高中数学代数与函数一其他练习题89
题目内容

已知函数f(x)的定义域为R,对任意 http://picflow.koolearn.com/upload/papers/20140824/20140824023513585433.png,有 http://picflow.koolearn.com/upload/papers/20140824/20140824023513601624.png,且 http://picflow.koolearn.com/upload/papers/20140824/20140824023513617551.png,则f(x)<3x+6的解集为(  )

2021-07-16

A.(-1, 1)

B.(-1,+http://picflow.koolearn.com/upload/papers/20140824/20140824023513648313.png

C.(-http://picflow.koolearn.com/upload/papers/20140824/20140824023513648313.png,-1)

D.(-http://picflow.koolearn.com/upload/papers/20140824/20140824023513648313.png,+http://picflow.koolearn.com/upload/papers/20140824/20140824023513648313.png

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