{"segment":[{"time":24,"part":[{"title":"V\u1ebd \u0111\u1ed3 th\u1ecb h\u00e0m s\u1ed1.","title_trans":"","temp":"coordinates","correct":[["1,1","-4.5,-4.5","-4,-4","-3.5,-3.5","-3,-3","-2.5,-2.5","-2,-2","-1.5,-1.5","-1,-1","-0.5,-0.5","0.5,0.5","1,1","4.5,4.5","4,4","3.5,3.5","3,3","2.5,2.5","2,2","1.5,1.5"]],"list":[{"point":5,"toa_do":[["0","0",""]],"is_click":1,"name_toado_click":"A","draw_line":1,"ques":"V\u1ebd \u0111\u1ed3 th\u1ecb h\u00e0m s\u1ed1 $y = x$ <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\/> V\u1ebd \u0111\u01b0\u1eddng th\u1eb3ng qua \u0111i\u1ec3m $O(0; 0)$ v\u00e0 \u0111i\u1ec3m $A(1; a)$<\/span> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> <center><img src='https://www.luyenthi123.com/file/luyenthi123/lop7/toan/daiso/bai17/lv1/img\/D7B17-01.png' \/><\/center> <br\/> \u0110\u1ed3 th\u1ecb h\u00e0m s\u1ed1 $y = x$ l\u00e0 \u0111\u01b0\u1eddng th\u1eb3ng $OA$ v\u1edbi $O(0; 0)$ v\u00e0 $A(1; 1)$ <\/span> <br\/><br\/><br\/>"}]}],"id_ques":761},{"time":24,"part":[{"title":"V\u1ebd \u0111\u1ed3 th\u1ecb h\u00e0m s\u1ed1.","title_trans":"","temp":"coordinates","correct":[["1,-2","0.5,-1","1.5,-3","2,-4","-1,2","-0.5,1","-1.5,3","-2,4"]],"list":[{"point":5,"toa_do":[["0","0",""]],"is_click":1,"name_toado_click":"A","draw_line":1,"ques":"V\u1ebd \u0111\u1ed3 th\u1ecb h\u00e0m s\u1ed1 $y = -2x$ <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\/> V\u1ebd \u0111\u01b0\u1eddng th\u1eb3ng qua \u0111i\u1ec3m $O(0; 0)$ v\u00e0 \u0111i\u1ec3m $A(1; a)$ <\/span> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> <center><img src='https://www.luyenthi123.com/file/luyenthi123/lop7/toan/daiso/bai17/lv1/img\/D7B17-03.png' \/><\/center> <br\/> \u0110\u1ed3 th\u1ecb h\u00e0m s\u1ed1 $y = -2x$ l\u00e0 \u0111\u01b0\u1eddng th\u1eb3ng $OA$ v\u1edbi $O(0; 0)$ v\u00e0 $A(1; -2)$ <\/span> <br\/><br\/><br\/>"}]}],"id_ques":762},{"time":24,"part":[{"title":"V\u1ebd \u0111\u1ed3 th\u1ecb h\u00e0m s\u1ed1.","title_trans":"","temp":"coordinates","correct":[["1,4","0.5,2","-0.5,-2","-1,-4"]],"list":[{"point":5,"toa_do":[["0","0",""]],"is_click":1,"name_toado_click":"A","draw_line":1,"ques":"V\u1ebd \u0111\u1ed3 th\u1ecb h\u00e0m s\u1ed1 $y = 4x$ <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\/> V\u1ebd \u0111\u01b0\u1eddng th\u1eb3ng qua \u0111i\u1ec3m $O(0; 0)$ v\u00e0 \u0111i\u1ec3m $A(1; a)$<\/span> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> <center><img src='https://www.luyenthi123.com/file/luyenthi123/lop7/toan/daiso/bai17/lv1/img\/D7B17-06.png' \/><\/center> <br\/> \u0110\u1ed3 th\u1ecb h\u00e0m s\u1ed1 y = 4x l\u00e0 \u0111\u01b0\u1eddng th\u1eb3ng $OA$ v\u1edbi $O(0; 0)$ v\u00e0 $A(1; 4)$ <\/span> <br\/><br\/><br\/>"}]}],"id_ques":763},{"time":9,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[2]],"list":[{"point":5,"ques":" \u0110i\u1ec3m $M(-6; 3)$ thu\u1ed9c \u0111\u1ed3 th\u1ecb c\u1ee7a h\u00e0m s\u1ed1 n\u00e0o d\u01b0\u1edbi \u0111\u00e2y? ","select":["A. $y = \\dfrac{1}{2}x $","B. $y = \\dfrac{-1}{2}x $ ","C. $y = -3x $ ","D. $y = -2x $ "],"explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/>\u0110i\u1ec3m $M(x_{0};y_{0})$ thu\u1ed9c \u0111\u1ed3 th\u1ecb c\u1ee7a h\u00e0m s\u1ed1 $y = f(x) $ n\u1ebfu $y_{0} = f(x_{0}) $ <\/span> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> A. Thay $x = -6$ v\u00e0o $y = \\dfrac{1}{2}x $ ta \u0111\u01b0\u1ee3c $y = \\dfrac{1}{2}.(-6) = -3 \\neq 3 $ <br\/> $\\Rightarrow $ \u0111i\u1ec3m $M(-6; 3)$ kh\u00f4ng thu\u1ed9c \u0111\u1ed3 th\u1ecb h\u00e0m s\u1ed1 $y = \\dfrac{1}{2}x $ <br\/> B. Thay $x = -6$ v\u00e0o $y = \\dfrac{-1}{2}x $ ta \u0111\u01b0\u1ee3c $y = \\dfrac{-1}{2}.(-6) = 3 $ <br\/> $\\Rightarrow $ \u0111i\u1ec3m $M(-6; 3)$ thu\u1ed9c \u0111\u1ed3 th\u1ecb h\u00e0m s\u1ed1 $y = \\dfrac{-1}{2}x $ <br\/> <br\/> T\u01b0\u01a1ng t\u1ef1, ta th\u1ea5y \u0111i\u1ec3m $M(-6; 3)$ kh\u00f4ng thu\u1ed9c \u0111\u1ed3 th\u1ecb h\u00e0m s\u1ed1 $y = -3x $ v\u00e0 $y = -2x $. <br\/><br\/> <span class='basic_pink'>\u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 B. <\/span><br\/>","column":2}]}],"id_ques":764},{"time":9,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[2]],"list":[{"point":5,"ques":" Trong m\u1eb7t ph\u1eb3ng t\u1ecda \u0111\u1ed9 Oxy cho \u0111\u1ed3 th\u1ecb h\u00e0m s\u1ed1 $y = ax$ l\u00e0 \u0111\u01b0\u1eddng th\u1eb3ng $OA$ v\u1edbi \u0111i\u1ec3m $A(-3; 2).$ H\u00e3y x\u00e1c \u0111\u1ecbnh c\u00f4ng th\u1ee9c c\u1ee7a h\u00e0m s\u1ed1 tr\u00ean? ","select":["A. $y = \\dfrac{-3}{2}x $","B. $y = \\dfrac{-2}{3}x $ ","C. $y = \\dfrac{1}{2}x $ ","D. $y = \\dfrac{-1}{2}x $ "],"explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/>B\u01b0\u1edbc 1: Thay t\u1ecda \u0111\u1ed9 c\u1ee7a \u0111i\u1ec3m A: $x = x_{0}, y = y_{0}$ v\u00e0o $y = ax $ <br\/>B\u01b0\u1edbc 2: T\u1eeb \u0111\u00f3 ta x\u00e1c \u0111\u1ecbnh \u0111\u01b0\u1ee3c $ a = \\dfrac{x_{0}}{y_{0}}$. <br\/> B\u01b0\u1edbc 3: Thay a v\u00e0o $y = ax$ t\u00ecm \u0111\u01b0\u1ee3c c\u00f4ng th\u1ee9c c\u1ee7a h\u00e0m s\u1ed1 \u0111\u00e3 cho. <\/span> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> \u0110\u1ed3 th\u1ecb c\u1ee7a h\u00e0m s\u1ed1 $y = ax $ l\u00e0 \u0111\u01b0\u1eddng th\u1eb3ng OA \u0111i qua \u0111i\u1ec3m $A(-3; 2),$ do \u0111\u00f3 khi $x = -3 $ th\u00ec: <br\/> $y = a.