初一 数学 因式分解，快，明天要交 请详细解答,谢谢! (12 19:29:30)

1.x^2(2y-1)x+y(y-1) 题是不是写错了
2.a(x-y)^2-12a(x^2-y^2)+36a(x+y)^2
=a[x^2+y^2-2xy-12x^2+12y^2+36x^2+36y^2+72xy]
=a[25x^2+49y^2+70xy]
=a(5x+7y)^2

(1)原式=2x^3y-x^3+y^2-y
看不懂你啥意思

(2)原式=a[(x-y)^2-12(x^2-y^2)+36(x+y)^2]
=a[(x-y)^2-12(x+y)(x-y)+36(x+y)^2]
=a[(x-y)-6(x+y)]^2
=a(x-y-6x-6y)^2
=a(-5x-7y)^2
=a(5x+7y)^2

这么简单，自己做吧！

好麻烦

拜托！写清楚点啊，我比你高几级都看不懂？