解方程组{x=1 2x+3y=8 x+3y+4z=19
解方程组{x=1 2x+3y=8 x+3y+4z=19
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x-y-3z=4 3x+y-z=6 -x+3y+z=8
解方程组{3x+y-z=4,2x-y+3z=12,x+y+z=6}
解方程组:x-2y+z=-1,x+y+z=2,x+2y+3z=-1
解方程组x-4y+z=-3,2x+y-z=18,x-y-z=7.
x+y/2=z+x/3+y=z/4,...x+y+z=27.解方程组.
解方程组:x+y+z=4,x+y+2z=5,3x+y-z=6
解三元一次方程组:x+y+z=6(1) x+2y+3z=14(2) 3x+4y-z=8(3) 急
解方程组:{x/2=y/3=z/4 2x+y+z=22
解方程组:x+2y+3z=80,x/2+y/3=z/4,
x/2=y/3=z/4 x+y+z=18 求方程组解