{"segment":[{"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":[[["1"],["0"],["-2"]]],"list":[{"point":5,"width":50,"type_input":"","ques":" Cho h\u00e0m s\u1ed1 $y = 2x $ <br\/> \u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o \u00f4 tr\u1ed1ng trong b\u1ea3ng sau: <table><tr><td>$x$<\/td><td>0<\/td><td>$-1$<\/td><td>_input_<\/td><\/tr><tr><td>$y$<\/td><td>_input_<\/td><td>_input_<\/td><td>2<\/td><\/tr><\/table>","explain":" Ta c\u00f3: $y = 2x $ <br\/> V\u1edbi $x = 0$ th\u00ec $ y = 2.0 =0 $ <br\/> V\u1edbi $x = -1$ th\u00ec $ y = 2.(-1) = -2 $ <br\/> V\u1edbi $y = 2$ th\u00ec $ x = 2 : 2 = 1 $ <br\/><br\/><span class='basic_pink'> \u0110\u00e1p \u00e1n c\u1ea7n \u0111i\u1ec1n theo th\u1ee9 t\u1ef1 t\u1eeb tr\u00e1i sang ph\u1ea3i l\u1ea7n l\u01b0\u1ee3t l\u00e0 $0, -2; 1$ <\/span><\/span> "}]}],"id_ques":661},{"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\u00e0m s\u1ed1 $y = f(x) = 4x + b $ <br\/> Bi\u1ebft $f(1) = 5$, t\u00ednh b? ","select":["A. $b = -1 $","B. $b = 9 $","C. $b = 1 $","D. $b = 2 $"],"hint":" T\u00ednh $f(1)$ sau \u0111\u00f3 t\u00ecm b.","explain":" Ta c\u00f3: $y = f(x) = 4x + b $ <br\/> Do \u0111\u00f3: $ f(1) = 4.1 + b = 4 + b$ <br\/> M\u00e0 $f(1) = 5 \\Rightarrow 4 + b = 5 \\Rightarrow b = 1 $ <br\/><br\/><span class='basic_pink'> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 C. <\/span><\/span> ","column":2}]}],"id_ques":662},{"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":[[["6"]]],"list":[{"point":5,"width":50,"type_input":"","ques":" Cho h\u00e0m s\u1ed1 $y = f(x) $ c\u00f3 c\u00e1c gi\u00e1 tr\u1ecb t\u01b0\u01a1ng \u1ee9ng cho b\u1edfi b\u1ea3ng sau: <table><tr><td>$x$<\/td><td>$-2$<\/td><td>$-1$<\/td><td>0<\/td><td>1<\/td><td>2<\/td><\/tr><tr><td>$f(x)$<\/td><td>6<\/td><td>4<\/td><td>2<\/td><td>0<\/td><td>0<\/td><\/tr><\/table> T\u00ednh $f(-2) = \\FormInput[40][bl_elm_true basic_elm basic_blank basic_blank_part]{}$ ","explain":" D\u1ef1a v\u00e0o b\u1ea3ng, ta c\u00f3: $f(-2) = 6 $ <br\/><span class='basic_pink'> V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u00e0 6 <\/span><\/span> "}]}],"id_ques":663},{"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":" Cho h\u00e0m s\u1ed1 $y = f(x) = 2x + 5 . $ T\u00ecm $x$ \u0111\u1ec3 $f(x) = 3$ ","select":["A. $x = -1 $","B. $x = 11 $","C. $x = 4 $","D. $x = 6 $"],"hint":"C\u00f3 $ f(x) = 2x + 5 = 3$ ","explain":" Ta c\u00f3: $ f(x) = 3 \\\\ \\Rightarrow 2x + 5 = 3 \\\\ 2x = 