{"common":{"save":0,"post_id":"1015","level":2,"total":20,"point":5,"point_extra":0},"segment":[{"id":"421","post_id":"1015","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":" T\u00ecm $x$ bi\u1ebft: $5\\sqrt{x} - 17 = 108 ?$ ","select":["A. $x = 50 $","B. $x = 625 $","C. $x = 25$","D. $x = 5$"],"hint":"Chuy\u1ec3n v\u1ebf \u0111\u1ed5i d\u1ea5u. ","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span> <br\/> - Chuy\u1ec3n v\u1ebf <br\/> - \u00c1p d\u1ee5ng: N\u1ebfu $\\sqrt{x} = a (a \\geq 0)$ th\u00ec $x = a^{2}$ <\/span> <br\/> <br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> $5\\sqrt{x} - 17 = 108\\\\ \\Leftrightarrow 5\\sqrt{x} = 17 + 108 = 125 \\\\ \\Leftrightarrow \\sqrt{x} = 125 : 5 = 25 > 0 \\\\ \\Leftrightarrow x = 25^{2} = 625 $ <br\/> <br\/> <span class='basic_pink'> \u0110\u00e1p \u00e1n \u0111\u00fang 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 09:22:47"},{"id":"422","post_id":"1015","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":[[3]],"list":[{"point":5,"ques":" T\u00ecm $x$ bi\u1ebft: $\\sqrt{x} + 1 = 7?$ ","select":["A. $x = 3$ ","B. $x = \\pm 3$","C. $x = 36$","D. $x = \\pm 36 $"],"hint":" Chuy\u1ec3n v\u1ebf \u0111\u1ed5i d\u1ea5u. ","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span> <br\/> - Chuy\u1ec3n v\u1ebf <br\/> - \u00c1p d\u1ee5ng: N\u1ebfu $\\sqrt{x} = a (a \\geq 0)$ th\u00ec $x = a^{2}$ <\/span> <br\/> <br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> $\\sqrt{x} + 1 = 7 \\\\ \\Leftrightarrow \\sqrt{x} = 7 - 1 = 6 > 0 \\\\ \\Leftrightarrow x = 6^{2} = 36 $ <br\/> <br\/> <span class='basic_pink'> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 C. <\/span><\/span> ","column":2}]}]},"correct":"","level":"2","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:22:47"},{"id":"423","post_id":"1015","mon_id":"0","chapter_id":"0","question":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o \u00f4 tr\u1ed1ng","options":{"time":24,"part":[{"title":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["-6"]]],"list":[{"point":5,"width":50,"type_input":"","ques":" Gi\u00e1 tr\u1ecb c\u1ee7a bi\u1ec3u th\u1ee9c $ A = \\sqrt{121} - \\sqrt{400} + \\sqrt{(-3)^{2}} $= _input_ ","hint":" T\u00ednh c\u0103n b\u1eadc hai c\u1ee7a c\u00e1c s\u1ed1 r\u1ed3i th\u1ef1c hi\u1ec7n ph\u00e9p t\u00ednh ","explain":" Ta c\u00f3: A = $ \\sqrt{121} - \\sqrt{400} + \\sqrt{(-3)^{2}} \\\\ = \\sqrt{11^{2}} - \\sqrt{20^{2}} + \\sqrt{(-3)^{2}} \\\\ = 11 - 20 + 3 \\\\ = -6 $<br\/> <br\/> <span class='basic_pink'> V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u00e0 -6. <\/span><\/span>"}]}]},"correct":"","level":"2","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:22:47"}]}