2x-5y=-11 7y+4z=5 5x+2z=2
x-y-z=-1 3x+5y+7z=11 4x-y+2z=-1 分别求出x=?y=?z=?
x/2=y/3=z/5 x+3y-z/x-3y+z
已知2x+5y+4z=6.3x+y-7z=-4 求 x+2y+z
2x+5y+4z=6,3x+y-7z=-4,x+y-z=?
2x+5y+4z=0,3x+y-7z=0,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
若4x=7y+5z,2x+y=z,则x:y:z的值为
已知4X=7Y+5Z,2X+Y=Z,那么X:Y:Z的值是?
已知x+4y+3z=3x-2y-5z=0,求x+2y-z/2x-3y+7z的值
{x+y+z=1;x+3y+7z=-1;z+5y+8z=-2
{5x-3y+z=2{5x+2y-4z=3{-5x+y-z=2 {x-y-z=-1{3x+5y+7z{4x-y+2x=-