3 - 5 \\\\ x = -2 \\\\ x = -2 : 2 \\\\ x = -1 $ <br\/><br\/><span class='basic_pink'> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 A. <\/span><\/span> ","column":2}]}],"id_ques":664},{"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"]]],"list":[{"point":5,"width":50,"type_input":"","ques":" Cho h\u00e0m s\u1ed1 $y = f(x) = |x - 2| $ <br\/> T\u00ednh $f(-2) = \\FormInput[40][bl_elm_true basic_elm basic_blank basic_blank_part]{}$ ","hint":"Thay $x = -2$ v\u00e0o c\u00f4ng th\u1ee9c \u0111\u1ec3 t\u00ednh $f(-2)$. ","explain":" Ta c\u00f3: $y = f(x) = |x - 2| $ <br\/> Do \u0111\u00f3: $ f(-2) = |-2 - 2| = |-4| = 4 $ <br\/><br\/><span class='basic_pink'> V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u00e0 4. <\/span><\/span> "}]}],"id_ques":665},{"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":[[["-9"],["-6"],["-5"]]],"list":[{"point":5,"width":50,"type_input":"","ques":" Cho h\u00e0m s\u1ed1 $y = f(x) = x - 5 $ <br\/> \u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o \u00f4 tr\u1ed1ng trong b\u1ea3ng sau: <table><tr><td>$x$<\/td><td>$-4$<\/td><td>$-1$ <\/td><td>0<\/td><\/tr><tr><td>$y$<\/td><td>_input_<\/td><td>_input_<\/td><td>_input_<\/td><\/tr><\/table>","hint":"Thay $x $ v\u00e0o c\u00f4ng th\u1ee9c \u0111\u1ec3 t\u00ecm $y$. ","explain":" Ta c\u00f3: $y = f(x) = x - 5 $ <br\/> V\u1edbi $x = -4$ th\u00ec $ f(-4) = -4 - 5 = -9 $ <br\/> V\u1edbi $x = -1$ th\u00ec $ f(-1) = -1 - 5 = -6 $ <br\/> V\u1edbi $x = 0$ th\u00ec $ f(0) = 0 - 5 = -5 $<br\/><span class='basic_pink'> \u0110\u00e1p \u00e1n c\u1ea7n \u0111i\u1ec1n theo th\u1ee9 t\u1ef1 t\u1eeb tr\u00e1i qua ph\u1ea3i l\u00e0 $-9, -6 -5$ <\/span><\/span> "}]}],"id_ques":666},{"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":"C\u00e1c gi\u00e1 tr\u1ecb t\u01b0\u01a1ng \u1ee9ng c\u1ee7a hai \u0111\u1ea1i l\u01b0\u1ee3ng $x$ v\u00e0 $y$ \u0111\u01b0\u1ee3c cho trong hai b\u1ea3ng sau: <br\/> B\u1ea3ng 1 <table><tr><td>$x$<\/td><td>$-5$<\/td><td>0<\/td><td>3<\/td><td>4<\/td><\/tr><tr><td>$y$<\/td><td>7<\/td><td>2<\/td><td>1<\/td><td>||<\/td><\/tr><\/table> B\u1ea3ng 2 <table><tr><td>$x$<\/td><td>-3<\/td><td>$2$<\/td><td>2<\/td><td>6<\/td><\/tr><tr><td>$y$<\/td><td>$-6$<\/td><td>$-10$<\/td><td>5<\/td><td>3<\/td><\/tr><\/table> B\u1ea3ng n\u00e0o m\u00e0 \u0111\u1ea1i l\u01b0\u1ee3ng $y$ l\u00e0 h\u00e0m s\u1ed1 c\u1ee7a \u0111\u1ea1i l\u01b0\u1ee3ng $x$? ","select":["A. B\u1ea3ng 1","B. B\u1ea3ng 2","C. B\u1ea3ng 