单选题:若偶函数f(x)在区间[0,2]上单调递减,则 ( )

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题目内容:
若偶函数f(x)在区间[0,2]上单调递减,则 ( )

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答案解析:

若x,y∈R+,且x+y=1,则x2+y2的最小值是 ( )

若x,y∈R+,且x+y=1,则x2+y2的最小值是 ( )

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