(-3) = 2 \\Rightarrow a = \\dfrac{-2}{3} $ <br\/> C\u00f4ng th\u1ee9c c\u1ee7a h\u00e0m s\u1ed1 \u0111\u00e3 cho l\u00e0: $y = \\dfrac{-2}{3}x $ <br\/><br\/> <span class='basic_pink'>\u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 B. <\/span><br\/>","column":2}]}],"id_ques":765},{"time":9,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[3]],"list":[{"point":5,"ques":" \u0110\u1ed3 th\u1ecb c\u1ee7a h\u00e0m s\u1ed1 $y = ax$ \u0111i qua \u0111i\u1ec3m $M(5; -2).$ T\u00ednh h\u1ec7 s\u1ed1 a? ","select":["A. $\\dfrac{2}{5} $","B. $\\dfrac{-5}{2} $","C. $\\dfrac{-2}{5} $ ","D. $\\dfrac{5}{2} $"],"explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/>B\u01b0\u1edbc 1: Thay t\u1ecda \u0111\u1ed9 c\u1ee7a \u0111i\u1ec3m M: $x = x_{0}, y = y_{0}$ v\u00e0o $y = ax $ <br\/>B\u01b0\u1edbc 2: T\u1eeb \u0111\u00f3 ta x\u00e1c \u0111\u1ecbnh \u0111\u01b0\u1ee3c $ a = \\dfrac{x_{0}}{y_{0}}$. <\/span> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> Thay $x = 5; y = -2$ v\u00e0o h\u00e0m s\u1ed1 $y = ax$ ta \u0111\u01b0\u1ee3c: <br\/> $-2 = a.5 \\Rightarrow a = \\dfrac{-2}{5} $ <br\/><br\/> <span class='basic_pink'>\u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 C. <\/span><br\/>","column":4}]}],"id_ques":766},{"time":9,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":" \u0110\u1ed3 th\u1ecb c\u1ee7a h\u00e0m s\u1ed1 $y = ax $ \u0111i qua \u0111i\u1ec3m $M(-4; 6). $ T\u00ednh h\u1ec7 s\u1ed1 a? ","select":["A. $-1,5 $","B. $-0, 5 $","C. $-1 $ ","D. $1 $"],"explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/>B\u01b0\u1edbc 1: Thay t\u1ecda \u0111\u1ed9 c\u1ee7a \u0111i\u1ec3m M: $x = x_{0}, y = y_{0}$ v\u00e0o $y = ax $ <br\/>B\u01b0\u1edbc 2: T\u1eeb \u0111\u00f3 ta x\u00e1c \u0111\u1ecbnh \u0111\u01b0\u1ee3c $ a = \\dfrac{x_{0}}{y_{0}}$. <\/span> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> Thay $x = -4; y = 6$ v\u00e0o h\u00e0m s\u1ed1 $y = ax$ ta \u0111\u01b0\u1ee3c: <br\/> $6 = a.(-4) \\Rightarrow a = \\dfrac{-6}{4} = \\dfrac{-3}{2}=-1,5 $ <br\/><br\/> <span class='basic_pink'>\u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 A. <\/span><br\/>","column":4}]}],"id_ques":767},{"time":9,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[3]],"list":[{"point":5,"ques":" \u0110\u1ed3 th\u1ecb h\u00e0m s\u1ed1 $y = -5x $ kh\u00f4ng \u0111i qua \u0111i\u1ec3m: ","select":["A. $M(1; -5)$ ","B. $N(-2; 10)$ ","C. $P(-1; -5) $ ","D. $Q(2; -10)$ "],"explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> \u0110\u1ed3 th\u1ecb c\u1ee7a h\u00e0m s\u1ed1 $y = f(x) $ \u0111i qua \u0111i\u1ec3m $M(x_{0};y_{0})$ n\u1ebfu $y_{0} = f(x_{0}) $ <br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> <span class='basic_left'> A. Thay $x = 1 $ v\u00e0o $y = -5x $ ta \u0111\u01b0\u1ee3c $y = -5.1 = -5 $ <br\/> $\\Rightarrow $ \u0111\u1ed3 th\u1ecb h\u00e0m s\u1ed1 $y = -5x $ \u0111i qua \u0111i\u1ec3m $M(1; -5)$ <br\/> B.Thay $x = -2 $ v\u00e0o $y = -5x $ ta \u0111\u01b0\u1ee3c $y = -5.