解方程组x-2y=-9 y-z=3 2z+x=47
解方程组x-2y=-9 y-z=3 2z+x=47
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{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-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{3x+y-z=4,2x-y+3z=12,x+y+z=6}
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
帮我解方程组:3x-y+z=3,2x+y-3z=11,x+y+z=12.x=?y=?z=?
解三元一次方程组:x+y+z=6,y-z=4,x-y-2z=3,