能解几道就几道计算或者化简下列各式：(因技术问题 字母后面的2是指平方)1.（x2+2xy+y2)(x2-xy+y2)22.x2+3x+9\x2-27 + 6x\9x-x2 - x-1\6+2x分解因式：1.a7-ab62.ab(c2-d2)-(a2-b2)cd

1.（x2+2xy+y2)(x2-xy+y2)2
=(x+y)^2(x2-xy+y2)2
=[(x+y)(x2-xy+y2)]^2
=(x^3+y^3)^2
1.a7-ab6
=a(a^6-b^6)
=a(a^3+b^3)(a^3-b^3)
2.ab(c2-d2)-(a2-b2)cd
=abc^2-abd^2-a^2cd+b^2cd
=ac(bc-ad)+bd(-ad+bc)
=(bc-ad)(ac+bd)