已知x-y=3xy,求2x+3xy-2y/x-2xy-y

问题描述:

已知x-y=3xy,求2x+3xy-2y/x-2xy-y

2x+3xy-2y/x-2xy-y
=[2(x-y)+3xy]/[(x-y)-2xy]
=(6xy+3xy)/(3xy-2xy)
=9