Chú ý: Để đảm bảo quyền lợi và bảo vệ tài khoản của mình
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{"common":{"save":0,"post_id":"6186","level":1,"total":10,"point":10,"point_extra":0},"segment":[{"id":"5346","mon_id":"1158767","chapter_id":"1158801","post_id":"6186","question":"<p>Hoành \u0111\u1ed9 \u0111\u1ec9nh c\u1ee7a parabol <span class=\"math-tex\">$(P):y = 2x^2 - 4x + 3$<\/span> là <\/p>","options":["<strong>A.<\/strong> –2","<strong>B.<\/strong> 2","<strong>C. <\/strong>–1","<strong>D.<\/strong> 1"],"correct":"4","level":"1","hint":"<p>Parabol <span class=\"math-tex\">$y = ax^2 + bx + c$<\/span> , <span class=\"math-tex\">$a \\ne 0$<\/span> có \u0111\u1ec9nh <span class=\"math-tex\">$I \\left( -\\dfrac{b}{2a} ; - \\dfrac{\\Delta }{4a}\\right)$<\/span> .<\/p>","answer":"<p>Hoành \u0111\u1ed9 \u0111\u1ec9nh c\u1ee7a parabol <span class=\"math-tex\">$y=2x^2-4x+3$<\/span> là 1 ( = <span class=\"math-tex\">$-\\dfrac{-4}{2 . 2}$<\/span> ).<\/p><p>\u0110áp án \u0111úng là <span style=\"color:#16a085;\"><strong>D.<\/strong> 1<\/span><\/p>","type":"choose","extra_type":"classic","user_id":"131","test":"0","date":"2022-09-03 12:12:30","option_type":"txt","len":1},{"id":"5351","mon_id":"1158767","chapter_id":"1158801","post_id":"6186","question":"<p>Hàm s\u1ed1 <span class=\"math-tex\">$y = x^2 - 4x + 9$<\/span> \u0111\u1ed3ng bi\u1ebfn trên kho\u1ea3ng nào sau \u0111ây?<\/p>","options":["<strong>A.<\/strong> <span class=\"math-tex\">$(-2 ; + \\infty )$<\/span>","<strong>B.<\/strong> <span class=\"math-tex\">$(- \\infty ; + \\infty)$<\/span>","<strong>C.<\/strong> <span class=\"math-tex\">$(2 ; + \\infty)$<\/span>","<strong>D.<\/strong> <span class=\"math-tex\">$(- \\infty ; 2)$<\/span>"],"correct":"3","level":"1","hint":"<p>Hàm s\u1ed1 <span class=\"math-tex\">$y = ax^2 + bx + c$<\/span> có <span class=\"math-tex\">$a > 0$<\/span> thì ngh\u1ecbch bi\u1ebfn trên kho\u1ea3ng <span class=\"math-tex\">$\\left( - \\infty ; -\\dfrac{b}{2a} \\right)$<\/span> và \u0111\u1ed3ng bi\u1ebfn trên kho\u1ea3ng <span class=\"math-tex\">$\\left( -\\dfrac{b}{2a} ; + \\infty \\right)$<\/span> .<\/p>","answer":"<p>Hàm s\u1ed1 <span class=\"math-tex\">$y = x^2 - 4x + 9$<\/span> có h\u1ec7 s\u1ed1 <span class=\"math-tex\">$a = 1 > 0$<\/span> nên ngh\u1ecbch bi\u1ebfn trên kho\u1ea3ng <span class=\"math-tex\">$(- \\infty ; 2)$<\/span> và \u0111\u1ed3ng bi\u1ebfn trên kho\u1ea3ng <span class=\"math-tex\">$(2 ; + \\infty)$<\/span> (b\u1ea3ng bi\u1ebfn thiên).