(-2) = 10 $ <br\/> $\\Rightarrow $ \u0111\u1ed3 th\u1ecb h\u00e0m s\u1ed1 $y = -5x $ \u0111i qua \u0111i\u1ec3m $N(-2; 10)$ <br\/> C. Thay $x = -1 $ v\u00e0o $y = -5x $ ta \u0111\u01b0\u1ee3c $y = -5.(-1) = 5 \\neq -5 $ <br\/> $\\Rightarrow $ \u0111\u1ed3 th\u1ecb h\u00e0m s\u1ed1 $y = -5x $ kh\u00f4ng \u0111i qua \u0111i\u1ec3m $P(-1; -5)$ <br\/><br\/> <span class='basic_pink'> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 C. <\/span><br\/>","column":2}]}],"id_ques":768},{"time":9,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[3]],"list":[{"point":5,"ques":" Trong nh\u1eefng \u0111i\u1ec3m sau \u0111i\u1ec3m n\u00e0o thu\u1ed9c \u0111\u1ed3 th\u1ecb h\u00e0m s\u1ed1 $y = 2x ?$","select":["A. $A(0; 1)$ ","B. $B(2; 3)$ ","C. $C(1; 2)$ ","D. $D(-1; 1)$ "],"explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/>\u0110i\u1ec3m $M(x_{0};y_{0})$ thu\u1ed9c \u0111\u1ed3 th\u1ecb c\u1ee7a h\u00e0m s\u1ed1 $y = f(x) $ n\u1ebfu $y_{0} = f(x_{0}) $ <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> <span class='basic_left'> A. Thay $x = 0 $ v\u00e0o $y = 2x $ ta \u0111\u01b0\u1ee3c $y = 2.0 = 0 \\neq 1 $ <br\/> $\\Rightarrow $ \u0111i\u1ec3m $A(0; 1)$ kh\u00f4ng thu\u1ed9c \u0111\u1ed3 th\u1ecb h\u00e0m s\u1ed1 $y = 2x .$ <br\/> B. Thay $x = 2 $ v\u00e0o $y = 2x $ ta \u0111\u01b0\u1ee3c $y = 2.2 = 4 \\neq 3 $ <br\/> $\\Rightarrow $ \u0111i\u1ec3m $B(2; 3)$ kh\u00f4ng thu\u1ed9c \u0111\u1ed3 th\u1ecb h\u00e0m s\u1ed1 $y = 2x .$ <br\/> C. Thay $x = 1 $ v\u00e0o $y = 2x $ ta \u0111\u01b0\u1ee3c $y = 2.1 = 2 $ <br\/> $\\Rightarrow $ \u0111i\u1ec3m $C(1; 2)$ thu\u1ed9c \u0111\u1ed3 th\u1ecb h\u00e0m s\u1ed1 $y = 2x $ <br\/><br\/> <span class='basic_pink'> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 C. <\/span><br\/>","column":2}]}],"id_ques":769},{"time":9,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[4]],"list":[{"point":5,"ques":" \u0110\u1ed3 th\u1ecb h\u00e0m s\u1ed1 $y = -3x $ \u0111i qua \u0111i\u1ec3m: ","select":["A. $A(1; 3)$ ","B. $B(-3; 1)$ ","C. $C(-1; -3) $ ","D. $D(-1; 3) $ "],"explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> \u0110\u1ed3 th\u1ecb c\u1ee7a h\u00e0m s\u1ed1 $y = f(x) $ \u0111i qua \u0111i\u1ec3m $M(x_{0};y_{0})$ n\u1ebfu $y_{0} = f(x_{0}) $ <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> <span class='basic_left'> A. Thay $x = 1 $ v\u00e0o $y = -3x $ ta \u0111\u01b0\u1ee3c $y = -3.1 = -3 \\neq 3 $ <br\/> $\\Rightarrow $ \u0111\u1ed3 th\u1ecb h\u00e0m s\u1ed1 $y = -3x $ kh\u00f4ng \u0111i qua \u0111i\u1ec3m $A(1; 3) $<br\/> B. Thay $x = -3 $ v\u00e0o $y = -3x $ ta \u0111\u01b0\u1ee3c $y = -3.