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高中数学高考真题压轴题 构造周期函数，求一个抽象函数值 妙！
已知函数f(x)是定义在实数集R上的不恒等于零的偶函数， 且对任意实数x都有xf(x＋1)＝(1＋x)f(x)，则f 52的值是___． 一个解题思路的形成过程
高考中的函数题9/57
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