｛-2y+3y=-6 3y+2z=0 4x-3z=5

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 如果|x+y+z-6|+|2x+3y-z-12|+|2x-y-z|=0求x,y, x/2=y/3=z/5 x+3y-z/x-3y+z 已知3x-2y-5z=0,2x-5y+4z=0,且x,y,z均不为0,求3x*x+2y*y+5z*z/5x*x+y*y- {2x+3y-4z=-5 x+y+z=6 x-y+3z=10 2x+5y+4z=0,3x+y-7z=0,则x+y-z=? 2x+5y+4z=6,3x+y-7z=-4,x+y-z=? 解方程组：x+y+z=4,x+y+2z=5,3x+y-z=6 已知方程组4x-5y+2z=0 x+2y=3z 则x:y:z 已知2x+5y+4z=6 3x+y-7z=-4求x+y-z 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