解方程｛x+y+z=4 ①,2x+y+3z=9 ②,x+3y+2z=14 ③

解方程：x+y+z=0 ① 4x+2y+z=3 ② 9x+3y+z=6 ③ 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：{2x+3y+z=7,x+y+z=4,3x+y-z=-4 解方程{3x -y+z=4 2x+3y-z=12 x+y+z=6 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+y+2z=7① 2x+3y-z=12② 3x+2y+z=13③ 解方程x-y+z=5,①2x+y-3z=15②,3x-2y+z=16③ 解关于w,x,y,z的方程w+8x+3y+5z=20①,4w+7x+2y+3z=-20②,6w+3x+8y+7z=20③ 3x-y+z=3 2x+y-3z=11 x+y+z=12 解方程 解方程{①2x-y+z=6②-3x+2y-z=-9③x+y-2y=-1 解三元一次方程组：（一）2x+y+z=4① x-y+3z=3 ②x+z=2③ 二；①2x+y+z=2 ②x+2y+z=5 已知x/2=y/4=z/7,求①x：y：z.②若2x+y+3z=58,分别求x,y,z的值.③求x+y/x+z的值.