Question

把(x+y),(x-y)个作为一个整体合并同类项

1，7(x+y)-2(x+y)-4(x+y)+2(x+y)
2，(x-y)²＋2(x-y)－(x-y)－2(x-y)²

Answer 1

1，7(x+y)-2(x+y)-4(x+y)+2(x+y)
=3(x+y)

2，(x-y)²＋2(x-y)－(x-y)－2(x-y)²
=-(x-y)²＋(x-y)

Answer 2

1，7(x+y)-2(x+y)-4(x+y)+2(x+y)
=(7-2-4+2)(x+y)
=3(x+y)

2，(x-y)²＋2(x-y)－(x-y)－2(x-y)²
=-(x-y)²+(x-y)

追问

你也很好，谢谢

追答

不用谢谢了，我的应该是先回答，你不采纳，我也没有办法