1 v\u00e0 2","D. Kh\u00f4ng c\u00f3 b\u1ea3ng n\u00e0o"],"hint":"Xem \u0111\u1ecbnh ngh\u0129a h\u00e0m s\u1ed1. ","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> <b> C\u1ea7n ki\u1ec3m tra \u0111i\u1ec1u ki\u1ec7n: <\/b> <br\/> M\u1ed7i gi\u00e1 tr\u1ecb c\u1ee7a \u0111\u1ea1i l\u01b0\u1ee3ng $x$ \u0111\u01b0\u1ee3c t\u01b0\u01a1ng \u1ee9ng v\u1edbi m\u1ed9t v\u00e0 ch\u1ec9 m\u1ed9t gi\u00e1 tr\u1ecb c\u1ee7a \u0111\u1ea1i l\u01b0\u1ee3ng $y$ hay kh\u00f4ng? <\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> <span class='basic_left'> * X\u00e9t b\u1ea3ng 1, ta th\u1ea5y gi\u00e1 tr\u1ecb $x = 4 $ c\u1ee7a \u0111\u1ea1i l\u01b0\u1ee3ng $x$ kh\u00f4ng \u0111\u01b0\u1ee3c t\u01b0\u01a1ng \u1ee9ng v\u1edbi m\u1ed9t gi\u00e1 tr\u1ecb n\u00e0o c\u1ee7a \u0111\u1ea1i l\u01b0\u1ee3ng $y$ n\u00ean \u0111\u1ea1i l\u01b0\u1ee3ng $y$ kh\u00f4ng ph\u1ea3i l\u00e0 h\u00e0m s\u1ed1 c\u1ee7a \u0111\u1ea1i l\u01b0\u1ee3ng $x$. <br\/> * X\u00e9t b\u1ea3ng 2, ta th\u1ea5y gi\u00e1 tr\u1ecb $x = 2$ c\u1ee7a \u0111\u1ea1i l\u01b0\u1ee3ng $x$ \u0111\u01b0\u1ee3c t\u01b0\u01a1ng \u1ee9ng v\u1edbi hai gi\u00e1 tr\u1ecb kh\u00e1c nhau c\u1ee7a \u0111\u1ea1i l\u01b0\u1ee3ng $y$ l\u00e0 $-10$ v\u00e0 5 n\u00ean \u0111\u1ea1i l\u01b0\u1ee3ng $y$ kh\u00f4ng ph\u1ea3i l\u00e0 h\u00e0m s\u1ed1 c\u1ee7a \u0111\u1ea1i l\u01b0\u1ee3ng $x$. <\/span> <br\/><br\/><span class='basic_pink'> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 D. <\/span><\/span> ","column":2}]}],"id_ques":667},{"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":" Cho h\u00e0m s\u1ed1 $y = f(x) = -5x^{2}$ th\u00ec $f(-1)$ b\u1eb1ng: ","select":["A. $-22$ ","B. $-5$ ","C. $28$ ","D. $5$ "],"hint":"Thay $x = -1 $ v\u00e0o c\u00f4ng th\u1ee9c \u0111\u1ec3 t\u00ecm f(-1). ","explain":" Ta c\u00f3: $y = f(x) = -5x^{2} $ <br\/> Do \u0111\u00f3: $ f(-1) = -5(-1)^{2} = -5 $ <br\/><br\/><span class='basic_pink'> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 B. <\/span><\/span> ","column":4}]}],"id_ques":668},{"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\u00e0m s\u1ed1 $y = f(x) = 3x + 2$ th\u00ec $f(-2)$ b\u1eb1ng: ","select":["A. $-22$ ","B. $8$ ","C. $-4$ ","D. $4 $"],"hint":"Thay $x = -2 $ v\u00e0o c\u00f4ng th\u1ee9c \u0111\u1ec3 t\u00ecm f(-2). ","explain":" Ta c\u00f3: $y = f(x) = 3x + 2 $ <br\/> Do \u0111\u00f3: $ f(-2) = 3.