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已知在(-∞,+∞)上是增函数,则实数a的取值范围是( ) A.(-∞,1] B...
已知
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在(-∞,+∞)上是增函数,则实数a的取值范围是( )
A.(-∞,1]
B.[-1,4]
C.[-1,1]
D.(-∞,1)
考点分析:
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