共50条信息
对于函数\(f\):\(A→B\),其值域是集合\(B.\)( )
若\(A=R\),\(B=\{x|x > 0\}\),\(f\):\(x→y=|x|\),则对应关系\(f\)是从\(A\)到\(B\)的映射\(.\)( )
设\((a,b)\)在映射\(f\)下的像为\((a+b,a-b)\),则\((2,-1)\)的原像是( )
\(A=\{a_{1},a_{2},a_{3}\}\),\(B=\{b_{1},b_{2},b_{3},b_{4},b\}\),从集合\(A\)到集合\(B\)的映射\(f\)满足\(f(a_{1}) < f(a_{2}) < f(a_{3})\),则这样的映射\(f\)个数为\((\) \()\)
设\(f:x→\left|x\right| \)是集合\(A\)到集合\(B\)的映射,且集合\(B\)中的每一个元素都有原象,若\(A=\left\{-2,0,2\right\} \),则\(A∩B \)等于\((\) \()\)
D.\(\{1\}\)
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