(-2) + 2 = -6 + 2 = -4 $ <br\/><br\/><span class='basic_pink'> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 C. <\/span><\/span> ","column":4}]}],"id_ques":669},{"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":" Cho h\u00e0m s\u1ed1 $y = f(x) = \\dfrac{-10}{x} .$ C\u1ed9t n\u00e0o sau \u0111\u00e2y sai? <table><tr><th>C\u1ed9t<\/th><th>1<\/th><th>2<\/th><th>3<\/th><\/tr><tr><td>$x$<\/td><td>$-5$<\/td><td>1<\/td><td>2<\/td><\/tr><tr><td>$y = f(x)$<\/td><td>2<\/td><td>10<\/td><td>$-5$<\/td><\/tr><\/table> ","select":["A. C\u1ed9t 1 ","B. C\u1ed9t 2 ","C. C\u1ed9t 3","D. C\u1ed9t 2 v\u00e0 3"],"hint":"Thay $x$ v\u00e0o c\u00f4ng th\u1ee9c \u0111\u1ec3 t\u00ecm $y$. ","explain":" Ta c\u00f3: $y = f(x) = \\dfrac{-10}{x}$ <br\/> V\u1edbi $x = -5$ th\u00ec $ f(-5) = \\dfrac{-10}{-5} = 2 $ <br\/> V\u1edbi $x = 1$ th\u00ec $ f(1) = \\dfrac{-10}{1} = -10 $ <br\/> V\u1edbi $x = 2$ th\u00ec $ f(2) = \\dfrac{-10}{2} = -5 $ <br\/> V\u1eady c\u1ed9t sai l\u00e0 c\u1ed9t 2. <br\/><br\/><span class='basic_pink'> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 B. <\/span><\/span> ","column":2}]}],"id_ques":670},{"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"],["-1"],["-5"]]],"list":[{"point":5,"width":50,"type_input":"","ques":" Cho h\u00e0m s\u1ed1 $y = f(x) = 2x - 3 $ <br\/> \u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o \u00f4 tr\u1ed1ng trong b\u1ea3ng sau: <table><tr><td>$x$<\/td><td>0<\/td><td>1<\/td><td>-1<\/td><\/tr><tr><td>$y = f(x)$<\/td><td>_input_<\/td><td>_input_<\/td><td>_input_<\/td><\/tr><\/table>","hint":"Thay c\u00e1c gi\u00e1 tr\u1ecb c\u1ee7a $x$ v\u00e0o h\u00e0m s\u1ed1 \u0111\u1ec3 t\u00ecm $y$. ","explain":" Ta c\u00f3: $y = f(x) = 2x - 3 $ <br\/> V\u1edbi $x = 0$ th\u00ec $ f(0) = 2.0 - 3 = 0 - 3 = -3$ <br\/> V\u1edbi $x = 1$ th\u00ec $ f(1) = 2.1 - 3 = 2 - 3 = -1$ <br\/> V\u1edbi $x = -1$ th\u00ec $ f(-1) = 2.(-1) - 3 = -2 - 3 = -5$ <br\/><br\/><span class='basic_pink'> \u0110\u00e1p \u00e1n c\u1ea7n \u0111i\u1ec1n l\u1ea7n l\u01b0\u1ee3t l\u00e0 $-3; -1; -5$ <\/span><\/span> "}]}],"id_ques":671},{"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":[[["1"],["8"],["27"]]],"list":[{"point":5,"width":50,"type_input":"","ques":" Cho h\u00e0m s\u1ed1 $y = f(x) = x^{3} $ <br\/> \u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o \u00f4 tr\u1ed1ng trong b\u1ea3ng sau: <table><tr><td>$x$<\/td><td>1<\/td><td>2<\/td><td>3<\/td><\/tr><tr><td>$y = f(x)$<\/td><td>_input_<\/td><td>_input_<\/td><td>_input_<\/td><\/tr><\/table>","hint":"Thay c\u00e1c gi\u00e1 