x^2(x^2-y^2)+m^(y^2-x^2)=x^2(x^2-y^2)-m^(x^2-y^2)=(x2-m2)(x2-y2)=(x+m)(x-m)(x+y)(x-y)
x^2(x^2-y^2)+m^(y^2-x^2)因式分解
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