x/3=y/6=z/8 3x+5y-6z=-18 求x,y,z
已知3X=4X,5Y=6Z求X+Y:Y+Z
如果|x+y+z-6|+|2x+3y-z-12|+|2x-y-z|=0求x,y,
5x+3y+2z=2011 4x+6y+7z=2012 求x+y+z
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2x+5y+4z=6 3x+y-7z=-4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4x-3y-6z=0,x+2y-7z=0,求代数式5x*5x+2y*2y-z*z/2x*2x-3y*3y-10z*10
已知3X+7Y+Z=6 4X+10Y+z=7 求X+Y+Z=?
解方程组{x(x+y+z)=6,y(x+y+z)=12,z(x+y+z)=18
已知方程组3x+5y+3z=0,3x-5y-8z=0,并且z≠0,求x:z和y:z