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设f(x)是R上的函数,且满足f(0)=1,并且对于任意的实数x,y都有f(x-...
设f(x)是R上的函数,且满足f(0)=1,并且对于任意的实数x,y都有f(x-y)=f(x)-y(2x-y+1)成立,则f(x)= .
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D.
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