X:Y=3:4,Y:Z=6:5=X:Y:Z=( ):( ):( )
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已知3X=4X,5Y=6Z求X+Y:Y+Z
X:Y=3:4,Y:Z=6:5=X:Y:Z=( ):( ):( )
x+y+z=4x-5y=y-x+6z,xyz不等0,x:y:z=?
(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+z=-1 5x+2y-z=6 4x-3y+2z=-5
2x+5y+4z=6,3x+y-7z=-4,x+y-z=?
{2x+3y-4z=-5 x+y+z=6 x-y+3z=10
x+y+z=1 4x+5y-z=6 x+2y-z=3
解方程组x+y+z=6 x+2y-3z=4 2x-y+z=5
解方程组:x+y+z=4,x+y+2z=5,3x+y-z=6
已知2x+5y+4z=6 3x+y-7z=-4求x+y-z
已知x/4=y/5=z/6 求x+y+z/3x-2y+z的值
若x:y:z=3:4:5=6,求x-y+z分之x+y-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