{"common":{"save":0,"post_id":"978","level":3,"total":10,"point":10,"point_extra":0},"segment":[{"id":"801","post_id":"978","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":10,"ques":"Cho h\u00e0m s\u1ed1 $y = \\dfrac{-1}{2}x $ c\u00f3 \u0111\u1ed3 th\u1ecb l\u00e0 \u0111\u01b0\u1eddng th\u1eb3ng d v\u00e0 c\u00e1c \u0111i\u1ec3m $M(0 ; 0), N\\left(\\dfrac{1}{2}; \\dfrac{-1}{4} \\right),$$ G(4; -2), H\\left(\\dfrac{-1}{3}; \\dfrac{-1}{6} \\right), E\\left(\\sqrt{2}; \\dfrac{-\\sqrt{2}}{2} \\right), F(2; 1) . $ Trong c\u00e1c \u0111i\u1ec3m \u0111\u00e3 cho \u0111i\u1ec3m n\u00e0o thu\u1ed9c \u0111\u1ed3 th\u1ecb h\u00e0m s\u1ed1? ","select":["A. \u0110i\u1ec3m M v\u00e0 N ","B. \u0110i\u1ec3m M v\u00e0 H ","C. \u0110i\u1ec3m E v\u00e0 F ","D. \u0110i\u1ec3m M, N, G, E "],"explain":" <span class='basic_left'> $\\bullet $ Thay $x = 0 $ v\u00e0o $y = \\dfrac{-1}{2}x $ ta \u0111\u01b0\u1ee3c $y = \\dfrac{-1}{2}.0 = 0 $ <br\/> $\\Rightarrow $ \u0111i\u1ec3m $M(0; 0)$ thu\u1ed9c \u0111\u1ed3 th\u1ecb h\u00e0m s\u1ed1 $y = \\dfrac{-1}{2}x $ <br\/> $\\bullet $ Thay $x = \\dfrac{1}{2} $ v\u00e0o $y = \\dfrac{-1}{2}x $ ta \u0111\u01b0\u1ee3c $y = \\dfrac{-1}{2}.\\dfrac{1}{2} = \\dfrac{-1}{4} $ <br\/> $\\Rightarrow $ \u0111i\u1ec3m $N\\left(\\dfrac{1}{2}; \\dfrac{-1}{4} \\right)$ thu\u1ed9c \u0111\u1ed3 th\u1ecb h\u00e0m s\u1ed1 $y = \\dfrac{-1}{2}x $ <br\/> $\\bullet $ Thay $x = 4 $ v\u00e0o $y = \\dfrac{-1}{2}x $ ta \u0111\u01b0\u1ee3c $y = \\dfrac{-1}{2}.4 = -2 $ <br\/> $\\Rightarrow $ \u0111i\u1ec3m $G(4; -2)$ thu\u1ed9c \u0111\u1ed3 th\u1ecb h\u00e0m s\u1ed1 $y = \\dfrac{-1}{2}x $ <br\/> $\\bullet $ Thay $x = \\dfrac{-1}{3} $ v\u00e0o $y = \\dfrac{-1}{2}x $ ta \u0111\u01b0\u1ee3c $y = \\dfrac{-1}{2}.\\dfrac{-1}{3} = \\dfrac{1}{6} \\neq \\dfrac{-1}{6} $ <br\/> $\\Rightarrow $ \u0111i\u1ec3m $H\\left(\\dfrac{-1}{3}; \\dfrac{-1}{6} \\right)$ kh\u00f4ng thu\u1ed9c \u0111\u1ed3 th\u1ecb h\u00e0m s\u1ed1 $y = \\dfrac{-1}{2}x $ <br\/> $\\bullet $ Thay $x = \\sqrt{2} $ v\u00e0o $y = \\dfrac{-1}{2}x $ ta \u0111\u01b0\u1ee3c $y = \\dfrac{-1}{2}.