怎样解方程组x+y=8 y+z=6 z+x=4
怎样解方程组x+y=8 y+z=6 z+x=4
解方程组x-y-3z=4 3x+y-z=6 -x+3y+z=8
解方程组{x(x+y+z)=6,y(x+y+z)=12,z(x+y+z)=18
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
怎样解方程组{x-2y+3z=6,2x+3y-4z=20,3x-2y-5z=6
怎样解三元一次方程组(1)x+y-z=11,y+z-x-5,z+x-y=1
解三元一次方程组:x+y+z=6,y-z=4,x-y-2z=3,
解方程组{6x=4y=3z,2x+y+z=22
解方程组6x=4y=3z,x+y+z=18
解方程组:x:y:z=4:7:8,x+y+2z=54
解方程组 x+y+z=-7 x-y=12 x+y-z=6