x+4y=6 5y+2z=50 4x+z=12
1.x+y=16,y+z=12,z+x=102.3x-y+z=4,2x+3y-z=12,x+y+z=63.x+y+z=6
x=y/z=z/3,x+y+z =12,求2x+3y+4z是多少,
2x+5y+4z=6,3x+y-7z=-4,x+y-z=?
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
已知2x+5y+4z=6 3x+y-7z=-4求x+y-z
{2x+3y-4z=-5 x+y+z=6 x-y+3z=10
解方程组:x+y+z=4,x+y+2z=5,3x+y-z=6
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.
1.x+y+z=30,3x+y-z=50,x,y,z为非负数,求5x+4y+2z取值范围.