}{{10}}\\\\ = \\dfrac{3}{8}.\\dfrac{{22}}{3} + \\dfrac{3}{8}.\\dfrac{{10}}{3}\\\\ = \\dfrac{{22}}{8} + \\dfrac{{10}}{8} = \\dfrac{{32}}{8} = 4\\end{array}\\)</p>"}],"most_views":[{"article_id":116511,"cat_id":1005,"publish_time":1661131980,"is_hot":0,"is_link":0,"thumbnail":"","title":"Giải Bài 2 trang 18 sách bài tập toán 7 tập 1 - Chân trời sáng tạo","alias":"giai-bai-2-trang-18-sach-bai-tap-toan-7-tap-1-chan-troi-sang-tao","introtext":"Tính","display_type":1},{"article_id":116514,"cat_id":1005,"publish_time":1661132280,"is_hot":0,"is_link":0,"thumbnail":"","title":"Giải Bài 5 trang 18 sách bài tập toán 7 tập 1 - Chân trời sáng tạo","alias":"giai-bai-5-trang-18-sach-bai-tap-toan-7-tap-1-chan-troi-sang-tao","introtext":"Tìm x, biết:","display_type":1},{"article_id":116510,"cat_id":1005,"publish_time":1661131860,"is_hot":0,"is_link":0,"thumbnail":"","title":"Giải Bài 1 trang 17 sách bài tập toán 7 tập 1 - Chân trời sáng tạo","alias":"giai-bai-1-trang-17-sach-bai-tap-toan-7-tap-1-chan-troi-sang-tao","introtext":"Bỏ ngoặc rồi tính","display_type":1},{"article_id":116512,"cat_id":1005,"publish_time":1661132100,"is_hot":0,"is_link":0,"thumbnail":"","title":"Giải Bài 3 trang 18 sách bài tập toán 7 tập 1 - Chân trời sáng tạo","alias":"giai-bai-3-trang-18-sach-bai-tap-toan-7-tap-1-chan-troi-sang-tao","introtext":"Cho biểu thức:","display_type":1},{"article_id":116515,"cat_id":1005,"publish_time":1661132340,"is_hot":0,"is_link":0,"thumbnail":"","title":"Giải Bài 6 trang 18 sách bài tập toán 7 tập 1 - Chân trời sáng tạo","alias":"giai-bai-6-trang-18-sach-bai-tap-toan-7-tap-1-chan-troi-sang-tao","introtext":"Tính nhanh","display_type":1}],"list_sub_event":[],"top_banner":"","cfg_info":{"last_cfg_time":"1521866679","ad.popup_frequency":"0","ad.adsense.detail_bottom.unit_id":"ca-app-pub-8529835372050931/9927553003","ad.adsense.popup.unit_id":"ca-app-pub-8529835372050931/2161779402","current.force.update.version":"181","support.email":"loigiaihay.com@gmail.com","support.fanpage":"https://www.facebook.com/Loigiaihay/","popup_rating_after":"86400","admob.app_id":"ca-app-pub-8529835372050931~4358271409","admob.unit.article_detail_bottom":"ca-app-pub-8529835372050931/1883637630","admob.unit.article_detail_top":"ca-app-pub-8529835372050931/8604898230","admob.unit.event_article_top":"ca-app-pub-8529835372050931/7406887709","admob.unit.interestial":"ca-app-pub-8529835372050931/2741937409","ios_appstore_link":"https://itunes.apple.com/us/app/loigiaihay/id1209891610?mt=8","android_appstore_link":"https://play.google.com/store/apps/details?id=com.tp.loigiaihay","min_version":"2.1.3","latest_version":"1.3.9","force_update":false},"popup_ads":[]}