{"common":{"save":0,"post_id":"6530","level":2,"total":10,"point":10,"point_extra":0},"segment":[{"id":"5678","post_id":"6530","mon_id":"1158921","chapter_id":"1158927","question":"<p>T&igrave;m b\u1eadc c\u1ee7a \u0111a th\u1ee9c&nbsp;<span class=\"math-tex\">$15x^2-2xyz+7x^2-8yz+2xyz$<\/span>.<\/p>","options":["3","2","5","15"],"correct":"2","level":"2","hint":"<p>B\u1eadc c\u1ee7a m\u1ed9t \u0111a th\u1ee9c l&agrave; b\u1eadc c\u1ee7a h\u1ea1ng t\u1eed c&oacute; b\u1eadc cao nh\u1ea5t trong d\u1ea1ng thu g\u1ecdn c\u1ee7a \u0111a th\u1ee9c \u0111&oacute;.<\/p>","answer":"<p>Ta thu g\u1ecdn \u0111a th\u1ee9c:<\/p><p><span class=\"math-tex\">$15x^2-2xyz+7x^2-8yz+2xyz$<\/span><\/p><p>=&nbsp;<span class=\"math-tex\">$22x^2-8yz$<\/span><\/p><p>C\u1ea3 hai h\u1ea1ng t\u1eed c\u1ee7a \u0111a th\u1ee9c \u0111\u1ec1u c&oacute; b\u1eadc l&agrave; 2 n&ecirc;n b\u1eadc c\u1ee7a \u0111a th\u1ee9c l&agrave; 2.<\/p><p>Ch\u1ecdn&nbsp;<strong><span style=\"color:#16a085;\">2<\/span>.<\/strong><\/p>","type":"choose","extra_type":"flower","time":"0","user_id":"131","test":"0","date":"2023-06-28 11:27:34","option_type":"txt","len":0},{"id":"5680","post_id":"6530","mon_id":"1158921","chapter_id":"1158927","question":"<p>T&igrave;m b\u1eadc c\u1ee7a \u0111a th\u1ee9c&nbsp;<span class=\"math-tex\">$2x^3-3xy+5y^2+x^3-4xy-y^2-2y^2-x^4$<\/span>.<\/p>","options":["<b>A. <\/b>3","<strong>B. <\/strong>5","<strong>C. <\/strong>4","<strong>D. <\/strong>2"],"correct":"3","level":"2","hint":"<p>B\u1eadc c\u1ee7a m\u1ed9t \u0111a th\u1ee9c l&agrave; b\u1eadc c\u1ee7a h\u1ea1ng t\u1eed c&oacute; b\u1eadc cao nh\u1ea5t trong d\u1ea1ng thu g\u1ecdn c\u1ee7a \u0111a th\u1ee9c \u0111&oacute;.<\/p>","answer":"<p>Ta thu g\u1ecdn \u0111a th\u1ee9c&nbsp;<\/p><p><span class=\"math-tex\">$2x^3-3xy+5y^2+x^3-4xy-y^2-2y^2-x^4$<\/span><\/p><p>=&nbsp;<span class=\"math-tex\">$3x^3-7xy+2y^2-x^4$<\/span><\/p><p>H\u1ea1ng t\u1eed&nbsp;<span class=\"math-tex\">$3x^3$<\/span>&nbsp;c&oacute; b\u1eadc 3, hai h\u1ea1ng t\u1eed&nbsp;<span class=\"math-tex\">$-7xy;2y^2$<\/span>&nbsp;\u0111\u1ec1u c&oacute; b\u1eadc 2, h\u1ea1ng t\u1eed&nbsp;<span class=\"math-tex\">$-x^4$<\/span>&nbsp;c&oacute; b\u1eadc <span style=\"color:#16a085;\"><strong>4<\/strong><\/span>.<\/p><p>V\u1eady b\u1eadc c\u1ee7a \u0111a th\u1ee9c l&agrave; 4.<\/p><p>Ch\u1ecdn <span style=\"color:#16a085;\"><strong>C.&nbsp;<\/strong>4<\/span>.<\/p>","type":"choose","extra_type":"shape2","time":"0","user_id":"131","test":"0","date":"2023-06-28 11:30:59","option_type":"txt","len":0},{"id":"5682","post_id":"6530","mon_id":"1158921","chapter_id":"1158927","question":"<p>T&iacute;nh gi&aacute; tr\u1ecb c\u1ee7a \u0111a th\u1ee9c sau t\u1ea1i x = 1, y = &ndash;2.<\/p><p><span class=\"math-tex\">$x^2y+\\dfrac{1}{4}xy^2-xy+10x$<\/span><\/p>","options":["11","10","2","&ndash;2"],"correct":"1","level":"2","hint":"","answer":"<p>T\u1ea1i x = 1, y = &ndash;2 ta c&oacute;:<\/p><p><span class=\"math-tex\">$1^2.(-2)+\\dfrac{1}{4}.1.(-2)^2-1.(-2)+10.1=11$<\/span><\/p><p>Ch\u1ecdn <span style=\"color:#16a085;\"><strong>11<\/strong><\/span>.<\/p>","type":"choose","extra_type":"shape1","time":"0","user_id":"131","test":"0","date":"2023-06-28 11:34:35","option_type":"txt","len":0}]}