f(x+y)=f(x)+f(y)+2xy
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f(x+y)=f(x)+f(y)+2xy
f(xy)=f(x)+f(y),证明f(x/y)=f(x)-f(y)
f(x+y)+f(xy-1)=f(x)f(y)+2f(n)表达式
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f(xy)=f(x)+f(y),f(2)=1,f(3)=?
f(xy)=f(x)+f(y)且f(8)=3则f(2)=
f(xy)=f(x)+f(y),f(8)=3,则f(根2)等于
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设f(x+y,x-y)=x^2+xy,求f(x,y)