若x+y=5xy,则(2x+2y-3xy)/(2xy+x+y)=? 急急急 快快快!

问题描述:

若x+y=5xy,则(2x+2y-3xy)/(2xy+x+y)=? 急急急 快快快!

=7xy/7xy
=1

原式=[2(x+y)-3xy]/[(x+y)+2xy]
=[2(5xy)-3xy]/[(5xy)+2xy]
=7xy/7xy
=1

(2x+2y-3xy)/(2xy+x+y)
=[2(x+y)-3xy]/[(x+y)+2xy]
=(10xy-3xy)/(5xy+2xy)
=7xy/7xy
=1
如果本题有什么不明白可以追问,