已知x-y=3xy,求5x+2xy-5y/x-4xy-y的值
问题描述:
已知x-y=3xy,求5x+2xy-5y/x-4xy-y的值
答
5x+2xy-5y/x-4xy-y
=5(x-y)+2xy/(x-y)-4xy
=5*3xy+2xy/3xy-4xy
=17xy/(-xy)
=-17