8m^2*n(x-y)^2-4mn^2*(y-x)^2
1个回答
8m^2*n(x-y)^2-4mn^2*(y-x)^2
=8m^2*n(x-y)^2-4mn^2*(x-y)^2
=4mn(x-y)^2*(2m-n)
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