已知x-y=3xy,则2x+3xy−2yx−2xy−y=_.
问题描述:
已知x-y=3xy,则
=______. 2x+3xy−2y x−2xy−y
答
∵x-y=3xy,
∴
2x+3xy−2y x−2xy−y
=
2(x−y)+3xy (x−y)−2xy
=
6xy+3xy 3xy−2xy
=
9xy xy
=9,
故答案为:9.