-6x+5y-3z=-4 6x-3y+z=8 6x+y+4z=9 怎么解
解方程组x-y-3z=4 3x+y-z=6 -x+3y+z=8
解方程组:x+y+z=4,x+y+2z=5,3x+y-z=6
解方程一;{x+y-z=6,x-3y+2z=1,3x+2y-z=-7.②{3x+4z=7,2x+3y+z=9,5x-9y
已知3X=4X,5Y=6Z求X+Y:Y+Z
2x+4y+3z=9 3x-2y+5z=11 5x-6y+7z=13 这个方程怎么解?
解方程组{3x+y-z=4,2x-y+3z=12,x+y+z=6}
解方程{3x -y+z=4 2x+3y-z=12 x+y+z=6
2x+5y+4z=6,3x+y-7z=-4,x+y-z=?
{2x+3y-4z=-5 x+y+z=6 x-y+3z=10
已知2x+5y+4z=6 3x+y-7z=-4求x+y-z
3x+7y+z=5 ,4x+10y+z=6 ,x+y+z=
5x+3y+2z=2011 4x+6y+7z=2012 求x+y+z