3x-5y-6z=4,2x-2y-3z=5 2x-3y-4z=4 解方程,
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
解方程{3x -y+z=4 2x+3y-z=12 x+y+z=6
解方程组:x+y+z=4,x+y+2z=5,3x+y-z=6
解方程:{2x+3y+z=7,x+y+z=4,3x+y-z=-4
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
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.
3x-5y-6z=4,2x-2y-3z=5 2x-3y-4z=4 解方程,
2x+4y+3z=9 3x-2y+5z=11 5x-6y+7z=13 这个方程怎么解?