{"common":{"save":0,"post_id":"6717","level":1,"total":10,"point":10,"point_extra":0},"segment":[{"id":"7412","mon_id":"1158767","chapter_id":"1158801","post_id":"6717","question":"<p>\u0110i\u1ec3m nào thu\u1ed9c \u0111\u1ed3 th\u1ecb hàm s\u1ed1 <span class=\"math-tex\">$y=\\dfrac{x+1}{x(x-2)}$<\/span> ?<\/p>","options":["<strong>A.<\/strong> (2 ; 1)","<strong>B.<\/strong> (–1 ; 0)","<strong>C.<\/strong> (2 ; 0)","<strong>D.<\/strong> (0 ; 1)"],"correct":"2","level":"1","hint":"","answer":"<p>\u0110\u1eb7t <span class=\"math-tex\">$y=f(x)=\\dfrac{x+1}{x(x-2)}$<\/span> .<\/p><p>Ta th\u1ea5y <span class=\"math-tex\">$f(-1)=\\dfrac{-1+1}{-1(-1-2)}=0$<\/span> <\/p><p>nên \u0111i\u1ec3m thu\u1ed9c \u0111\u1ed3 th\u1ecb hàm s\u1ed1 \u0111ã cho là <span style=\"color:#16a085;\"> <strong>B.<\/strong> (–1 ; 0).<\/span><\/p>","type":"choose","extra_type":"classic","user_id":"131","test":"0","date":"2023-10-01 21:22:19","option_type":"txt","len":2},{"id":"7416","mon_id":"1158767","chapter_id":"1158801","post_id":"6717","question":"<p>T\u1ecda \u0111\u1ed9 giao \u0111i\u1ec3m c\u1ee7a \u0111\u01b0\u1eddng th\u1eb3ng <span class=\"math-tex\">$(d):y=x-1$<\/span> và parabol <span class=\"math-tex\">$(P):y=x^2-2x-1$<\/span> là<\/p>","options":["<strong>A.<\/strong> <span class=\"math-tex\">$(1;-1),(3;2)$<\/span>","<strong>B.<\/strong> <span class=\"math-tex\">$(0;1),(3;2)$<\/span>","<strong>C.<\/strong> <span class=\"math-tex\">$(0;-1),(3;2)$<\/span>","<strong>D.<\/strong> <span class=\"math-tex\">$(1;-1),(-3;2)$<\/span>"],"correct":"3","level":"1","hint":"","answer":"<p>Ph\u01b0\u01a1ng trình hoành \u0111\u1ed9 giao \u0111i\u1ec3m c\u1ee7a (d) và (P) là<\/p><p><span class=\"math-tex\">$x^2-2x-1=x-1$<\/span> <\/p><p>⇔ <span class=\"math-tex\">$x^2-3x=0$<\/span> <\/p><p>⇔ <span class=\"math-tex\">$x=0$<\/span> ho\u1eb7c <span class=\"math-tex\">$x=3$<\/span> .<\/p><p>V\u1edbi x = 0 thì y = 0 – 1 = –1 ⇒ (0 ; –1).<\/p><p>V\u1edbi x = 3 thì y = 3 – 1 = 2 ⇒ (3 ; 2).<\/p><p>V\u1eady t\u1ecda \u0111\u1ed9 giao \u0111i\u1ec3m là <span style=\"color:#16a085;\"> <strong>C.<\/strong> <span class=\"math-tex\">$(0;-1),(3;2)$<\/span> .<\/span><\/p>","type":"choose","extra_type":"classic","user_id":"131","test":"0","date":"2023-10-01 21:27:42","option_type":"math","len":0},{"id":"7417","mon_id":"1158767","chapter_id":"1158801","post_id":"6717","question":"<p>Cho parabol <span class=\"math-tex\">$(P):y=x^2-2x+4$<\/span> . Tìm \u0111i\u1ec3m mà parabol \u0111i qua.<\/p>","options":["<strong>A.<\/strong> <span class=\"math-tex\">$Q(4;2)$<\/span>","<strong>B.<\/strong> <span class=\"math-tex\">$N(-3;1)$<\/span>","<strong>C.<\/strong> <span class=\"math-tex\">$P(4;0)$<\/span>","<strong>D.<\/strong> <span class=\"math-tex\">$M(-3;19)$<\/span>"],"correct":"4","level":"1","hint":"","answer":"<p>Ta th\u1ea5y v\u1edbi x = –3 thì y = <span class=\"math-tex\">$(-3)^2-2.(-3)+4$<\/span> = 19<\/p><p>nên \u0111i\u1ec3m mà parabol \u0111i qua là <span style=\"color:#16a085;\"><strong>D.<\/strong> <span class=\"math-tex\">$M(-3;19)$<\/span> .<\/span><\/p>","type":"choose","extra_type":"classic","user_id":"131","test":"0","date":"2023-10-01 21:31:10","option_type":"math","len":0}]}
