令X/2=Y/3=Z/4=t
则X=2t,Y=3t,Z=4t
2X+3Y/z
=(2*2t+3*3t)/4t
=13t/4t
=13/4
解:X/2=Y/3=Z/4=t
则X=2t,Y=3t,Z=4t
2X+3Y/z
=(2*2t+3*3t)/4t
=13t/4t
=13/4
解:根据比例,求得x:y:z=2:3:4,设x=2k,y=3k,z=4k,
把x=2k,y=3k,z=4k代入2X+3Y/Z
2(2k)+3(3k)/(4k)
得:13/4
谢谢采纳。
同意nmkiuhj的回答,正确!
见图。