设函数f(x)是定义在R上的奇函数,若当x∈(0,+∞)时,f(x)=lgx,则满足f(x)>0的x的取值范围是( )
A. (-1,0)
B. (1,+∞)
C. (-1,0)∪(1,+∞)
D. (-1,+∞)
人气:132 ℃ 时间:2019-10-23 05:51:48
解答
由题意及对数函数的性质得函数在(0,1)上函数值小于0,在(1,+∞)函数值大于0,
又函数f(x)是定义在R上的奇函数,
∴函数f(x)在(-1,0)函数值大于0
∴满足f(x)>0的x的取值范围是(-1,0)∪(1,+∞)
故选C
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