{"common":{"save":0,"post_id":"1401","level":2,"total":20,"point":5,"point_extra":0},"segment":[{"id":"1171","post_id":"1401","mon_id":"0","chapter_id":"0","question":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","options":{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":" <span class='basic_left'> Bi\u1ec3u th\u1ee9c n\u00e0o sau \u0111\u00e2y l\u00e0 <b> \u0111a th\u1ee9c<\/b> nh\u01b0ng kh\u00f4ng ph\u1ea3i l\u00e0 <b>\u0111\u01a1n th\u1ee9c <\/b>? <\/span>","select":["A. $x^2yz+1$","B. $(a+1)x^3y$ v\u1edbi $a$ l\u00e0 h\u1eb1ng s\u1ed1","C. $\\dfrac{24xyz^2}{5}$","D. $-\\dfrac{x^3}{7}$"],"explain":"<span class='basic_left'> C\u00e1c bi\u1ec3u th\u1ee9c $(a+1)x^3y$ ($a$ l\u00e0 h\u1eb1ng s\u1ed1), $\\dfrac{24xyz^2}{5}$ v\u00e0 $-\\dfrac{x^3}{7}$ v\u1eeba l\u00e0 \u0111\u01a1n th\u1ee9c v\u1eeba l\u00e0 \u0111a th\u1ee9c. <br\/> Bi\u1ec3u th\u1ee9c $x^2yz+1$ l\u00e0 \u0111a th\u1ee9c nh\u01b0ng kh\u00f4ng l\u00e0 \u0111\u01a1n th\u1ee9c.<br\/><span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n l\u00e0 A.<\/span><\/span>","column":2}]}]},"correct":"","level":"2","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:22:56"},{"id":"1172","post_id":"1401","mon_id":"0","chapter_id":"0","question":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","options":{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[2]],"list":[{"point":5,"ques":" <span class='basic_left'> Thu g\u1ecdn \u0111a th\u1ee9c $A=2{{x}^{2}}{{y}^{5}}-xyz+{{y}^{3}}+3{{x}^{2}}{{y}^{5}}-2xyz+7{{y}^{3}}-4{{x}^{2}}{{y}^{5}}$ \u0111\u01b0\u1ee3c k\u1ebft qu\u1ea3 l\u00e0: <\/span>","select":["A. ${{x}^{2}}{{y}^{5}}+3xyz+8{{y}^{3}}$","B. ${{x}^{2}}{{y}^{5}}-3xyz+8{{y}^{3}}$","C. $6{{x}^{2}}{{y}^{5}}-3xyz+8{{y}^{3}}$","D. $6{{x}^{2}}{{y}^{5}}+3xyz+8{{y}^{3}}$"],"hint":" Nh\u00f3m c\u00e1c h\u1ea1ng t\u1eed \u0111\u1ed3ng d\u1ea1ng v\u1edbi nhau r\u1ed3i t\u00ednh.","explain":"<span class='basic_left'> Ta c\u00f3: <br\/> $\\begin{align} & A=2{{x}^{2}}{{y}^{5}}-xyz+{{y}^{3}}+3{{x}^{2}}{{y}^{5}}-2xyz+7{{y}^{3}}-4{{x}^{2}}{{y}^{5}} \\\\ & \\,\\,\\,\\,\\,=\\left( 2{{x}^{2}}{{y}^{5}}+3{{x}^{2}}{{y}^{5}}-4{{x}^{2}}{{y}^{5}} \\right)+\\left( -xyz-2xyz \\right)+\\left( {{y}^{3}}+7{{y}^{3}} \\right) \\\\ & \\,\\,\\,\\,\\,={{x}^{2}}{{y}^{5}}-3xyz+8{{y}^{3}} \\\\ \\end{align}$ <br\/><span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n l\u00e0 B.<\/span><\/span>","column":2}]}]},"correct":"","level":"2","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:22:56"},{"id":"1173","post_id":"1401","mon_id":"0","chapter_id":"0","question":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","options":{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[4]],"list":[{"point":5,"ques":" <span class='basic_left'> \u0110a th\u1ee9c n\u00e0o sau \u0111\u00e2y c\u00f3 b\u1eadc l\u00e0 $5?$ <\/span>","select":["A. $6x^3y-xy^5$","B. $x^2y^2-5xy+4y^4$","C. $5x^2+3$","D. $4x^3y+5x^2y-7y^5$"],"hint":"","explain":"<span class='basic_left'> \u0110a th\u1ee9c $6x^3y-xy^5$ c\u00f3 b\u1eadc l\u00e0 $6$ <br\/> \u0110a th\u1ee9c $x^2y^2-5xy+4y^4$ c\u00f3 b\u1eadc l\u00e0 $4$ <br\/> \u0110a th\u1ee9c $5x^2+3$ c\u00f3 b\u1eadc l\u00e0 $2$ <br\/> \u0110a th\u1ee9c $4x^3y+5x^2y-7y^5$ c\u00f3 b\u1eadc l\u00e0 $5$ <br\/><span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n l\u00e0 D.<\/span><\/span>","column":2}]}]},"correct":"","level":"2","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:22:56"}]}