(-3) = 9 \\neq 1 $ <br\/> $\\Rightarrow $ \u0111\u1ed3 th\u1ecb h\u00e0m s\u1ed1 $y = -3x $ kh\u00f4ng \u0111i qua \u0111i\u1ec3m $B(-3; 1)$ <br\/> C. Thay $x = -1 $ v\u00e0o $y = -3x $ ta \u0111\u01b0\u1ee3c $y = -3.(-1) = 3 \\neq -3 $ <br\/> $\\Rightarrow $ \u0111\u1ed3 th\u1ecb h\u00e0m s\u1ed1 $y = -3x $ kh\u00f4ng \u0111i qua \u0111i\u1ec3m $C(-1; -3)$ <br\/> D. Thay $x = -1 $ v\u00e0o $y = -3x $ ta \u0111\u01b0\u1ee3c $y = -3.(-1) = 3 $ <br\/>$\\Rightarrow $ \u0111\u1ed3 th\u1ecb h\u00e0m s\u1ed1 $y = -3x $ \u0111i qua \u0111i\u1ec3m $D(-1; 3)$ <br\/><br\/> <span class='basic_pink'> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 D. <\/span><br\/>","column":2}]}],"id_ques":770},{"time":9,"part":[{"title":"\u0110i\u1ec1n t\u1eeb th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["2"]]],"list":[{"point":5,"width":20,"content":"","type_input":"","ques":"\u0110\u1ed3 th\u1ecb h\u00e0m s\u1ed1 $y = 2x $ c\u00f3 h\u1ec7 s\u1ed1 a b\u1eb1ng bao nhi\u00eau? <br\/> <b> \u0110\u00e1p s\u1ed1: <\/b> $a = \\FormInput[40][bl_elm_true basic_elm basic_blank basic_blank_part]{}$","explain":" \u0110\u1ed3 th\u1ecb h\u00e0m s\u1ed1 $y = ax $ c\u00f3 h\u1ec7 s\u1ed1 b\u1eb1ng a <br\/> Suy ra \u0111\u1ed3 th\u1ecb h\u00e0m s\u1ed1 $y = 2x $ c\u00f3 h\u1ec7 s\u1ed1 b\u1eb1ng 2 <br\/> <span class='basic_pink'>V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u00e0 $2$<\/span> "}]}],"id_ques":771},{"time":9,"part":[{"title":"\u0110i\u1ec1n t\u1eeb th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["-1"]]],"list":[{"point":5,"width":20,"content":"","type_input":"","ques":"\u0110\u1ed3 th\u1ecb h\u00e0m s\u1ed1 $y = -x $ c\u00f3 h\u1ec7 s\u1ed1 a b\u1eb1ng bao nhi\u00eau? <br\/> <b> \u0110\u00e1p s\u1ed1: <\/b> $a = \\FormInput[40][bl_elm_true basic_elm basic_blank basic_blank_part]{}$","explain":" \u0110\u1ed3 th\u1ecb h\u00e0m s\u1ed1 $y = ax $ c\u00f3 h\u1ec7 s\u1ed1 b\u1eb1ng a <br\/> Suy ra \u0111\u1ed3 th\u1ecb h\u00e0m s\u1ed1 $y = - x $ c\u00f3 h\u1ec7 s\u1ed1 b\u1eb1ng $-1$ <br\/> <span class='basic_pink'>V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u00e0 $-1$<\/span>. "}]}],"id_ques":772},{"time":9,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[2]],"list":[{"point":5,"ques":" \u0110\u1ed3 th\u1ecb h\u00e0m s\u1ed1 $y = 5x $ thu\u1ed9c g\u00f3c ph\u1ea7n t\u01b0 n\u00e0o? ","select":["A. (I), (II)","B. (I), (III) ","C. (III), (IV) ","D. (II), (IV) "],"explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> \u0110\u1ed3 th\u1ecb c\u1ee7a h\u00e0m s\u1ed1 $y = ax $: <br\/> n\u1ebfu a > 0 th\u00ec \u0111\u1ed3 th\u1ecb n\u1eb1m trong g\u00f3c ph\u1ea7n t\u01b0 th\u1ee9 (I) v\u00e0 (III) <br\/> n\u1ebfu a < 0 th\u00ec \u0111\u1ed3 th\u1ecb n\u1eb1m trong g\u00f3c ph\u1ea7n t\u01b0 th\u1ee9 (II) v\u00e0 (IV) <\/span> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> \u0110\u1ed3 th\u1ecb h\u00e0m s\u1ed1 $y = 5x $ c\u00f3 5 > 0 <br\/> n\u00ean n\u00f3 n\u1eb1m trong g\u00f3c ph\u1ea7n t\u01b0 th\u1ee9 (I) v\u00e0 (III). <\/span> <br\/><br\/> <span class='basic_pink'> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 B. <\/span><br\/>","column":2}]}],"id_ques":773},{"time":9,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[3]],"list":[{"point":5,"ques":" Cho h\u00ecnh v\u1ebd, \u0111i\u1ec3m n\u00e0o thu\u1ed9c \u0111\u1ed3 th\u1ecb h\u00e0m s\u1ed1 $y = x?$ <center><img src='https://www.luyenthi123.com/file/luyenthi123/lop7/toan/daiso/bai17/lv1/img\/D7B17-07.png' \/><\/center> ","select":["A. \u0110i\u1ec3m A ","B. \u0110i\u1ec3m B ","C. \u0110i\u1ec3m C ","D. Kh\u00f4ng c\u00f3 \u0111i\u1ec3m n\u00e0o "],"hint":"V\u1ebd \u0111\u1ed3 th\u1ecb h\u00e0m s\u1ed1 y = x r\u1ed3i x\u00e1c \u0111\u1ecbnh. ","explain":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop7/toan/daiso/bai17/lv1/img\/D7B17-08.png' \/><\/center> <br\/> \u0110\u1ed3 th\u1ecb h\u00e0m s\u1ed1 y = x l\u00e0 \u0111\u01b0\u1eddng th\u1eb3ng \u0111i qua g\u1ed1c t\u1ecda \u0111\u1ed9 $O(0; 0)$ v\u00e0 \u0111i\u1ec3m c\u00f3 t\u1ecda \u0111\u1ed9 l\u00e0 $(-1; -1).$ <br\/> Ta th\u1ea5y \u0111\u1ed3 th\u1ecb h\u00e0m s\u1ed1 \u0111i qua $C(-1; -1).$ <br\/><br\/> <span class='basic_pink'>\u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 C. <\/span> <\/span> ","column":2}]}],"id_ques":774},{"time":9,"part":[{"title":"\u0110i\u1ec1n t\u1eeb th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["-1"]]],"list":[{"point":5,"width":20,"content":"","type_input":"","ques":"Cho \u0111\u1ed3 th\u1ecb h\u00e0m s\u1ed1 $y = \\dfrac{2}{3} x$ v\u00e0 \u0111i\u1ec3m B thu\u1ed9c \u0111\u1ed3 th\u1ecb \u0111\u00f3. T\u00ecm t\u1ecda \u0111\u1ed9 \u0111i\u1ec3m B n\u1ebfu bi\u1ebft ho\u00e0nh \u0111\u1ed9 \u0111i\u1ec3m B l\u00e0 $\\dfrac{-3}{2} ?$. <br\/> <b> \u0110\u00e1p s\u1ed1: <\/b> $B\\left(\\dfrac{-3}{2}; \\FormInput[40][bl_elm_true basic_elm basic_blank basic_blank_part]{}\\right)$","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/>\u0110i\u1ec3m $B(x_{0};y_{0})$ thu\u1ed9c \u0111\u1ed3 th\u1ecb c\u1ee7a h\u00e0m s\u1ed1 $y = f(x) $ n\u1ebfu $y_{0} = f(x_{0}) $ <\/span> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> Thay $x = \\dfrac{-3}{2}$ v\u00e0o $y = \\dfrac{2}{3}x$ ta \u0111\u01b0\u1ee3c $y = \\dfrac{2}{3}.