解方程组x+y=-2,y+z=-4,z+x=-12 解方程组x+y=-2,y+z=-4,z+x=-12
解方程组{3x+y-z=4,2x-y+3z=12,x+y+z=6}
解方程组{x(x+y+z)=6,y(x+y+z)=12,z(x+y+z)=18
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,y-z=4,x-y-2z=3,
解方程组:{x/2=y/3=z/4 2x+y+z=22
解方程组 x+y+z=-7 x-y=12 x+y-z=6
x/2=y/3=z/4 x+y+z=18 求方程组解
解方程组{6x=4y=3z,2x+y+z=22
解二元一次方程组X:Y:Z=1:2:3,X+Y+Z=12
解方程组:x+2y+3z=80,x/2+y/3=z/4,