初二计算题：-（x-y）²乘以（-x-y)的4次方=?（注意：要速度,而且还要细解,甚至要把每一个括号、几次方的来源解答清楚!）

-(x-y)^2(-x-y)^4=-(x-y)^2(x+y)^2(x+y)^2=-(x^2-y^2)^2(x+y)^2=-[(x^2-y^2)(x+y)]^2=-[x^3-xy^2+yx^2-y^3]^2=-[x^6+x^2y^4+y^2x^4+y^6-2x^4y^2+2yx^5-2x^3y^3-2x^3y^3+2xy^5-2x^2y^4]=-[x^6++2yx^5-x^4y^2-4x^3y^3-...