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算了,一次提完吧,11.分解因式:(1)(x+y)(x+y+2xy)+(xy+1)(xy-1)(2)(x+y)(x+y+

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算了,一次提完吧,
11.分解因式:(1)(x+y)(x+y+2xy)+(xy+1)(xy-1)
(2)(x+y)(x+y+2xy)+(xy+1)(xy-1)
12.若a-b=2,a-c=1/2,求(b-c)^2-3(b-c)+9/4的值.
13.解方程:(x-2)(x+3)+(2-x)^2-(x-2)(2x-3)=20
14.算一算:1+2=?
求你们全部回答吧
算了,一次提完吧,11.分解因式:(1)(x+y)(x+y+2xy)+(xy+1)(xy-1)(2)(x+y)(x+y+
1+2=3