高中数学代数与函数一函数练习题86
题目内容

设 f: http://picflow.koolearn.com/upload/2010-06/25/32af61de-6680-437b-ad7a-17916d025a26/paper.files/image023.gif是集合A到集合B的映射,如果B={1,2},则 http://picflow.koolearn.com/upload/2010-06/25/32af61de-6680-437b-ad7a-17916d025a26/paper.files/image024.gif为(   )

2021-08-04

A.http://picflow.koolearn.com/upload/2010-06/25/32af61de-6680-437b-ad7a-17916d025a26/paper.files/image021.gif

B.{1}

C.http://picflow.koolearn.com/upload/2010-06/25/32af61de-6680-437b-ad7a-17916d025a26/paper.files/image021.gif或{2}

D.http://picflow.koolearn.com/upload/2010-06/25/32af61de-6680-437b-ad7a-17916d025a26/paper.files/image021.gif或{1}

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