x：y=3:4 y：z=5:4 x+y+z=66 求x,y,z的值.

(4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuaihuajian (4x-2y-z)-{5x-[8y-2z-(x-2y)]-x-(3y-10z)}=? (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 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=5 2x+3y-z=9 x-y+z=4 已知3X=4X,5Y=6Z求X+Y：Y+Z (4x-2y-z)-{5x-[8y-2z-(x+y)]-2(3y-10z)}=?好难啊 x+y/2=z+x/3=y+z/4 x+y+z=27 x+2y=3x+2z=4y+z 求x:y:z X:Y=3:4,Y:Z=6:5=X:Y:Z=( ):( ):( ) x:y=3:2 y:z=5:4 x+y+z=66 x:y=3:2 y:z=5:4 x+y+z=66 {x:y=2:3 y:z=4:5 x+y+z=35 x:y=2:3 y:z=4:5 x+y+z=35 x+y+z=111,y:x=3:2,y:z=5:4 3x=4y 2y=5z 试求x:y:z 已知5x=3y,4z=7y,求x:y:z x/3=y/4=z/5求x-y+z/y急用