设x/2=y/3=z/4=m,x=2m,y=3m,z=4m,(2x+3y+4z)/(5x-2y)=(4m+9m+16m)/(10m-6m)=29/4
令x/2=y/3=z/4=k
则x=2k,y=3k,z=4k
所以(2x+3y+4z)/(5x-2y)
=(4k+9k+16k)/(10k-6k)
=29k/4k
=29/4
x/2=y/3=z/4=k(k≠0的常数)
x=2k,y=3k,2=4k
(4k+9k+16k)/(10k-6k)=29/4
设x=2,y=3,z=4,直接带入就得出答案
4/29