解方程组:-x+2y+3z=12 2x-2y+5z=13 3x+2y+z=10
解方程组{z=x+y 3x-2y-2z=-5 2x+y-z=3
解方程组 z=x+y 2x-3y+2z=5 x+2y-z=3
解方程组{3x+y-z=4,2x-y+3z=12,x+y+z=6}
解方程组:x+y+z=4,x+y+2z=5,3x+y-z=6
解方程组:-x+2y+3z=12 2x-2y+5z=13 3x+2y+z=10
解三元一次方程组方程组 -x+2y+3z 2x-2y+5z=13 3x+2y+z=10
x:y:z=2:3:5解方程组 2x+3y-z=16
解方程组:x+3y=5.y-2z=5.x+z=5
解二元一次方程组X:Y:Z=1:2:3,X+Y+Z=12
解方程组:x-2y+z=-1,x+y+z=2,x+2y+3z=-1
解方程组{2x+3y+z=11,x+y+z=0,3x-y+z=-2.
解方程组x-4y+z=-3,2x+y-z=18,x-y-z=7.