Toán lớp 7 - Sách kết nối tri thức - Đề kiểm tra 15 phút - Toán lớp 7 - Sách kết nối tri thức - Tháng 9 - Số 1

{"save":1,"level":1,"time":"15","total":10,"point":5,"segment":[{"id":"9843","test_id":"662","question":"<p>V\u1edbi \u0111i\u1ec1u ki\u1ec7n n&agrave;o c\u1ee7a b th&igrave; ph&acirc;n s\u1ed1&nbsp;<span class=\"math-tex\">$\\dfrac{a}{b} $<\/span>&nbsp;(v\u1edbi a <span class=\"math-tex\">$\\in$<\/span>&nbsp;\u2124) l&agrave; s\u1ed1 h\u1eefu t\u1ec9?<\/p>","options":["<strong>A.<\/strong>&nbsp;b &isin; \u2124, b &ne; 0.","<strong>B.<\/strong> b &ne; 0.","<strong>C.<\/strong> b &isin; \u2124.","<strong>D.<\/strong> b &isin; \u2115, b &ne; 0."],"correct":"1","answer":"<p><span style=\"color:#16a085;\"><\/span><\/p><p data-end=\"379\" data-start=\"212\">Ch\u1ecdn&nbsp;<strong data-end=\"377\" data-start=\"326\"><span style=\"color:#16a085;\">A.<\/span><\/strong><strong data-end=\"377\" data-start=\"326\"><span style=\"color:#16a085;\"> <\/span><\/strong><span style=\"color:#16a085;\">b &isin; \u2124, b &ne; 0.<\/span><\/p><p data-end=\"550\" data-start=\"381\">Ph&acirc;n s\u1ed1&nbsp;<span class=\"math-tex\">$\\dfrac{a}{b}$<\/span> l&agrave; s\u1ed1 h\u1eefu t\u1ec9 khi <strong data-end=\"476\" data-start=\"443\">c\u1ea3<\/strong><strong data-end=\"476\" data-start=\"443\"> t\u1eed v&agrave; m\u1eabu \u0111<\/strong><strong data-end=\"476\" data-start=\"443\">\u1ec1u l&agrave; s\u1ed1 nguy&ecirc;n<\/strong>&nbsp;v&agrave; <strong data-end=\"495\" data-start=\"481\">m\u1eabu kh&aacute;c 0<\/strong>.<\/p><p data-end=\"550\" data-start=\"381\">&rarr; a &isin; \u2124, b &isin; \u2124, b &ne; 0.<\/p>","type":"choose","user_id":"87","test":"2","date":"2025-07-31 13:07:38"},{"id":"9845","test_id":"662","question":"<p>&nbsp;S\u1ed1&nbsp;<span class=\"math-tex\">$\\dfrac{-3}{14}$<\/span>&nbsp; l&agrave; hi\u1ec7u c\u1ee7a hai s\u1ed1 h\u1eefu t\u1ec9 n&agrave;o d\u01b0\u1edbi \u0111&acirc;y?<\/p><p>&nbsp;<\/p>","options":["<strong>A.<\/strong>&nbsp;<span class=\"math-tex\">$\\dfrac{2}{3}-\\dfrac{5}{7}$<\/span>.","<strong>B.<\/strong>&nbsp;<span class=\"math-tex\">$\\dfrac{7}{6}-\\dfrac{4}{5}$<\/span>.","<strong>C.<\/strong>&nbsp;<span class=\"math-tex\">$\\dfrac{1}{2}-\\dfrac{5}{7}$<\/span>.","<strong>D.<\/strong>&nbsp;<span class=\"math-tex\">$\\dfrac{4}{7}-\\dfrac{5}{8}$<\/span>."],"correct":"3","answer":"<p>Ch\u1ecdn&nbsp;<span style=\"color:#16a085;\"><strong>C.&nbsp;<span class=\"math-tex\">$\\dfrac{1}{2}-\\dfrac{5}{7}$<\/span>.<\/strong><\/span><\/p><p><strong>A.<\/strong>&nbsp;<span class=\"math-tex\">$\\dfrac{2}{3}-\\dfrac{5}{7}=\\dfrac{14}{21}-\\dfrac{15}{21}=\\dfrac{-1}{21}$<\/span>.<\/p><p><strong>B.<\/strong>&nbsp;<span class=\"math-tex\">$\\dfrac{7}{6}-\\dfrac{4}{5}=\\dfrac{35}{30}-\\dfrac{24}{30}=\\dfrac{11}{30}$<\/span>.<\/p><p><span style=\"color:#16a085;\"><strong>C.<\/strong>&nbsp;<span class=\"math-tex\">$\\dfrac{1}{2}-\\dfrac{5}{7}=\\dfrac{7}{14}-\\dfrac{10}{14}=\\dfrac{-3}{14}$<\/span>.<\/span><\/p><p><strong>D.<\/strong>&nbsp;<span class=\"math-tex\">$\\dfrac{4}{7}-\\dfrac{5}{8}=\\dfrac{32}{56}-\\dfrac{35}{56}=\\dfrac{-3}{56}$<\/span>.<\/p>","type":"choose","user_id":"126","test":"1","date":"2025-08-01 11:55:53"}]}