已知x-2y=3,则(2x+y-6)/(3x-y-9)=?

问题描述:

已知x-2y=3,则(2x+y-6)/(3x-y-9)=?

x-2y=3
则:x=2y+3
代入原式,原式=(4y+6+y-6)/(6y+9-y-9)
=5y/5y
=1