已知x:y:z=3:5:6,且2x-3y+3z+36,求3x+y-2z的值

问题描述:

已知x:y:z=3:5:6,且2x-3y+3z+36,求3x+y-2z的值

设x:y:z=3:5:6=k,所以:x=3k,y=5k,z=6k
因为:2x-3y+3z=36,所以:6k-15k+18k=36
即:9k=36,所以:k=4
所以:3x+y-2z=9k+5k-12k=2k=8