证f(x+y)+f(x-y)=2f(x)f(y)为偶函数能否取-y?f(x+y)+f(x-y)=2f(x)f(y)取-y即把y换成-yf(x+y)+f(x-y)=2f(x)f(-y)比较两式得f(y)=f(-y)所以为偶函数?那为什么书上不这么证
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