\\sqrt{2} = \\dfrac{-\\sqrt{2}}{2} $ <br\/> $\\Rightarrow $ \u0111i\u1ec3m $E\\left(\\sqrt{2}; \\dfrac{-\\sqrt{2}}{2} \\right)$ thu\u1ed9c \u0111\u1ed3 th\u1ecb h\u00e0m s\u1ed1 $y = \\dfrac{-1}{2}x $ <br\/> $\\bullet $ Thay $x = 2 $ v\u00e0o $y = \\dfrac{-1}{2}x $ ta \u0111\u01b0\u1ee3c $y = \\dfrac{-1}{2}.2 = -1 \\neq 1 $ <br\/> $\\Rightarrow $ \u0111i\u1ec3m $F(2; 1)$ kh\u00f4ng thu\u1ed9c \u0111\u1ed3 th\u1ecb h\u00e0m s\u1ed1 $y = \\dfrac{-1}{2}x $ <br\/> V\u1eady c\u00f3 4 b\u1ed1n \u0111i\u1ec3m $M, N, G, E$ thu\u1ed9c \u0111\u1ed3 th\u1ecb c\u1ee7a h\u00e0m s\u1ed1 \u0111\u00e3 cho. <br\/><br\/> <span class='basic_pink'> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 D. <\/span><br\/>","column":2}]}]},"correct":"","level":"3","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:22:51"},{"id":"802","post_id":"978","mon_id":"0","chapter_id":"0","question":"V\u1ebd \u0111\u1ed3 th\u1ecb h\u00e0m s\u1ed1.","options":{"time":14,"part":[{"title":"V\u1ebd \u0111\u1ed3 th\u1ecb h\u00e0m s\u1ed1.","title_trans":"\u0110\u1ec1 chung cho hai c\u00e2u ","temp":"coordinates","correct":[["1,-3","0.5,-1.5","1.5,-4.5","-1,3","-0.5,1.5","-1.5,4.5"]],"list":[{"point":10,"toa_do":[["0","0",""]],"is_click":1,"name_toado_click":"A","draw_line":1,"ques":"Cho h\u00e0m s\u1ed1 $y = (1 - 4a)x $ c\u00f3 \u0111\u1ed3 th\u1ecb \u0111i qua \u0111i\u1ec3m $A(-2; 6).$ <br\/> <u> C\u00e2u 1: <\/u> Vi\u1ebft c\u00f4ng th\u1ee9c v\u00e0 v\u1ebd \u0111\u1ed3 th\u1ecb c\u1ee7a h\u00e0m s\u1ed1 n\u00f3i tr\u00ean. <br\/> <br\/>_inputduongthang_ <br\/> H\u00e3y click th\u00eam m\u1ed9t \u0111i\u1ec3m thu\u1ed9c \u0111\u1ed3 th\u1ecb \u0111\u1ec3 v\u1ebd \u0111\u1ed3 th\u1ecb h\u00e0m s\u1ed1.","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/>- T\u00ecm a \u0111\u1ec3 \u0111\u1ed3 th\u1ecb h\u00e0m s\u1ed1 \u0111i qua \u0111i\u1ec3m $A(-2; 6)$ <br\/> - Thay a v\u1eeba t\u00ecm \u0111\u01b0\u1ee3c v\u00e0o h\u00e0m s\u1ed1 \u0111\u1ec3 \u0111\u01b0\u1ee3c c\u00f4ng th\u1ee9c c\u1ee7a h\u00e0m s\u1ed1 \u0111\u00e3 cho. <br\/> - V\u1ebd \u0111\u1ed3 th\u1ecb h\u00e0m s\u1ed1. <\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>\u0110\u1ed3 th\u1ecb h\u00e0m s\u1ed1 $y = (1 - 4a)x $ \u0111i qua \u0111i\u1ec3m $A(-2; 6)$ khi: <br\/> $\\begin{aligned} & 6=(1-4a)(-2) \\\\ & \\Leftrightarrow 