已知x:y:z=2:3:4,求x-y-z/3x+2y-z的值.若2x+3y-4z=-3,求3x-4y-z的值

来源：学生作业帮编辑：作业帮分类：数学作业时间：2024/11/09 10:43:53

令x=2k,y=3k,z=4k
(x-y-z)/(3x+2y-z)
=(2k-3k-4k)/(3*2k+2*3k-4k)
=-5k/8k
=-5/8
2x+3y-4z=-3
2*2k+3*3k-4*4k=-3
-3k=-3
k=1
3x-4y-z
=3*2k-4*3k-4k
=-10k
=-10*1
=-10

已知x:：y：z=3：4：5,(1)求x+y分之z的值；（2）若x+y+z=6,求x,y,z. 已知2x=3y=4z求2x-y+z分之x+y+z的值已知x:y:z=2:3:4,且x-y+z=36,求x+y+z的值. 已知x/4=y/5=z/6 求x+y+z/3x-2y+z的值已知x/4=y/5=z/6,求x+y+z/3x-2y+z的值. 已知x:y:z=2:3:4,且x+y+z=18,求x,y,z的值已知x:y:z=2:3:4求x-y+z分之x+y-z的值已知x+2y+3z=2 3x+y+2z=3 2x+3y+z=4求X+Y+Z的值已知：x+2y+3z=2,3x+y+2z=3,2x+3y+z=4,求x+y+z的值已知x+4y+3z=3x-2y-5z=0,求x+2y-z/2x-3y+7z的值已知x/2=y/3=z/4,且x+y+z不等于0,求2x+3y-4z/x+y+z的值已知{3x+4y+5z=0,2x+3y-4z=0,求x+y+z/x-y+z的值.