\\dfrac{-3}{2} = -1 $ <br\/> Suy ra t\u1ecda \u0111\u1ed9 \u0111i\u1ec3m B l\u00e0 $B\\left(\\dfrac{-3}{2}; -1\\right)$ <br\/> <span class='basic_pink'>V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u00e0 $-1$ <\/span> "}]}],"id_ques":775},{"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":[[["3"],["2"]]],"list":[{"point":5,"width":50,"type_input":"","input_hint":["frac"],"ques":"Cho \u0111\u1ed3 th\u1ecb h\u00e0m s\u1ed1 $y = \\dfrac{2}{3}x - 1$ v\u00e0 \u0111i\u1ec3m D thu\u1ed9c \u0111\u1ed3 th\u1ecb \u0111\u00f3. T\u00ecm t\u1ecda \u0111\u1ed9 \u0111i\u1ec3m D n\u1ebfu bi\u1ebft tung \u0111\u1ed9 \u0111i\u1ec3m D l\u00e0 0? <br\/> <b> \u0110\u00e1p s\u1ed1: <\/b> D(<div class=\"frac123\"><div class=\"ts\">_input_<\/div><div class=\"ms\">_input_<\/div><\/div>; 0) ","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/>\u0110i\u1ec3m $D(x_{0};y_{0})$ thu\u1ed9c \u0111\u1ed3 th\u1ecb c\u1ee7a h\u00e0m s\u1ed1 $y = f(x) $ n\u1ebfu $y_{0} = f(x_{0}) $ <\/span> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> Thay y = 0 v\u00e0o $y = \\dfrac{2}{3}x - 1$ ta \u0111\u01b0\u1ee3c $0 = \\dfrac{2}{3}x - 1 \\Leftrightarrow \\dfrac{2}{3}x = 1 \\Leftrightarrow x = \\dfrac{3}{2} $ <br\/> Suy ra t\u1ecda \u0111\u1ed9 \u0111i\u1ec3m D l\u00e0 $D\\left(\\dfrac{3}{2}; 0\\right)$"}]}],"id_ques":776},{"time":9,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[3]],"list":[{"point":5,"ques":" <span class='basic_left'> X\u00e9t c\u00e1c kh\u1eb3ng \u0111\u1ecbnh sau: <br\/>(I). \u0110\u1ed3 th\u1ecb c\u1ee7a h\u00e0m s\u1ed1 $y = ax (a \\neq 0) $ l\u00e0 m\u1ed9t \u0111\u01b0\u1eddng th\u1eb3ng song song v\u1edbi tr\u1ee5c ho\u00e0nh. <br\/> (II). \u0110\u1ed3 th\u1ecb c\u1ee7a h\u00e0m s\u1ed1 $y = ax (a \\neq 0) $ l\u00e0 m\u1ed9t \u0111\u01b0\u1eddng th\u1eb3ng song song v\u1edbi tr\u1ee5c tung. <br\/> Kh\u1eb3ng \u0111\u1ecbnh n\u00e0o l\u00e0 \u0111\u00fang? <\/span> ","select":["A. Ch\u1ec9 c\u00f3 (I) \u0111\u00fang ","B. Ch\u1ec9 c\u00f3 (II) \u0111\u00fang ","C. C\u1ea3 (I) v\u00e0 (II) \u0111\u1ec1u sai ","D. C\u1ea3 (I) v\u00e0 (II) \u0111\u1ec1u \u0111\u00fang"],"explain":" \u0110\u1ed3 th\u1ecb c\u1ee7a h\u00e0m s\u1ed1 $y = ax (a \\neq 0) $ l\u00e0 m\u1ed9t \u0111\u01b0\u1eddng th\u1eb3ng \u0111i qua g\u1ed1c t\u1ecda \u0111\u1ed9. <br\/> N\u00ean c\u1ea3 hai kh\u1eb3ng \u0111\u1ecbnh tr\u00ean \u0111\u1ec1u sai. <br\/><br\/> <span class='basic_pink'> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 C. <\/span> ","column":2}]}],"id_ques":777},{"time":9,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":" H\u00e0m s\u1ed1 $y = \\dfrac{-2}{3}x $ nh\u1eadn gi\u00e1 tr\u1ecb d\u01b0\u01a1ng th\u00ec: ","select":["A. x < 0 ","B. x > 0 ","C. x = 0 ","D. Kh\u00f4ng x\u00e1c \u0111\u1ecbnh "],"explain":" H\u00e0m s\u1ed1 $y = \\dfrac{-2}{3}x $ nh\u1eadn gi\u00e1 tr\u1ecb d\u01b0\u01a1ng th\u00ec: x < 0. <br\/><br\/> <span class='basic_pink'> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 