解方程{3x -y+z=4 2x+3y-z=12 x+y+z=6

解方程{3x -y+z=4 2x+3y-z=12 x+y+z=6 3x-y+z=3 2x+y-3z=11 x+y+z=12 解方程 解方程：{2x+3y+z=7,x+y+z=4,3x+y-z=-4 解方程组{3x+y-z=4,2x-y+3z=12,x+y+z=6} 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 x=y/z=z/3,x+y+z ＝12,求2x+3y+4z是多少, 1.x+y=16,y+z=12,z+x=102.3x-y+z=4,2x+3y-z=12,x+y+z=63.x+y+z=6 如果|x+y+z-6|+|2x+3y-z-12|+|2x-y-z|=0求x,y, 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:x+2y+3z=8 x+3y+5z=6 解方程组：x+y+z=4,x+y+2z=5,3x+y-z=6 ①x+y+z=6 3x-y+2z=12 x-y-3z=-4 ②x+y-z=2 4x-2y+3y+8=0 x+3y-2z-