x-5y-3z=0 y+4z=3 2x-z=1
{x+y+z=1;x+3y+7z=-1;z+5y+8z=-2
2x+5y+4z=0,3x+y-7z=0,则x+y-z=?
已知方程组4x-5y+2z=0 x+2y=3z 则x:y:z
x/2=y/3=z/5 x+3y-z/x-3y+z
x-y-z=-1 3x+5y+7z=11 4x-y+2z=-1 分别求出x=?y=?z=?
已知x+4y+3z=3x-2y-5z=0,求x+2y-z/2x-3y+7z的值
已知{3x+4y+5z=0,2x+3y-4z=0,求x+y+z/x-y+z的值.
已知2x+3y-4z=0,3x+4y+5z=0,求x+y+z/(除以)x-y+z的值.
已知2x+3y-4z=0,3x+4y+5z=0,求x+y+z/x-y+z的值.
已知3x+4y+5z=0,2x+3y-4z=0,求(x+y+z)/(x-y+z)
2x+3y-4z=0,3x+4y+5z=0,求x+y-z/x-y+z的值
2x+3y-4z=0.,3x+4y+5z=0,则x+y+z/x-y+z详细的解题过程