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有如下一道试题: 函数,定义在实数域上,并满足如下条件:对任何x,f(2+x)=f(2-x),而且f(7+x)=f(7-x)。若x=0是f(x)=0的一个根,求f(x)=0在区间-1000≤x≤1000中至少应有几
There are the following questions: The function is defined in the real field and satisfies the following conditions: for any x, f(2+x) = f(2-x), and f(7+x) = f(7-x) . If x=0 is a root of f(x)=0, find that f(x)=0 should be at least a few in the interval -1000≤x≤1000.