- CarieVinne
- wio
-
(1) a(x+y)+(a-b)(x+y)=(a+(a-b))(x+y)=(2a-b)(x+y)
(2)9(a-b)^2-(x-y)^2=(3(a-b))^2-(x-y)^2=[3(a-b)-(x-y)][(3(a-b)+(x-y)]
(3) x^2-y^2+4x+4=(x^2+4-4x)-y^2=(x-2)^2-y^2=(x-2+y)(x-2-y)
- meira
-
1)=(x十y)(2a一b)
z)=[3(a一b)十(x一y)][3(a一b)一(x一y)]
=(3a一3b十x一y)(3a一3b一x十y)
- 我不懂运营
-
1.【X+Y][2A-B] 2.不知 3.X[X+4]+4-Y的平方
- ardim
-
自已看书吧
- 里论外几
-
不会做?还是?
- nicehost
- 马老四