若x:y:z=3:4:5=6,求x-y+z分之x+y-z的值

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. 若x:y:z=3:4:5=6,求x-y+z分之x+y-z的值 已知3X=4X,5Y=6Z求X+Y：Y+Z 若x/3=y/4=z/5,求x+y+z/3x-2y+z的值. 已知2x+5y+4z=6 3x+y-7z=-4求x+y-z 若x:y:z=3:4:5且x+y+z=24,求x、y、z的值 若x:y:z=3:4:5 x+y+z=24 求x,y,z的值 若X:y:Z=3:4:5,且X+Y+Z=24,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. 5x+3y+2z=2011 4x+6y+7z=2012 求x+y+z 方程组{x/2+y/3-z=-5,x/3-y/2+z/2=10,x/2-y/3-z/4=6,求x,y,z 已知4x-3y-6z=0,x+2y-7z=0,求5x+2y-z/2x-3y-10z 若实数x,y,z满足x+y+z=4[√(x-5)+√(y-4)+√(z-3)]求x,y,z的值 (x+y):(y+z):(z+x)=3:4:5 3x+y-z=-4已知(x+y):(y+z):(z+x)=3:4:5 ；3x+y-z=-4求x y z 6x+5y+3z=100 x+y+z=30 求 x y 设|x|-|y|+|z|=|x+y+z|,且|x+y|=4,|y+z|=5,|y|=3,求(x-y-z)^2的值 x+y-z=3 y+z-x=5 z+x-y=7 求x,y,z