tr\u1ecb c\u1ee7a $x$ v\u00e0o h\u00e0m s\u1ed1 \u0111\u1ec3 t\u00ecm $y$. ","explain":" Ta c\u00f3: $y = f(x) = x^{3} $<br\/> V\u1edbi $x = 1$ th\u00ec $ f(1) = 1^{3} = 1$ <br\/> V\u1edbi $x = 2$ th\u00ec $ f(2) = 2^{3} = 8$ <br\/> V\u1edbi $x = 3$ th\u00ec $ f(3) = 3^{3} = 27$ <br\/><br\/><span class='basic_pink'> \u0110\u00e1p \u00e1n c\u1ea7n \u0111i\u1ec1n l\u1ea7n l\u01b0\u1ee3t l\u00e0 1; 8; 27 <\/span><\/span> "}]}],"id_ques":672},{"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":" Cho h\u00e0m s\u1ed1 $y = f(x) = 3x + 1.$ Ta c\u00f3: ","select":["A. $f(1) = 3$ ","B. $f(1) = 4$ ","C. $f(2) = 6$ ","D. $f(2) = 4$ "],"hint":"Thay $x$ v\u00e0o c\u00f4ng th\u1ee9c \u0111\u1ec3 t\u00ecm $f(x)$. ","explain":" Ta c\u00f3: $y = f(x) = 3x + 1 $ <br\/> Do \u0111\u00f3: $ f(1) = 3.1 + 1 = 3 + 1 = 4 \\\\ f(2) = 3.2 + 1 = 6 + 1 = 7$ <br\/><br\/><span class='basic_pink'> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 B. <\/span><\/span> ","column":2}]}],"id_ques":673},{"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":" Cho h\u00e0m s\u1ed1 $y = f(x) = 2x + 3.$ Ta c\u00f3: ","select":["A. $f(0) = 0$ ","B. $f(0) = 3$ ","C. $f(1) = 3$ ","D. $f(1) = 2$ "],"hint":"Thay $x$ v\u00e0o c\u00f4ng th\u1ee9c \u0111\u1ec3 t\u00ecm $f(x)$. ","explain":" Ta c\u00f3: $y = f(x) = 2x + 3 $ <br\/> Do \u0111\u00f3: $ f(0) = 2.0 + 3 = 0 + 3 = 3 \\\\ f(1) = 2.1 + 3 = 2 + 3 = 5$ <br\/><br\/><span class='basic_pink'> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 B. <\/span><\/span> ","column":2}]}],"id_ques":674},{"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":[[["-2"]]],"list":[{"point":5,"width":50,"type_input":"","ques":" Cho h\u00e0m s\u1ed1 $y = f(x) = 3x - 5 $ <br\/> T\u00ednh f(1) = $\\FormInput[40][bl_elm_true basic_elm basic_blank basic_blank_part]{}$ ","hint":"Thay $x = 1$ v\u00e0o c\u00f4ng th\u1ee9c \u0111\u1ec3 t\u00ecm $f(1)$. ","explain":" Ta c\u00f3: $y = f(x) = 3x - 5 $ <br\/> Do \u0111\u00f3: $ f(1) = 3.1 - 5 = 3 - 5 = -2 $ <br\/><br\/><span class='basic_pink'> V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u00e0 $-2$ <\/span><\/span> "}]}],"id_ques":675},{"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"]]],"list":[{"point":5,"width":50,"type_input":"","ques":" Cho h\u00e0m s\u1ed1 $y = f(x) = 2x^{2} + 3$ <br\/> T\u00ednh f(0) = $\\FormInput[40][bl_elm_true basic_elm basic_blank basic_blank_part]{}$ ","hint":"Thay $x = 0$ v\u00e0o c\u00f4ng th\u1ee9c \u0111\u1ec3 