F(XY,X-Y)=X2+Y2求F(X,Y)=?
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F(XY,X-Y)=X2+Y2求F(X,Y)=?
F(XY,X-Y)=X2+Y2求F(X,Y)=?
F(XY,X-Y)=X2+Y2求F(X,Y)=?
设 a = XY ,b = X-Y ===>
F(a,b) = F(XY,X-Y) = X^2 + Y^2 = b^2 + 2a
再把 a,b 换成 x,y
F(x,y) = y^2 + 2x
f(x-y,xy)=x2+y2f(x-y,xy)=x2+y2 求f(x.y)
F(XY,X-Y)=X2+Y2求F(X,Y)=?
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