已知函数f (x) =|x2-2ax+b| (x∈R),给出下列命题:①f (x)必是偶函数;②当f (0) =已知函数f (x) =|x2-2ax+b| (x∈R),给出下列命题:①f (x)必是偶函数;②当f (0) = f (2)时,f (x)的图象必关于直线x = 1对称;

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