{3X-4y=18 ,{6Y-Z=-19,{2X-3Y+4Z=17
2x-y+2z=-17 3x+y-3z=-4 x+y+z=6
2X+Y+Z=10,X+2Y+Z=-6,X+Y+2Z=8 5X+4Y-3Y=13,2X-3Y+7Z=19,3X-Y=2X
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,
x+2y+4z=17 2x+y+z=7 3x+y+2z=11
x+y+z=4 2x+3y-z=6 3x+2y+2z=10
解方程组x-4y+z=-3,2x+y-z=18,x-y-z=7.
2x+5y+4z=6,3x+y-7z=-4,x+y-z=?
{2x+3y-4z=-5 x+y+z=6 x-y+3z=10
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x:y:z=2:3:4,且x+y+z=18,求x,y,z的值