Question

(X+y)(x-y)的平方-(x-y)(x的平方-y的平方）求平方差解答过程,感谢

Answer 1

（x+y）(x-y)^2-(x-y)(x^2-y^2)=（x+y）(x-y)^2-(x-y)(x+y)(x-y)=（x+y）(x-y)^2-（x+y）(x-y)^2=0?

(3m^2+5)(-3m^2+5)-m^2(7m+4)(7m-4)-16m^2=(25-9m^4)-m^2(49m^2-16)-16m^2=25-58m^4?