已知x2＝y3＝z4＝k

网友回答

由题意得：x=2k，y=3k，z=4k，
则原式=4k+3k?4k6k?6k+4k
======以下答案可供参考======
供参考答案1:
x/2=y/3=z/4=k
x=2k, y=3k, z=4k
2x+y-z/3x-2y+z
=(4k+3k-4k)/(6k-6k+4k)
=3/4