A. <\/span> ","column":2}]}],"id_ques":778},{"time":9,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[4]],"list":[{"point":5,"ques":" \u0110i\u1ec3m thu\u1ed9c \u0111\u1ed3 th\u1ecb h\u00e0m s\u1ed1 $y = -2x $ l\u00e0: ","select":["A. $M(-1; -2)$ ","B. $N\\left(\\dfrac{1}{2}; -4\\right)$ ","C. $P(0; -2)$ ","D. $Q(-1; 2)$ "],"explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/>\u0110i\u1ec3m $M(x_{0};y_{0})$ thu\u1ed9c \u0111\u1ed3 th\u1ecb c\u1ee7a h\u00e0m s\u1ed1 $y = f(x) $ n\u1ebfu $y_{0} = f(x_{0}) $ <\/span> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> <span class='basic_left'> A. Thay $x = -1 $ v\u00e0o $y = -2x $ ta \u0111\u01b0\u1ee3c $y = -2.(-1) = 2 \\neq -2 $ <br\/> $\\Rightarrow $ \u0111i\u1ec3m $M(-1; -2)$ kh\u00f4ng thu\u1ed9c \u0111\u1ed3 th\u1ecb h\u00e0m s\u1ed1 $y = -2x .$ <br\/> B. Thay $x = \\dfrac{1}{2} $ v\u00e0o $y = -2x $ ta \u0111\u01b0\u1ee3c $y = -2.\\dfrac{1}{2} = -1 \\neq -4 $ <br\/> $\\Rightarrow $ \u0111i\u1ec3m $N\\left(\\dfrac{1}{2}; -4\\right)$ kh\u00f4ng thu\u1ed9c \u0111\u1ed3 th\u1ecb h\u00e0m s\u1ed1 $y = -2x .$ <br\/> C. Thay $x = 0 $ v\u00e0o $y = -2x $ ta \u0111\u01b0\u1ee3c $y = -2.0 = 0 \\neq -2 $ <br\/> $\\Rightarrow $ \u0111i\u1ec3m $P(0; -2)$ kh\u00f4ng thu\u1ed9c \u0111\u1ed3 th\u1ecb h\u00e0m s\u1ed1 $y = -2x .$ <br\/> D. Thay $x = -1 $ v\u00e0o $y = -2x $ ta \u0111\u01b0\u1ee3c $y = -2.(-1) = 2 $ <br\/> $\\Rightarrow $ \u0111i\u1ec3m $Q(-1; 2)$ thu\u1ed9c \u0111\u1ed3 th\u1ecb h\u00e0m s\u1ed1 $y = -2x .$ <\/span> <br\/><br\/> <span class='basic_pink'> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 D. <\/span><br\/>","column":2}]}],"id_ques":779},{"time":9,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":" \u0110\u1ed3 th\u1ecb h\u00e0m s\u1ed1 $y = \\dfrac{3}{4} x $ l\u00e0 \u0111\u01b0\u1eddng th\u1eb3ng \u0111i qua \u0111i\u1ec3m: ","select":["A. $M(-4; -3)$ ","B. $N(2; 6)$ ","C. $C\\left(1;\\dfrac{7}{4}\\right)$ ","D. $D\\left(-1;\\dfrac{-1}{4}\\right)$ "],"explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> \u0110\u1ed3 th\u1ecb c\u1ee7a h\u00e0m s\u1ed1 $y = f(x) $ \u0111i qua \u0111i\u1ec3m $M(x_{0};y_{0})$ n\u1ebfu $y_{0} = f(x_{0}) $ <\/span> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> <span class='basic_left'> A. Thay $x = -4 $ v\u00e0o $y = \\dfrac{3}{4} x $ ta \u0111\u01b0\u1ee3c $y = \\dfrac{3}{4}.(-4) = -3 $ <br\/> $\\Rightarrow $ \u0111\u1ed3 th\u1ecb h\u00e0m s\u1ed1 $y = \\dfrac{3}{4}x $ \u0111i qua \u0111i\u1ec3m $M(-4; -3)$ <br\/> T\u01b0\u01a1ng t\u1ef1, ta th\u1ea5y \u0111\u1ed3 th\u1ecb h\u00e0m s\u1ed1 kh\u00f4ng \u0111i qua c\u00e1c \u0111i\u1ec3m N, C, D. <\/span> <br\/><br\/> <span class='basic_pink'> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 A. <\/span><br\/>","column":2}]}],"id_ques":780}],"lesson":{"save":0,"level":1}}