解方程组：I.x+2y-z=6 2x+y+z=9 3x+4y+z=18 II.x-y=3 x²-y²=18

解方程组：{2x+y+z=2 x+2y+z=4 x+y+2z=6 解方程组x+y+z=6 x+2y-3z=4 2x-y+z=5 x+y+z+2,4x+2y+z+2,9x+3y+z=6解方程组 解方程组{3x+y-z=4,2x-y+3z=12,x+y+z=6} 解方程组2x+3y-z=12,3x-y+z=4,x+y+z=6 3x-y+z=3,2x+3y-z=12,x+y+z=6解方程组 解方程组：x+y+z=4,x+y+2z=5,3x+y-z=6 方程组：{x+y-z=6,x+z=16,x-y+2z=17 解方程组2x=3y=6z,x+2y+z=16 解方程组{6x=4y=3z,2x+y+z=22 解三元一次方程组：x+y+z=6,y-z=4,x-y-2z=3, 已知x、y、z满足方程组：x+y-z=6；y+z-x=2；z+x-y=0 求x、y、z的值 已知X.Y.Z满足方程组,X+y-Z=6y+z-x=2z+x-y=0求X.Y.Z的值 解方程组：I.x+2y-z=6 2x+y+z=9 3x+4y+z=18 II.x-y=3 x²-y²=18 {x+y+z=6,x-z=2,2x-y+z=5 解方程组 解方程组,｛x+y+3=-6,2x-y+3z=-9.3x+2y-z=-4 x+y=-2 x+z=13 y+z=1 解方程组x+y=-2x+z=13y+z=1解方程组 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