f'(0)=1,f(x+y)=f(x)+f(y)+2xy,求f(x)
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f'(0)=1,f(x+y)=f(x)+f(y)+2xy,求f(x)
f'(0)=1,f(x+y)=f(x)+f(y)+2xy,求f(x)
f'(0)=1,f(x+y)=f(x)+f(y)+2xy,求f(x)
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