解方程组｛2x+5y+z=3 3z-2y-z=-7 4x+2y-z=-14

解方程组：x+y+z=4,x+y+2z=5,3x+y-z=6 解方程组：2x+3y+4z=20,x+y+z=7 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. 已知方程组4x-5y+2z=0 x+2y=3z 则x:y:z 解三元一次方程组：｛x+y+z=4 2x+y+3z=9 x+3y+2z=14 ｛3x+y-z=7 x+2y+2z=12 方程组3x+4y+z=14 x+5y+2z=17 2x+2y-z=3 解方程组 解三元一次方程组：x+y+z=6,y-z=4,x-y-2z=3, 解方程组x+2y-z=1 ,3x-3y+z=2,2x+3y+z=7和方程组x+y=-14,y+z=-7,x+z=19