t\u00ecm $f(0)$. ","explain":" Ta c\u00f3: $y = f(x) = 2x^{2} + 3 $ <br\/> Do \u0111\u00f3: $ f(0) = 2.0^{2} + 3 = 0 + 3 = 3$ <br\/><br\/><span class='basic_pink'> V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u00e0 3. <\/span><\/span> "}]}],"id_ques":676},{"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":"C\u00e1c gi\u00e1 tr\u1ecb t\u01b0\u01a1ng \u1ee9ng c\u1ee7a hai \u0111\u1ea1i l\u01b0\u1ee3ng $x$ v\u00e0 $y$ \u0111\u01b0\u1ee3c cho trong hai b\u1ea3ng sau: <br\/> B\u1ea3ng 1<table><tr><td>$x$<\/td><td>0<\/td><td>1<\/td><td>1<\/td><td>1<\/td><\/tr><tr><td>$y$<\/td><td>0<\/td><td>1<\/td><td>2<\/td><td>3<\/td><\/tr><\/table> B\u1ea3ng 2 <table><tr><td>$x$<\/td><td>5<\/td><td>6<\/td><td>7<\/td><td>8<\/td><\/tr><tr><td>$y$<\/td><td>9<\/td><td>9<\/td><td>9<\/td><td>9<\/td><\/tr><\/table>B\u1ea3ng n\u00e0o m\u00e0 \u0111\u1ea1i l\u01b0\u1ee3ng $y$ l\u00e0 h\u00e0m s\u1ed1 c\u1ee7a \u0111\u1ea1i l\u01b0\u1ee3ng $x$? ","select":["A. B\u1ea3ng 1","B. B\u1ea3ng 2","C. B\u1ea3ng 1 v\u00e0 2","D. Kh\u00f4ng c\u00f3 b\u1ea3ng n\u00e0o"],"explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> <b> C\u1ea7n ki\u1ec3m tra \u0111i\u1ec1u ki\u1ec7n: <\/b> <br\/> M\u1ed7i gi\u00e1 tr\u1ecb c\u1ee7a \u0111\u1ea1i l\u01b0\u1ee3ng $x$ \u0111\u01b0\u1ee3c t\u01b0\u01a1ng \u1ee9ng v\u1edbi m\u1ed9t v\u00e0 ch\u1ec9 m\u1ed9t gi\u00e1 tr\u1ecb c\u1ee7a \u0111\u1ea1i l\u01b0\u1ee3ng $y$ hay kh\u00f4ng? <\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> <span class='basic_left'> * X\u00e9t b\u1ea3ng 1, ta th\u1ea5y gi\u00e1 tr\u1ecb $x = 1$ c\u1ee7a \u0111\u1ea1i l\u01b0\u1ee3ng $x$ \u0111\u01b0\u1ee3c t\u01b0\u01a1ng \u1ee9ng v\u1edbi ba gi\u00e1 tr\u1ecb kh\u00e1c nhau c\u1ee7a \u0111\u1ea1i l\u01b0\u1ee3ng $y$ l\u00e0 1, 2 v\u00e0 3 n\u00ean \u0111\u1ea1i l\u01b0\u1ee3ng $y$ kh\u00f4ng ph\u1ea3i l\u00e0 h\u00e0m s\u1ed1 c\u1ee7a \u0111\u1ea1i l\u01b0\u1ee3ng $x$. <br\/> * X\u00e9t b\u1ea3ng 2, ta th\u1ea5y m\u1ed7i gi\u00e1 tr\u1ecb c\u1ee7a $x$ \u0111\u01b0\u1ee3c t\u01b0\u01a1ng \u1ee9ng v\u1edbi m\u1ed9t v\u00e0 ch\u1ec9 m\u1ed9t gi\u00e1 tr\u1ecb c\u1ee7a $y,$ n\u00ean $y$ l\u00e0 h\u00e0m s\u1ed1 c\u1ee7a $x$ <br\/> (\u1edf \u0111\u00e2y, $y$ \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 h\u00e0m h\u1eb1ng). <\/span> <br\/><br\/><span class='basic_pink'> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 B. <\/span><\/span> ","column":2}]}],"id_ques":677},{"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":"C\u00e1c