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\">$\\frac{a}{b} $<\/span>(v\u1edbi a&isin;Z) l&agrave; s\u1ed1 h\u1eefu t\u1ec9?<\/p>","options":["A.&nbsp;&nbsp;b &isin; \u2124, b &ne; 0&nbsp;","B. b &ne; 0","C. b &isin; \u2124","D. b &isin; \u2115, b &ne; 0"],"correct":"1","answer":"<p><span style=\"color:#16a085;\"><\/span><\/p><p data-end=\"379\" data-start=\"212\"><strong data-end=\"377\" data-start=\"326\">\u0110&aacute;p &aacute;n \u0111&uacute;ng: A. <\/strong>b &isin; \u2124, b &ne; 0<\/p><p data-end=\"550\" data-start=\"381\"><strong data-end=\"396\" data-start=\"381\">Gi\u1ea3i th&iacute;ch:&nbsp;<\/strong>Ph&acirc;n s\u1ed1&nbsp;<span class=\"math-tex\">$\\frac{a}{b}$<\/span> l&agrave; s\u1ed1 h\u1eefu t\u1ec9 khi <strong data-end=\"476\" data-start=\"443\">c\u1ea3 t\u1eed v&agrave; m\u1eabu \u0111\u1ec1u l&agrave; s\u1ed1 nguy&ecirc;n<\/strong>, v&agrave; <strong data-end=\"495\" data-start=\"481\">m\u1eabu kh&aacute;c 0<\/strong>.<\/p><p data-end=\"550\" data-start=\"381\">&rarr; a&isin;Z,b&isin;Z,b&ne;0<\/p>","type":"choose","user_id":"87","test":"1","date":"2025-07-31 13:07:38"},{"id":"9845","test_id":"662","question":"<p>&nbsp;S\u1ed1&nbsp;<span class=\"math-tex\">$\\frac{-3}{14}$<\/span>&nbsp; l&agrave; hi\u1ec7u c\u1ee7a hai s\u1ed1 h\u1eefu t\u1ec9 n&agrave;o d\u01b0\u1edbi \u0111&acirc;y?<\/p><p>&nbsp;<\/p>","options":["A.&nbsp;<span class=\"math-tex\">$\\frac{2}{3}-\\frac{5}{7}$<\/span>","B.&nbsp;<span class=\"math-tex\">$\\frac{7}{6}-\\frac{4}{5}$<\/span><span class=\"frac123\"><span class=\"ms\"><\/span><\/span>","C.&nbsp;<span class=\"math-tex\">$\\frac{1}{2}-\\frac{5}{7}$<\/span>","D.&nbsp;<span class=\"math-tex\">$\\frac{4}{7}-\\frac{5}{8}$<\/span>"],"correct":"3","answer":"<p>\u0110&aacute;p &aacute;n \u0111&uacute;ng l&agrave;:&nbsp;C.&nbsp;<span class=\"math-tex\">$\\frac{1}{2}-\\frac{5}{7}$<\/span><\/p><p>G\u1ee3i &yacute;: Quy \u0111\u1ed3ng m\u1eabu s\u1ed1 v&agrave; th\u1eed t\u1eebng \u0111&aacute;p &aacute;n<\/p>","type":"choose","user_id":"126","test":"1","date":"2025-08-01 11:55:53"}]}