共50条信息
映射\(f:A→B\),在\(f\)作用下\(A\)中元素\(\left( x,y \right)\)与\(B\)中元素\(\left( x-1,3-y \right)\)对应,则与\(B\)中元素\(\left( 0,1 \right)\)对应的\(A\)中元素是 \((\) \()\)
\(9.\)已知\(a\),\(b\)为两个不相等的实数,集合\(M\)\(=\{\)\(a\)\({\,\!}^{2}-4\)\(a\),\(-1\}\),\(N\)\(=\{\)\(b\)\({\,\!}^{2}-4\)\(b\)\(+1\),\(-2\}\),映射\(f\):\(x\)\(→\)\(x\)表示把集合\(M\)中的元素\(x\)映射到集合\(N\)中仍为\(x\),则\(a\)\(+\)\(b\)等于\((\) \()\)
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