因式分解x+y+xy+1如题
问题描述：
因式分解x+y+xy+1
如题
答
=x+xy+y+1
=(x+xy)+(y+1)
=x(1+y)+(1+y)
=(1+y)(x+1)
答
x+y+xy+1
=(x+xy)+(y+1)
=x(y+1)+(y+1)
=(x+1)(y+1)
答
x+y+xy+1
=x(1+y)+(y+1)
=(x+1)(y+1)