{"common":{"save":0,"post_id":"788","level":3,"total":10,"point":10,"point_extra":0},"segment":[{"id":"1381","post_id":"788","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":[[["60","+60"]]],"list":[{"point":10,"width":60,"type_input":"","ques":"<center><img src='img\/2.jpg' \/><\/center>B\u1ecf ngo\u1eb7c r\u1ed3i t\u00ednh:<br\/> -[-19 + (-28 + 10)] - (-23) = _input_","hint":"","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/>+ Khi d\u1ea5u ngo\u1eb7c c\u00f3 d\u1ea5u (-) \u0111\u1eb1ng tr\u01b0\u1edbc, ta ph\u1ea3i \u0111\u1ed5i d\u1ea5u t\u1ea5t c\u1ea3 c\u00e1c s\u1ed1 h\u1ea1ng trong d\u1ea5u ngo\u1eb7c: d\u1ea5u (+) th\u00e0nh d\u1ea5u (-) v\u00e0 d\u1ea5u (-) th\u00e0nh d\u1ea5u (+)<br\/>+ Khi b\u1ecf d\u1ea5u ngo\u1eb7c c\u00f3 d\u1ea5u (+) \u0111\u1eb1ng tr\u01b0\u1edbc th\u00ec d\u1ea5u c\u00e1c s\u1ed1 h\u1ea1ng trong ngo\u1eb7c v\u1eabn gi\u1eef nguy\u00ean<\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>Ta c\u00f3: <br\/>$\\begin{align*}&-[-19 + (-28 + 10)] - (-23) \\\\&= -(-19 - 28 + 10) + 23\\\\&= 19 + 28 - 10 + 23\\\\&= (19 + 28 + 23) - 10\\\\&= (47 + 23) - 10\\\\&= 70 - 10\\\\&= 60\\end{align*}$<br\/>V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n v\u00e0o \u00f4 tr\u1ed1ng l\u00e0: <span class='basic_pink'> 60<\/span><\/span> <br\/> "}]}]},"correct":"","level":"3","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:14:51"},{"id":"1382","post_id":"788","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":[[1]],"list":[{"point":10,"ques":" T\u00ednh b\u1eb1ng c\u00e1ch h\u1ee3p l\u00fd:<br\/>37.(63 - 19) - 63.(5 + 37) = <span class='basic_hoi_black'>?<\/span>","select":["A. -1018","B. 1018","C. -1108","D. -1801"],"hint":" ","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> B\u1ecf ngo\u1eb7c r\u1ed3i t\u00ednh m\u1ed9t c\u00e1ch th\u00edch h\u1ee3p<\/span><br\/><span class='basic_left'><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>$\\begin{align*}&37.(63 - 19) - 63.(5 + 37)\\\\&= 37.63 - 37.19 -63.5 - 63.37 \\\\&= -(37 . 19 + 63 . 5) + (37.63 - 63.37)\\\\&= - (703 + 315) + 0\\\\&= -1018\\end{align*}$<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: <span class='basic_pink'> A. -1018<\/span><\/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 09:14:51"},{"id":"1383","post_id":"788","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":[[["-4"],["9"],["1"]]],"list":[{"point":10,"width":60,"type_input":"","ques":"T\u00ecm c\u00e1c s\u1ed1 x, y, z bi\u1ebft: x + y = 5, y + z = 10, z + x = -3<br\/>x = _input_, y = _input_, z = _input_","hint":"","explain":"<span class='basic_left'><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>Ta c\u00f3:<br\/>$\\begin{align*}x + y + y + z + z + x&=5 + 10 + (-3)\\$x + x) + (y + y) + (z + z)&= 15 - 3\\\\2x + 2y + 2z&= 12\\\\2. (x + y + z)&= 12\\\\x + y + z&= 12 : 2\\\\x + y + z&= 6\\end{align*}$<br\/>+)<br\/> $\\begin{align*}(x + y + z) - (x + y)&=6 - 5\\\\z&= 1 \\end{align*}$<br\/>+)<br\/> $\\begin{align*}(x + y + z) - (y + z)&=6 - 10\\\\x&= - (10 - 6)\\\\x&= -4 \\end{align*}$<br\/>+)<br\/>$\\begin{align*}(x + y + z) - (z + x)&=6 - (-3)\\\\y&= 6 + 3\\\\y&= 9 \\end{align*}$<br\/>V\u1eady c\u00e1c s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u1ea7n l\u01b0\u1ee3t t\u1eeb tr\u00e1i qua ph\u1ea3i l\u00e0: <span class='basic_pink'> -4; 9; 1<\/span><\/span> <br\/><\/span> "}]}]},"correct":"","level":"3","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:14:51"}]}