1 - 4a = 6 : (-2) = -3 \\\\ & \\Leftrightarrow 4a = 1 + 3 = 4 \\\\ & \\Leftrightarrow a = 1 \\\\ \\end{aligned}$ <br\/> V\u1edbi $a = 1 $ ta c\u00f3: $y = (1 - 4.1)x = -3x $ <br\/> V\u1eady c\u00f4ng th\u1ee9c c\u1ee7a h\u00e0m n\u00f3i tr\u00ean l\u00e0 $y = -3x$ <br\/> \u0110\u1ed3 th\u1ecb h\u00e0m s\u1ed1 $y = -3x$ l\u00e0 m\u1ed9t \u0111\u01b0\u1eddng th\u1eb3ng \u0111i qua $O(0; 0)$ v\u00e0 $A(1; -3)$ <\/span> <br\/> <center><img src='img\/D7B17-28.png' \/><\/center>"}]}]},"correct":"","level":"3","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:22:51"},{"id":"803","post_id":"978","mon_id":"0","chapter_id":"0","question":"Ch\u1ecdn <u>nh\u1eefng<\/u> \u0111\u00e1p \u00e1n \u0111\u00fang","options":{"time":14,"part":[{"title":"Ch\u1ecdn <u>nh\u1eefng<\/u> \u0111\u00e1p \u00e1n \u0111\u00fang","title_trans":"\u0110\u1ec1 chung cho hai c\u00e2u","temp":"checkbox","correct":[["1","2","4"]],"list":[{"point":10,"img":"","ques":"Cho h\u00e0m s\u1ed1 $y = (1 - 4a)x $ c\u00f3 \u0111\u1ed3 th\u1ecb \u0111i qua \u0111i\u1ec3m $A(-2; 6).$ <br\/> <u> C\u00e2u 2: <\/u> Nh\u1eefng \u0111i\u1ec3m n\u00e0o sau \u0111\u00e2y th\u1eb3ng h\u00e0ng? ","column":1,"number_true":3,"select":["$M(1; -3) $","$N\\left(\\dfrac{-1}{3}; 1 \\right) $","$P\\left(\\dfrac{-1}{3}; -1 \\right) $","$Q\\left(\\dfrac{1}{2}; -1,5 \\right) $"],"explain":"\u0110i\u1ec3m M(1; -3) thu\u1ed9c \u0111\u1ed3 th\u1ecb h\u00e0m s\u1ed1 $y = -3x $ v\u00ec $-3 = -3.1 $ <br\/> \u0110i\u1ec3m $N\\left(\\dfrac{-1}{3}; 1 \\right) $ thu\u1ed9c \u0111\u1ed3 th\u1ecb h\u00e0m s\u1ed1 $y = -3x $ v\u00ec $1 = -3.\\dfrac{-1}{3} $ <br\/> \u0110i\u1ec3m $P\\left(\\dfrac{-1}{3}; -1 \\right) $ kh\u00f4ng thu\u1ed9c \u0111\u1ed3 th\u1ecb h\u00e0m s\u1ed1 $y = -3x $ v\u00ec $-1 \\neq -3.\\dfrac{-1}{3} = 1 $ <br\/> \u0110i\u1ec3m $Q\\left(\\dfrac{1}{2}; -1,5 \\right) $ thu\u1ed9c \u0111\u1ed3 th\u1ecb h\u00e0m s\u1ed1 $y = -3x $ v\u00ec $-1,5 = -3.\\dfrac{1}{2} $ <br\/> V\u1eady c\u00f3 3 \u0111i\u1ec3m M, N, Q th\u1eb3ng h\u00e0ng v\u00ec n\u00f3 c\u00f9ng thu\u1ed9c \u0111\u1ed3 th\u1ecb h\u00e0m s\u1ed1 $y = -3x $ "}]}]},"correct":"","level":"3","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:22:51"}]}