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【题目】设α∈{2,1,,1,2,3},则使f(x)=xα为奇函数,且在(0,+∞)上递增的α的个数是( )

A.1 B.2 C.3 D.4

【答案】C

【解析】f(x)为奇函数,则α=1,,13

f(x)在(0,+∞)上递增,则α=,13,故选C.

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