(1)x(x-y)2+x(x+y)(y-x)+2(x-y) (2)2(m2+n2)(m+n)2-(m2-n2)2

问题描述:

(1)x(x-y)2+x(x+y)(y-x)+2(x-y) (2)2(m2+n2)(m+n)2-(m2-n2)2

(1) x(x-y)²+x(x+y)(y-x)+2(x-y)=(x-y)[x(x-y)+x(x+y)+2]=(x-y)[x(x-y+x+y)+2]=(x-y)(2x²+2)=2(x-y)(x²+1)(2) 2(m²+n²)(m+n)²-(m²-n²)²=2(m²+n&...