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下列结论中正确的个数是(  ) ①当 a<0时, http://picflow.koolearn.com/upload/2010-03/09/eabd15df-8bf6-4647-bfb9-663a619a347a/paper.files/image001.gif= a 3 ② http://picflow.koolearn.com/upload/2010-03/09/eabd15df-8bf6-4647-bfb9-663a619a347a/paper.files/image002.gif=| a| ③函数 y= http://picflow.koolearn.com/upload/2010-03/09/eabd15df-8bf6-4647-bfb9-663a619a347a/paper.files/image003.gif-(3 x-7) 0的定义域是(2, +∞) ④若 http://picflow.koolearn.com/upload/2010-03/09/eabd15df-8bf6-4647-bfb9-663a619a347a/paper.files/image004.gif,则2 a+ b=1

发布时间:2021-08-04

B.1

C.2

D.3

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