x+y=-2 x+z=13 y+z=1 解方程组
解方程组:x-2y+z=-1,x+y+z=2,x+2y+3z=-1
解方程组2x+y-z=7 x+y+z =1 2x-y-z=5
解方程组2x+y-3z=1,x-2y+z=6,3x-y+2z=9求x,y,z的值
解方程组x+y=13,y+z=9,x+z=2
求方程组 {x+y-z=1 2x+3y-z=13
解方程组{x:y:z=1:2:3 {2x+y-3z=15
解二元一次方程组X:Y:Z=1:2:3,X+Y+Z=12
解三元一次方程组x:y:z=1:2:3 x+y+z=36
解方程组{x(x+y+z)=6,y(x+y+z)=12,z(x+y+z)=18
解方程组x+2y-z=1 ,3x-3y+z=2,2x+3y+z=7和方程组x+y=-14,y+z=-7,x+z=19
解方程组;1.x+y+z=26,x-y=1,2x-y+z=18 2.5x+y+z=1,2x-y+2z=1,x+5y-z=
解方程组:2x+2y+z=1 x-2y-3z=-13 3x+2y+5z=11