{"save":1,"level":1,"time":"90","total":34,"point":5,"segment":[{"id":"3527","test_id":"482","question":"<p>Cho c\u1ea5p s\u1ed1 nh&acirc;n&nbsp;<span class=\"math-tex\">$(u_n)$<\/span>&nbsp;c&oacute;&nbsp;<span class=\"math-tex\">$u_3=12$<\/span>&nbsp;v&agrave; c&ocirc;ng b\u1ed9i q = 2. S\u1ed1 h\u1ea1ng \u0111\u1ea7u ti&ecirc;n&nbsp;<span class=\"math-tex\">$u_1$<\/span>&nbsp;b\u1eb1ng:<\/p>","options":["A. 3","B. 8","C. 4","D. 6"],"correct":"1","answer":"<p>\u0110&aacute;p &aacute;n \u0111&uacute;ng l&agrave;: <span style=\"color:#16a085;\"><strong>A. 3.<\/strong><\/span><\/p><p>Ta c&oacute;:&nbsp;<span class=\"math-tex\">$u_3=u_1.q^2$<\/span>&nbsp;&hArr;&nbsp;<span class=\"math-tex\">$u_1=\\dfrac{u_3}{q^2}=\\dfrac{12}{2^2}=3$<\/span>.<\/p><p>V\u1eady s\u1ed1 h\u1ea1ng \u0111\u1ea7u ti&ecirc;n l&agrave;&nbsp;<span class=\"math-tex\">$u_1 =3$<\/span>.<\/p>","type":"choose","user_id":"126","test":"1","date":"2025-04-23 16:29:04"},{"id":"3529","test_id":"482","question":"<p>H\u1ecd nguy&ecirc;n h&agrave;m c\u1ee7a h&agrave;m s\u1ed1&nbsp;<span class=\"math-tex\">$f(x)=sinx$<\/span>&nbsp;l&agrave;:<\/p>","options":["<strong>A.<\/strong>&nbsp;<span class=\"math-tex\">$\\int f(x)dx = -cosx + C $<\/span>","<strong>B.<\/strong>&nbsp;<span class=\"math-tex\">$\\int f(x)dx = tanx + C $<\/span>","<strong>C.<\/strong>&nbsp;<span class=\"math-tex\">$\\int f(x)dx = cosx + C $<\/span>","<strong>D.<\/strong>&nbsp;<span class=\"math-tex\">$\\int f(x)dx = cotx + C $<\/span>"],"correct":"1","answer":"<p>\u0110&aacute;p &aacute;n \u0111&uacute;ng l&agrave;:&nbsp;<span style=\"color:#16a085;\"><strong>A.&nbsp;<span class=\"math-tex\">$\\int f(x)dx = -cosx + C $<\/span>.<\/strong><\/span><\/p><p><span class=\"math-tex\">$\\int f(x)dx=\\int \\sin xdx=-cosx+C$<\/span>.<\/p>","type":"choose","user_id":"126","test":"1","date":"2025-04-23 16:36:18"}]}