gi\u00e1 tr\u1ecb t\u01b0\u01a1ng \u1ee9ng c\u1ee7a hai \u0111\u1ea1i l\u01b0\u1ee3ng $x$ v\u00e0 $y$ \u0111\u01b0\u1ee3c cho trong hai b\u1ea3ng sau: <br\/> B\u1ea3ng 1<table><tr><td>$x$<\/td><td>$-2$<\/td><td>$-1$<\/td><td>$-2$<\/td><td>3<\/td><\/tr><tr><td>$y$<\/td><td>4<\/td><td>1<\/td><td>$-4$<\/td><td>9<\/td><\/tr><\/table> B\u1ea3ng 2 <table><tr><td>$x$<\/td><td>$-4$<\/td><td>$-3$<\/td><td>1<\/td><td>2<\/td><\/tr><tr><td>$y$<\/td><td>16<\/td><td>9<\/td><td>1<\/td><td>4<\/td><\/tr><\/table> B\u1ea3ng n\u00e0o m\u00e0 \u0111\u1ea1i l\u01b0\u1ee3ng $y$ l\u00e0 h\u00e0m s\u1ed1 c\u1ee7a \u0111\u1ea1i l\u01b0\u1ee3ng $x$? ","select":["A. B\u1ea3ng 1","B. B\u1ea3ng 2","C. B\u1ea3ng 1 v\u00e0 2","D. Kh\u00f4ng c\u00f3 b\u1ea3ng n\u00e0o"],"hint":"Xem \u0111\u1ecbnh ngh\u0129a h\u00e0m s\u1ed1. ","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> <b> C\u1ea7n ki\u1ec3m tra \u0111i\u1ec1u ki\u1ec7n: <\/b> <br\/> M\u1ed7i gi\u00e1 tr\u1ecb c\u1ee7a \u0111\u1ea1i l\u01b0\u1ee3ng $x$ \u0111\u01b0\u1ee3c t\u01b0\u01a1ng \u1ee9ng v\u1edbi m\u1ed9t v\u00e0 ch\u1ec9 m\u1ed9t gi\u00e1 tr\u1ecb c\u1ee7a \u0111\u1ea1i l\u01b0\u1ee3ng $y$ hay kh\u00f4ng? <\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> <span class='basic_left'> * X\u00e9t b\u1ea3ng 1, ta th\u1ea5y gi\u00e1 tr\u1ecb $x = -2$ c\u1ee7a \u0111\u1ea1i l\u01b0\u1ee3ng $x$ \u0111\u01b0\u1ee3c t\u01b0\u01a1ng \u1ee9ng v\u1edbi hai gi\u00e1 tr\u1ecb kh\u00e1c nhau c\u1ee7a \u0111\u1ea1i l\u01b0\u1ee3ng $y$ l\u00e0 4 v\u00e0 -4 n\u00ean \u0111\u1ea1i l\u01b0\u1ee3ng $y$ kh\u00f4ng ph\u1ea3i l\u00e0 h\u00e0m s\u1ed1 c\u1ee7a \u0111\u1ea1i l\u01b0\u1ee3ng $x$. <br\/> * X\u00e9t b\u1ea3ng 2, ta th\u1ea5y m\u1ed7i gi\u00e1 tr\u1ecb c\u1ee7a $x$ \u0111\u01b0\u1ee3c t\u01b0\u01a1ng \u1ee9ng v\u1edbi m\u1ed9t v\u00e0 ch\u1ec9 m\u1ed9t gi\u00e1 tr\u1ecb c\u1ee7a $y,$ n\u00ean $y$ l\u00e0 h\u00e0m s\u1ed1 c\u1ee7a $x$. <\/span> <br\/><br\/><span class='basic_pink'> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 B. <\/span><\/span> ","column":2}]}],"id_ques":678},{"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":"C\u00e1c gi\u00e1 tr\u1ecb t\u01b0\u01a1ng \u1ee9ng c\u1ee7a hai \u0111\u1ea1i l\u01b0\u1ee3ng $x$ v\u00e0 $y$ \u0111\u01b0\u1ee3c cho trong b\u1ea3ng sau: <table><tr><td>$x$<\/td><td>$-2$<\/td><td>$-1$<\/td><td>3<\/td><td>5<\/td><\/tr><tr><td>$y$<\/td><td>4<\/td><td>1<\/td><td>9<\/td><td>20<\/td><\/tr><\/table> \u0110\u1ea1i