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下列函数为偶函数的是( )
A
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试题答案:
B
答案解释:
【考点指要】本题考查函数的奇偶性概念,并要求会判断函数的奇偶性.判断函数的奇偶性应先判断函数的定义域关于原点是否对称.如果对称,则根据?(x)=-?(-x)或?(-x)=?(x)来判断函数为奇函数或偶函数;如果函数定义域美于原点不对称。则函数非奇非偶.此类题是历年成人高考的重点题.
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