如何解 3x+2y+6z=28 3x+y+5z=20
解方程组:x+y+z=4,x+y+2z=5,3x+y-z=6
x/2=y/3=z/5 x+3y-z/x-3y+z
试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y)
解方程一;{x+y-z=6,x-3y+2z=1,3x+2y-z=-7.②{3x+4z=7,2x+3y+z=9,5x-9y
解方程:x+2y+3z=8 x+3y+5z=6
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{3x+y-z=4,2x-y+3z=12,x+y+z=6}
解方程{3x -y+z=4 2x+3y-z=12 x+y+z=6
{2x+3y-4z=-5 x+y+z=6 x-y+3z=10
x+2y+3z=20,x+3y+5z=31,求x+y+z的值
2分之x=3分之y=5分之z x+y+z=20 求x,y,z