l\u01b0\u1ee3ng $y$ c\u00f3 ph\u1ea3i l\u00e0 h\u00e0m s\u1ed1 c\u1ee7a \u0111\u1ea1i l\u01b0\u1ee3ng $x$ kh\u00f4ng? ","select":["C\u00f3 ","Kh\u00f4ng"],"hint":"Xem \u0111\u1ecbnh ngh\u0129a h\u00e0m s\u1ed1. ","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> <b> C\u1ea7n ki\u1ec3m tra \u0111i\u1ec1u ki\u1ec7n: <\/b> <br\/> M\u1ed7i gi\u00e1 tr\u1ecb c\u1ee7a \u0111\u1ea1i l\u01b0\u1ee3ng $x$ \u0111\u01b0\u1ee3c t\u01b0\u01a1ng \u1ee9ng v\u1edbi m\u1ed9t v\u00e0 ch\u1ec9 m\u1ed9t gi\u00e1 tr\u1ecb c\u1ee7a \u0111\u1ea1i l\u01b0\u1ee3ng $y$ hay kh\u00f4ng? <\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> Trong b\u1ea3ng ta th\u1ea5y m\u1ed7i gi\u00e1 tr\u1ecb c\u1ee7a $x$ \u0111\u01b0\u1ee3c t\u01b0\u01a1ng \u1ee9ng v\u1edbi m\u1ed9t v\u00e0 ch\u1ec9 m\u1ed9t gi\u00e1 tr\u1ecb c\u1ee7a $y,$ n\u00ean $y$ l\u00e0 h\u00e0m s\u1ed1 c\u1ee7a $x$. <br\/><br\/><span class='basic_pink'> \u0110\u00e1p \u00e1n l\u00e0 C\u00f3. <\/span><\/span> ","column":2}]}],"id_ques":679},{"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":"C\u00e1c gi\u00e1 tr\u1ecb t\u01b0\u01a1ng \u1ee9ng c\u1ee7a hai \u0111\u1ea1i l\u01b0\u1ee3ng $x$ v\u00e0 $y$ \u0111\u01b0\u1ee3c cho trong b\u1ea3ng sau: <table><tr><td>$x$<\/td><td>6<\/td><td>$-3$<\/td><td>5<\/td><td>10<\/td><\/tr><tr><td>$y$<\/td><td>$-6$<\/td><td>$-10$<\/td><td>7<\/td><td>3<\/td><\/tr><\/table> \u0110\u1ea1i l\u01b0\u1ee3ng $y$ c\u00f3 ph\u1ea3i l\u00e0 h\u00e0m s\u1ed1 c\u1ee7a \u0111\u1ea1i l\u01b0\u1ee3ng $x$ kh\u00f4ng? ","select":["C\u00f3 ","Kh\u00f4ng"],"hint":"Xem \u0111\u1ecbnh ngh\u0129a h\u00e0m s\u1ed1. ","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> <b> C\u1ea7n ki\u1ec3m tra \u0111i\u1ec1u ki\u1ec7n: <\/b> <br\/> M\u1ed7i gi\u00e1 tr\u1ecb c\u1ee7a \u0111\u1ea1i l\u01b0\u1ee3ng $x$ \u0111\u01b0\u1ee3c t\u01b0\u01a1ng \u1ee9ng v\u1edbi m\u1ed9t v\u00e0 ch\u1ec9 m\u1ed9t gi\u00e1 tr\u1ecb c\u1ee7a \u0111\u1ea1i l\u01b0\u1ee3ng $y$ hay kh\u00f4ng? <\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> Trong b\u1ea3ng ta th\u1ea5y m\u1ed7i gi\u00e1 tr\u1ecb c\u1ee7a $x$ \u0111\u01b0\u1ee3c t\u01b0\u01a1ng \u1ee9ng v\u1edbi m\u1ed9t v\u00e0 ch\u1ec9 m\u1ed9t gi\u00e1 tr\u1ecb c\u1ee7a $y,$ n\u00ean $y$ l\u00e0 h\u00e0m s\u1ed1 c\u1ee7a $x$. <br\/><br\/><span class='basic_pink'> \u0110\u00e1p \u00e1n l\u00e0 C\u00f3. <\/span><\/span> ","column":2}]}],"id_ques":680}],"lesson":{"save":0,"level":1}}