来自刘飞雷的问题
7.{4x+3y-2z=-7①8.{5x-3y+6z=-3①{5x-6y+z=1②{3x-y+3z=0②{2x+z=-2③{y+3z=6③x=-1,y=-1,z=0x=-3,y=0,z=2
7.{4x+3y-2z=-7①8.{5x-3y+6z=-3①
{5x-6y+z=1②{3x-y+3z=0②
{2x+z=-2③{y+3z=6③
x=-1,y=-1,z=0x=-3,y=0,z=2


7.{4x+3y-2z=-7①8.{5x-3y+6z=-3①{5x-6y+z=1②{3x-y+3z=0②{2x+z=-2③{y+3z=6③x=-1,y=-1,z=0x=-3,y=0,z=2
7.{4x+3y-2z=-7①8.{5x-3y+6z=-3①
{5x-6y+z=1②{3x-y+3z=0②
{2x+z=-2③{y+3z=6③
x=-1,y=-1,z=0x=-3,y=0,z=2
4x+3y-2z=-7(1)
5x-6y+z=1(2)
2x+z=-2(3)
(1)×2+(2)
13x-3z=-13(4)
(3)×3+(4)
19x=-19
x=-1
z=-2-2x=0
y=(-7-4x+2z)/3=-1
5x-3y+6z=-3(1)
3x-y+3z=0(2)
y+3z=6(3)
(2)+(3)
3x+6z=6
x+2z=2(4)
(2)×3-(1)
4x+3z=3(5)
(4)×4-(5)
8z-3z=8-3
5z=5
z=1
x=2-2z=0
y=6-3z=3
答案错了