原式=(x-2y)²+2(x-2y)
=(x-2y)(x-2y+2)30-11x^m-30x^2m ,x^2+7/12x-1,72x^4-50x^2y^2+8y^4,2(x+y)^2+(x+y)(x-y)-6(x-y)^2,(x-y)(2x-2y-3)-2 回答我好不好 求这位大虾了！！！我嫌太多你分开问行不行好，您等等，只要您肯回答就行！算了，我做