{"common":{"save":0,"post_id":"1396","level":3,"total":10,"point":10,"point_extra":0},"segment":[{"id":"1091","post_id":"1396","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":10,"ques":"<span class='basic_left'> Bi\u1ec3u th\u1ee9c n\u00e0o sau \u0111\u00e2y bi\u1ec3u th\u1ecb chu vi c\u1ee7a m\u1ed9t tam gi\u00e1c c\u00e2n c\u00f3 c\u1ea1nh b\u00ean b\u1eb1ng $a$ v\u00e0 c\u1ea1nh \u0111\u00e1y b\u1eb1ng $b.$ <\/span>","select":["A. $2a+b$","B. $2(a+b)$","C. $a+2b$ ","D. $2ab$"],"explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> Chu vi tam gi\u00e1c b\u1ea5t k\u00ec b\u1eb1ng t\u1ed5ng \u0111\u1ed9 d\u00e0i ba c\u1ea1nh c\u1ee7a n\u00f3. <br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>Chu vi m\u1ed9t tam gi\u00e1c c\u00e2n c\u00f3 c\u1ea1nh b\u00ean b\u1eb1ng $a,$ c\u1ea1nh \u0111\u00e1y b\u1eb1ng $b$ vi\u1ebft th\u00e0nh bi\u1ec3u th\u1ee9c \u0111\u1ea1i s\u1ed1 l\u00e0: $a+a+b=2a+b$ <br\/><span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n l\u00e0 A.<\/span> <\/span>","column":2}]}]},"correct":"","level":"3","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:22:55"},{"id":"1092","post_id":"1396","mon_id":"0","chapter_id":"0","question":"Kh\u1eb3ng \u0111\u1ecbnh sau \u0111\u00e2y \u0110\u00fang hay Sai","options":{"time":24,"part":[{"title":"Kh\u1eb3ng \u0111\u1ecbnh sau \u0111\u00e2y \u0110\u00fang hay Sai","title_trans":"","temp":"multiple_choice","correct":[[2]],"list":[{"point":10,"ques":" <span class='basic_left'> Bi\u1ec3u th\u1ee9c $(a-b)^2(a^2+b^2)$ di\u1ec5n \u0111\u1ea1t b\u1eb1ng l\u1eddi l\u00e0: <b> T\u00edch c\u1ee7a hi\u1ec7u $a$ v\u00e0 $b$ b\u00ecnh ph\u01b0\u01a1ng v\u1edbi t\u1ed5ng c\u00e1c b\u00ecnh ph\u01b0\u01a1ng c\u1ee7a $a$ v\u00e0 $b$ <\/b> <\/span>","select":["\u0110\u00fang","Sai "],"explain":"<span class='basic_left'> Bi\u1ec3u th\u1ee9c $(a-b)^2(a^2+b^2)$ di\u1ec5n \u0111\u1ea1t b\u1eb1ng l\u1eddi l\u00e0: <b> T\u00edch c\u1ee7a b\u00ecnh ph\u01b0\u01a1ng c\u1ee7a hi\u1ec7u $a$ v\u00e0 $b$ v\u1edbi t\u1ed5ng c\u00e1c b\u00ecnh ph\u01b0\u01a1ng c\u1ee7a $a$ v\u00e0 $b$ <\/b> <br\/> $\\Rightarrow$ Kh\u1eb3ng \u0111\u1ecbnh tr\u00ean l\u00e0 sai. <br\/><span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n l\u00e0 Sai.<\/span><\/span>","column":2}]}]},"correct":"","level":"3","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:22:55"},{"id":"1093","post_id":"1396","mon_id":"0","chapter_id":"0","question":"\u0110i\u1ec1n k\u1ebft qu\u1ea3 \u0111\u00fang nh\u1ea5t v\u00e0o \u00f4 tr\u1ed1ng","options":{"time":24,"part":[{"title":"\u0110i\u1ec1n k\u1ebft qu\u1ea3 \u0111\u00fang nh\u1ea5t v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["0"]]],"list":[{"point":10,"width":40,"content":"","type_input":"","ques":" <span class='basic_left'> T\u00ednh gi\u00e1 tr\u1ecb c\u1ee7a bi\u1ec3u th\u1ee9c $F=\\dfrac{3a-5}{2a+b}-\\dfrac{4b+5}{a+3b}$ v\u1edbi $a-b=5$ <br\/> <b> \u0110\u00e1p \u00e1n: <\/b> $F=\\FormInput[40][bl_elm_true basic_elm basic_blank basic_blank_part]{}$ <\/span>","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> T\u1eeb $a-b=5$ r\u00fat $a$ theo $b$ <br\/> \u0110\u01b0a $F$ v\u1ec1 bi\u1ec3u th\u1ee9c ch\u1ec9 ch\u1ee9a bi\u1ebfn $b$ <br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> T\u1eeb $a-b=5 \\Rightarrow a=b+5$ <br\/> Khi \u0111\u00f3 ta c\u00f3: <br\/> $\\begin{align} & F=\\dfrac{3\\left( b+5 \\right)-5}{2(b+5)+b}-\\dfrac{4b+5}{(b+5)+3b} \\\\ & \\,\\,\\,\\,=\\dfrac{3b+15-5}{2b+10+b}-\\dfrac{4b+5}{b+5+3b} \\\\ & \\,\\,\\,\\,=\\dfrac{3b+10}{3b+10}-\\dfrac{4b+5}{4b+5} \\\\ & \\,\\,\\,\\,=1-1 \\\\ & \\,\\,\\,\\,=0 \\\\ \\end{align}$ <br\/> <span class='basic_pink'> V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n v\u00e0o \u00f4 tr\u1ed1ng l\u00e0 $0$ <\/span><\/span>"}]}]},"correct":"","level":"3","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:22:55"}]}