题目内容

函数f(x)= http://picflow.koolearn.com/upload/papers/20140824/20140824003022093335.png其中P,M为实数集R的两个非空子集,又规定f(P)={y|y=f(x),x∈P},f(M)={y|y=f(x),x∈M}.给出下列四个判断:①若P∩M= http://picflow.koolearn.com/upload/papers/20140824/20140824003022109187.png,则f(P)∩f(M)= http://picflow.koolearn.com/upload/papers/20140824/20140824003022109187.png;  ②若P∩M≠ http://picflow.koolearn.com/upload/papers/20140824/20140824003022109187.png,则f(P)∩f(M) ≠ http://picflow.koolearn.com/upload/papers/20140824/20140824003022109187.png;③若P∪M=R,则f(P)∪f(M)=R; ④若P∪M≠R,则f(P) ∪f(M)≠R其中正确判断的有( ) 

2021-07-26

A.0个

B.1个

C.2个

D.4个

题目答案

一对一服务

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