{"common":{"save":0,"post_id":"6548","level":2,"total":10,"point":10,"point_extra":0},"segment":[{"id":"5847","post_id":"6548","mon_id":"1158921","chapter_id":"1158928","question":"<p>Khai tri\u1ec3n <span class=\"math-tex\">$\\bigg(x-\\dfrac{1}{2}\\bigg)^3$<\/span> ta \u0111\u01b0\u1ee3c<\/p>","options":["<strong>A.<\/strong> <span class=\"math-tex\">$x^3 + \\dfrac{3}{2}x^2-\\dfrac{3}{4}x+\\dfrac{1}{8}$<\/span>","<strong>B.<\/strong> <span class=\"math-tex\">$x^3 + \\dfrac{3}{4}x^2-\\dfrac{3}{2}x-\\dfrac{1}{8}$<\/span>","<strong>C.<\/strong> <span class=\"math-tex\">$x^3 -\\dfrac{3}{4}x^2-\\dfrac{3}{2}x+\\dfrac{1}{8}$<\/span>","<strong>D.<\/strong> <span class=\"math-tex\">$x^3 -\\dfrac{3}{2}x^2+\\dfrac{3}{4}x-\\dfrac{1}{8}$<\/span>"],"correct":"4","level":"2","hint":"<p>(A – B)³ = A³ – 3A²B + 3AB² – B³ .<\/p>","answer":"<p><span class=\"math-tex\">$\\bigg(x-\\dfrac{1}{2}\\bigg)^3$<\/span> = <span class=\"math-tex\">$x^3-3.x^2.\\dfrac{1}{2}+3.x.\\bigg(\\dfrac{1}{2}\\bigg)^2-\\bigg(\\dfrac{1}{2}\\bigg)^3$<\/span> <\/p><p>= <span class=\"math-tex\">$x^3-\\dfrac{3}{2}x^2+\\dfrac{3}{4}x-\\dfrac{1}{8}$<\/span> .<\/p><p>\u0110áp án \u0111úng là <span style=\"color:#16a085;\"><strong>D.<\/strong> <span class=\"math-tex\">$x^3 -\\dfrac{3}{2}x^2+\\dfrac{3}{4}x-\\dfrac{1}{8}$<\/span>.<\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"0","date":"2023-07-04 14:18:17","option_type":"math","len":0},{"id":"5849","post_id":"6548","mon_id":"1158921","chapter_id":"1158928","question":"<p>Khai tri\u1ec3n (2x + 1)³ ta \u0111\u01b0\u1ee3c<\/p>","options":["<strong>A.<\/strong> 8x³ + 6x² + 6x + 1","<strong>B.<\/strong> 8x³ + 12x² + 6x + 1","<strong>C.<\/strong> 8x³ + 12x² + 12x + 1","<strong>D.<\/strong> 8x³ + 8x² + 6x + 1"],"correct":"2","level":"2","hint":"<p>(A + B)³ = A³ + 3A²B + 3AB² + B³ .<\/p>","answer":"<p>(2x + 1)³ = (2x)³ + 3.(2x)².1 + 3.2x.1² + 1³<\/p><p>= 8x³ + 12x² + 6x + 1 .<\/p><p>\u0110áp án \u0111úng là <span style=\"color:#16a085;\"><strong>B.<\/strong> 8x³ + 12x² + 6x + 1.<\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"0","date":"2023-07-04 14:21:25","option_type":"txt","len":2},{"id":"5851","post_id":"6548","mon_id":"1158921","chapter_id":"1158928","question":"<p>Khai tri\u1ec3n (3x – 1)³ ta \u0111\u01b0\u1ee3c<\/p>","options":["<strong>A.<\/strong> 27x³ – 27x² + 9x – 1","<strong>B.<\/strong> 27x³ – 27x² – 9x – 1","<strong>C.<\/strong> 27x³ – 9x² + 9x – 1","<strong>D.<\/strong> 27x³ + 27x² + 9x – 1"],"correct":"1","level":"2","hint":"<p>(A – B)³ = A³ – 3A²B + 3AB² – B³ <\/p>","answer":"<p>(3x – 1)³ = (3x)³ – 3.(3x)².1 + 3.3x.1² – 1³<\/p><p>= 27x³ – 27x² + 9x – 1 .<\/p><p>\u0110áp án \u0111úng là <span style=\"color:#16a085;\"><strong>A.<\/strong> 27x³ – 27x² + 9x – 1.<\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"0","date":"2023-07-04 14:25:05","option_type":"txt","len":3}]}
