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HomeLớp 4Toán lớp 4 - Sách Kết nối tri thứcBài 40. Tính chất giao hoán và kết hợp của phép nhânBài tập nâng cao
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\" y=\"3\"><\/image> <\/g> <\/svg><\/span><\/p><p><strong><span style=\"color:#f39c12;\">8 x 50&nbsp; &nbsp;=&nbsp; &nbsp;(&lt;input class=\"tim_x input_number\" tpl=\"dien_so\" type=\"text\"\/&gt;&nbsp;+ 30) x 8<\/span><\/strong><\/p>","options":"","correct":["[\"20\"]"],"level":"3","hint":"<p>Ta c&oacute; <span style=\"color:#2980b9;\">8 x 50 = 50 x 8<\/span><\/p>","answer":"<p>Ta c&oacute;:&nbsp;8 x 50 = 50 x 8, do \u0111&oacute;<\/p><p>&nbsp; &nbsp; &nbsp; &nbsp;8 x 50 = (<span style=\"color:#16a085;\"><strong>20<\/strong><\/span>&nbsp;+ 30) x 8<\/p><p>S\u1ed1 c\u1ea7n \u0111i\u1ec1n l&agrave; <span style=\"color:#16a085;\"><strong>20<\/strong><\/span><\/p>","type":"blank","extra_type":"","time":"0","user_id":"131","test":"0","date":"2023-12-10 03:44:49"},{"id":"1866","post_id":"6857","mon_id":"1159012","chapter_id":"1159015","question":"<p>Ch\u1ecdn s\u1ed1 th&iacute;ch h\u1ee3p v&agrave;o ch\u1ed7 tr\u1ed1ng.<\/p><p><span style=\"color:#8e44ad;\"><strong>13 x 5 x 6&nbsp; &nbsp;=&nbsp; &nbsp;6 x&nbsp;&lt;input class=\"_tit_hoi\" disabled=\"disabled\" type=\"text\"\/&gt;&lt;\/strong><\/span><\/p>","options":["<strong>A.<\/strong> 75","<strong>B.<\/strong> 13","<strong>C.<\/strong> 65","<strong>D.<\/strong> 45"],"correct":"3","level":"3","hint":"<p><span style=\"color:#2980b9;\">13 x 5 x 6&nbsp; &nbsp;=&nbsp; &nbsp;6 x&nbsp;(13 x 5)<\/span><\/p>","answer":"<p>13 x 5 x 6 = 6 x&nbsp;(13 x 5) = 6 x <strong>65<\/strong><\/p><p>Ch\u1ecdn&nbsp;<span style=\"color:#16a085;\"><strong>C.<\/strong>&nbsp;65<\/span><\/p>","type":"choose","extra_type":"sheep","time":"0","user_id":"131","test":"0","date":"2023-12-10 03:51:45","option_type":"txt","len":0},{"id":"1894","post_id":"6857","mon_id":"1159012","chapter_id":"1159015","question":"<p>Ch\u1ecdn s\u1ed1 th&iacute;ch h\u1ee3p \u0111i\u1ec1n v&agrave;o ch\u1ed7 tr\u1ed1ng.<\/p><p>30 x (8 x 9) = 72 x&nbsp;&lt;input class=\"_tit_hoi\" disabled=\"disabled\" type=\"text\"\/&gt;&lt;\/p>","options":["<strong>A.<\/strong> 72","<strong>B.<\/strong> 30","<strong>C.<\/strong> 8","<strong>D.<\/strong> 9"],"correct":"2","level":"3","hint":"","answer":"<p>30 x (8 x 9) = 30 x 72 = 72 x <span style=\"color:#16a085;\"><strong>30<\/strong><\/span><\/p><p>Ch\u1ecdn&nbsp;<span style=\"color:#16a085;\"><strong>B.<\/strong>&nbsp;30<\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"0","date":"2023-12-10 04:44:34","option_type":"txt","len":0}]}
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Tiểu học
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