摘要:2.下列四组函数中.f (x)与g (x)表示同一个函数的是( ) A.f (x) = |x|.g(x) = ()2 B.f (x) = 2x.g (x) = C.f (x) = x.g (x) = D.f (x) = x.g (x) =

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