若f(u,v,w)=(u-v)^w+w^(u+v) 则f(x+y,x-y,xy)=若f(u,v,w)=(u-v)^w+w^(u+v)则f(x+y,x-y,xy)=

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若f(u,v,w)=(u-v)^w+w^(u+v) 则f(x+y,x-y,xy)=若f(u,v,w)=(u-v)^w+w^(u+v)则f(x+y,x-y,xy)=
若f(u,v,w)=(u-v)^w+w^(u+v) 则f(x+y,x-y,xy)=
若f(u,v,w)=(u-v)^w+w^(u+v)
则f(x+y,x-y,xy)=

若f(u,v,w)=(u-v)^w+w^(u+v) 则f(x+y,x-y,xy)=若f(u,v,w)=(u-v)^w+w^(u+v)则f(x+y,x-y,xy)=
若f(u,v,w)=(u-v)^w+w^(u+v)
f(x+y,x-y,xy)
=[(x+y)-(x-y)]^xy+(xy)^[(x+y)+(x-y)]
=(2y)^xy+(xy)^2x

若f(u,v,w)=(u-v)^w+w^(u+v) 则
f(x+y,x-y,xy)
=[(x+y)-(x-y)]^(xy)+(xy)^[(x+y)+(x-y)]
=(2y)^(xy)+(xy)^(2x)