{"common":{"save":0,"post_id":"773","level":3,"total":10,"point":10,"point_extra":0},"segment":[{"id":"1131","post_id":"773","mon_id":"0","chapter_id":"0","question":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 tr\u1ed1ng","options":{"time":24,"part":[{"title":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["330"," 330","+330","+ 330"," 330 "]]],"list":[{"point":10,"width":60,"type_input":"","ques":"<center><img src='img\/2.jpg' \/><\/center>124 - (135 - 341) = _input_","hint":"","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> Bi\u1ec3u th\u1ee9c c\u00f3 ch\u1ee9a d\u1ea5u ngo\u1eb7c () n\u00ean ta th\u1ef1c hi\u1ec7n t\u00ednh trong ngo\u1eb7c tr\u01b0\u1edbc<br\/><b>L\u01b0u \u00fd:<\/b><br\/>Mu\u1ed1n tr\u1eeb s\u1ed1 nguy\u00ean a cho s\u1ed1 nguy\u00ean b, ta c\u1ed9ng a v\u1edbi s\u1ed1 \u0111\u1ed1i c\u1ee7a b<br\/><b>a - b = a + (-b)<\/b><\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>$\\begin{align*}124 - (135 - 341)&= 124 -[135 + (-341)]\\\\&= 124 - [-(341 - 135)]\\\\&= 124 - (-206)\\\\&= 124 + 206\\\\&= 330\\end{align*}$<br\/>V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n v\u00e0o \u00f4 tr\u1ed1ng l\u00e0: <span class='basic_pink'> 330<\/span><\/span> <br\/> "}]}]},"correct":"","level":"3","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:14:49"},{"id":"1132","post_id":"773","mon_id":"0","chapter_id":"0","question":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 tr\u1ed1ng","options":{"time":24,"part":[{"title":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["-136"," -136","- 136","-136 "," -136 "]]],"list":[{"point":10,"width":60,"type_input":"","ques":"<center><img src='img\/2.jpg' \/><\/center>-330 - (285 - 479) = _input_","hint":"","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> Bi\u1ec3u th\u1ee9c c\u00f3 ch\u1ee9a d\u1ea5u ngo\u1eb7c () n\u00ean ta th\u1ef1c hi\u1ec7n t\u00ednh trong ngo\u1eb7c tr\u01b0\u1edbc<br\/><b>L\u01b0u \u00fd:<\/b><br\/>Mu\u1ed1n tr\u1eeb s\u1ed1 nguy\u00ean a cho s\u1ed1 nguy\u00ean b, ta c\u1ed9ng a v\u1edbi s\u1ed1 \u0111\u1ed1i c\u1ee7a b<br\/><b>a - b = a + (-b)<\/b><\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>$\\begin{align*}-330 - (285 - 479)&= -330 -[285 + (-479)]\\\\&= -330 - [-(479 - 285)]\\\\&= -330 - (-194)\\\\&= (-330) + 194\\\\&= - (330 - 194)\\\\&= -136\\end{align*}$<br\/>V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n v\u00e0o \u00f4 tr\u1ed1ng l\u00e0: <span class='basic_pink'> -136<\/span><\/span> <br\/> "}]}]},"correct":"","level":"3","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:14:49"},{"id":"1133","post_id":"773","mon_id":"0","chapter_id":"0","question":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","options":{"time":14,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[4]],"list":[{"point":10,"ques":" T\u00ecm x, bi\u1ebft:<br\/> |x - 5| = 3 ","select":["A. x = 8","B. x = 2","C. x = 3","D. C\u1ea3 A v\u00e0 B \u0111\u1ec1u \u0111\u00fang"],"hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> Kho\u1ea3ng c\u00e1ch t\u1eeb \u0111i\u1ec3m a \u0111\u1ebfn \u0111i\u1ec3m 0 tr\u00ean tr\u1ee5c s\u1ed1 l\u00e0 gi\u00e1 tr\u1ecb tuy\u1ec7t \u0111\u1ed1i c\u1ee7a s\u1ed1 nguy\u00ean a.<br\/><b> L\u01b0u \u00fd: <\/b> <b><i> x \u1edf v\u1ecb tr\u00ed l\u00e0 s\u1ed1 b\u1ecb tr\u1eeb, mu\u1ed1n t\u00ecm s\u1ed1 b\u1ecb tr\u1eeb ta l\u1ea5y hi\u1ec7u c\u1ed9ng v\u1edbi s\u1ed1 tr\u1eeb<\/i><\/b><\/span> <br\/><br\/><span class='basic_left'><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>|x - 5| = 3 <br\/>$\\Rightarrow $ x - 5 = 3 ho\u1eb7c x - 5 = -3<br\/>TH1: <br\/> $\\begin{align*}x - 5&= 3\\\\x&= 3 + 5\\\\x&= 8\\end{align*}$<br\/>TH2:<br\/> $\\begin{align*}x - 5&= -3\\\\x&= -3 + 5\\\\x&= 2\\end{align*}$<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: <span class='basic_pink'> D. C\u1ea3 A v\u00e0 B \u0111\u1ec1u \u0111\u00fang<\/span><br\/><span class='basic_green'>Nh\u1eadn x\u00e9t:<\/span> |a| = a ho\u1eb7c = -a<br\/>+ |a| = a n\u1ebfu a > 0 (V\u00ed d\u1ee5 |2| = 2) <br\/>+ |a| = -a n\u1ebfu a < 0 (V\u00ed d\u1ee5: |-2| = -(-2) = 2)<\/span> <br\/><\/span>","column":2}]}]},"correct":"","level":"3","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:14:49"}]}