<\/p><p><span class=\"svgedit\"><svg height=\"100\" width=\"400\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\"> <g> <title><\/title> <rect fill=\"#fff\" height=\"102\" id=\"canvas_background\" width=\"402\" x=\"-1\" y=\"-1\"><\/rect> <g display=\"none\" height=\"100%\" id=\"canvasGrid\" overflow=\"visible\" width=\"100%\" x=\"0\" y=\"0\"> <rect fill=\"url(#gridpattern)\" height=\"100%\" stroke-width=\"0\" width=\"100%\" x=\"0\" y=\"0\"><\/rect> <\/g> <\/g> <g> <title><\/title> <image height=\"101\" id=\"svg_1\" width=\"398\" x=\"-1\" xlink:href=\"data:image\/png;base64,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\" y=\"0.5\"><\/image> <\/g> <\/svg><\/span><\/p><p>\u0110áp án \u0111úng là <span style=\"color:#16a085;\"> <strong>C.<\/strong> <span class=\"math-tex\">$(2 ; + \\infty)$<\/span><\/span><\/p>","type":"choose","extra_type":"classic","user_id":"131","test":"0","date":"2022-09-03 12:30:18","option_type":"math","len":0},{"id":"5352","mon_id":"1158767","chapter_id":"1158801","post_id":"6186","question":"<p>Kho\u1ea3ng ngh\u1ecbch bi\u1ebfn c\u1ee7a hàm s\u1ed1 <span class=\"math-tex\">$y = x^2 - 4x$<\/span> là<\/p>","options":["<strong>A.<\/strong> <span class=\"math-tex\">$( - \\infty ; 2)$<\/span>","<strong>B.<\/strong> <span class=\"math-tex\">$( - \\infty ; -2)$<\/span>","<strong>C.<\/strong> <span class=\"math-tex\">$( - \\infty ; 4)$<\/span>","<strong>D.<\/strong> <span class=\"math-tex\">$( - \\infty ; -4)$<\/span>"],"correct":"1","level":"1","hint":"<p>Hàm s\u1ed1 <span class=\"math-tex\">$y = ax^2 + bx + c$<\/span> có <span class=\"math-tex\">$a > 0$<\/span> thì ngh\u1ecbch bi\u1ebfn trên kho\u1ea3ng <span class=\"math-tex\">$\\left( - \\infty ; -\\dfrac{b}{2a} \\right)$<\/span> và \u0111\u1ed3ng bi\u1ebfn trên kho\u1ea3ng <span class=\"math-tex\">$\\left( -\\dfrac{b}{2a} ; + \\infty \\right)$<\/span> .<\/p>","answer":"<p>Hàm s\u1ed1 <span class=\"math-tex\">$y = x^2 - 4x $<\/span> có h\u1ec7 s\u1ed1 <span class=\"math-tex\">$a = 1 > 0$<\/span> nên ngh\u1ecbch bi\u1ebfn trên kho\u1ea3ng <span class=\"math-tex\">$(- \\infty ; 2)$<\/span> và \u0111\u1ed3ng bi\u1ebfn trên kho\u1ea3ng <span class=\"math-tex\">$(2 ; + \\infty)$<\/span> (b\u1ea3ng bi\u1ebfn thiên).<\/p><p><span class=\"svgedit\"><svg height=\"95\" width=\"355\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\"> <g> <title><\/title> <rect fill=\"#fff\" height=\"97\" id=\"canvas_background\" width=\"357\" x=\"-1\" y=\"-1\"><\/rect> <g display=\"none\" height=\"100%\" id=\"canvasGrid\" overflow=\"visible\" width=\"100%\" x=\"0\" y=\"0\"> <rect fill=\"url(#gridpattern)\" height=\"100%\" stroke-width=\"0\" width=\"100%\" x=\"0\" y=\"0\"><\/rect> <\/g> <\/g> <g> <title><\/title> <image height=\"101\" id=\"svg_1\" width=\"359\" x=\"-3.5\" 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y=\"-6.5\"><\/image> <\/g> <\/svg><\/span><\/p><p>\u0110áp án \u0111úng là <span style=\"color:#16a085;\"><strong>A.<\/strong> <span class=\"math-tex\">$( - \\infty ; 2)$<\/span><\/span><\/p>","type":"choose","extra_type":"classic","user_id":"131","test":"0","date":"2022-09-03 12:33:28","option_type":"math","len":0}]}