解方程组x-y-z=5 2x+2y-z=15 2x+3y=18
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x-4y+z=-3,2x+y-z=18,x-y-z=7.
解方程组:x+y+z=4,x+y+2z=5,3x+y-z=6
解方程组{x:y:z=1:2:3 {2x+y-3z=15
x/2=y/3=z/4 x+y+z=18 求方程组解
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
解方程组﹛x+2y+3Z=15 3x-6y-z=5 2x-4y+3z=18
解方程组:2x+y+z=15 x+2y+z=16 x+y+z=17
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