高中数学代数与函数一函数练习题86
题目内容

设A= http://picflow.koolearn.com/upload/2010-09/14/cbd349fe-b58b-4385-b119-602201d87868/paper.files/image026.gif,B= http://picflow.koolearn.com/upload/2010-09/14/cbd349fe-b58b-4385-b119-602201d87868/paper.files/image027.gif,从集合A到集合B的映射中,满足 http://picflow.koolearn.com/upload/2010-09/14/cbd349fe-b58b-4385-b119-602201d87868/paper.files/image028.gif的映射有(  )

2021-08-04

A.27个

B.9个

C.21个

D.12个

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