令a= x/2=y/3=z/4x=2a,y=3a,z=4a代入2x-y+3z=264a-3a+12a=2613a=26a=2所以x=2a=4y=3a=6z=4a=8
设x/2=y/3=z/4=K 2x-y+3z=13K=26K=2X=4Y=6Z=8
