设x/2=y/3=z/4=t
则x=2t,y=3t,z=4t
∴（x-y+2z)/(3x-y) 【 分子应该是x-y+2z】
=(2t-3t+8t)/(6t-3t)
=(7t)/(3t)
=7/3谢谢我这题写错了是求3X-Y分之X-Y+3Z的值按照你的讲解得数是不是3分之11啊望回答谢谢∴（x-y+3z)/(3x-y)=(2t-3t+12t)/(3t)=11/3对的