Toán lớp 7 - Sách kết nối tri thức - Đề kiểm tra 15 phút - Toán lớp 7 - Sách kết nối tri thức - Tháng 3 - Số 2

{"save":1,"level":1,"time":"15","total":10,"point":5,"segment":[{"id":"10313","test_id":"691","question":"<p>Gi&aacute; tr\u1ecb n&agrave;o sau \u0111&acirc;y c\u1ee7a x l&agrave; m\u1ed9t nghi\u1ec7m c\u1ee7a \u0111a th\u1ee9c&nbsp;<span class=\"math-tex\">$A(x)=x^2-5x+6$<\/span>?<\/p>","options":["<strong>A.<\/strong>&nbsp;x = 2.","<strong>B.<\/strong>&nbsp;x = 1.","<strong>C.<\/strong>&nbsp;x = 0.","<p data-end=\"693\" data-start=\"666\"><strong>D.<\/strong>&nbsp;x = &ndash;2.<\/p>"],"correct":"1","answer":"<p>Ch\u1ecdn&nbsp;<span style=\"color:#16a085;\"><strong>A.<\/strong>&nbsp;x = 2.<\/span><\/p><p><span class=\"math-tex\">$A(2)=2^2-5.2+6=0$<\/span>&nbsp;n&ecirc;n <span style=\"color:#16a085;\"><strong>x = 2 l&agrave; m\u1ed9t&nbsp;nghi\u1ec7m c\u1ee7a \u0111a th\u1ee9c A(x)<\/strong><\/span>.<\/p><p><span class=\"math-tex\">$A(1)=1^2-5.1+6=2$<\/span>&nbsp;n&ecirc;n x = 1 kh&ocirc;ng l&agrave; nghi\u1ec7m c\u1ee7a \u0111a th\u1ee9c A(x).<\/p><p><span class=\"math-tex\">$A(0)=0^2-5.0+6=6$<\/span>&nbsp;n&ecirc;n x = 0 kh&ocirc;ng l&agrave; nghi\u1ec7m c\u1ee7a \u0111a th\u1ee9c A(x).<\/p><p><span class=\"math-tex\">$A(-2)=(-2)^2-5.(-2)+6=20$<\/span>&nbsp;n&ecirc;n x = &ndash;2 kh&ocirc;ng l&agrave; nghi\u1ec7m c\u1ee7a \u0111a th\u1ee9c A(x).<\/p>","type":"choose","user_id":"126","test":"1","date":"2025-08-03 21:25:51"},{"id":"10314","test_id":"691","question":"<p>M\u1ed9t m\u1ea3nh \u0111\u1ea5t h&igrave;nh ch\u1eef nh\u1eadt c&oacute; chi\u1ec1u r\u1ed9ng l&agrave; x (m) (x &gt; 0) v&agrave; chi\u1ec1u d&agrave;i h\u01a1n chi\u1ec1u r\u1ed9ng 2 m. Vi\u1ebft bi\u1ec3u th\u1ee9c \u0111\u1ea1i s\u1ed1 bi\u1ec3u th\u1ecb di\u1ec7n t&iacute;ch c\u1ee7a m\u1ea3nh \u0111\u1ea5t \u0111&oacute;.<\/p>","options":["<strong>A.<\/strong>&nbsp;x(x &ndash; 2) (m&sup2;).","<strong>B.<\/strong> 2x + 2&nbsp;(m&sup2;).","<strong>C.<\/strong> x(x + 2) (m&sup2;).","<p data-end=\"978\" data-start=\"837\"><strong>D.<\/strong> 2x (m&sup2;).<\/p>"],"correct":"3","answer":"<p>Ch\u1ecdn&nbsp;<span style=\"color:#16a085;\"><strong>C.<\/strong> x(x + 2) (m&sup2;).<\/span><\/p><p>V&igrave;&nbsp;chi\u1ec1u d&agrave;i h\u01a1n chi\u1ec1u r\u1ed9ng 2 m n&ecirc;n chi\u1ec1u d&agrave;i l&agrave; x + 2 (m).<\/p><p>Di\u1ec7n t&iacute;ch c\u1ee7a m\u1ea3nh \u0111\u1ea5t l&agrave; x(x + 2) (m&sup2;).<\/p>","type":"choose","user_id":"126","test":"1","date":"2025-08-03 21:27:00"}]}