2x-y+3z=3 {3X+Y-2Z=-1 X+Y+Z=5
问题描述:
2x-y+3z=3 {3X+Y-2Z=-1 X+Y+Z=5
答
2x-y+3z=3(1)
3x+y-2z=-1(2)
x+y+z=5(3)
(1)+(2)
5x+z=2(4)
(1)+(3)
3x+4z=8(5)
(4)*4-(5)
17x=0
x=0
代入(4)z=2
y=3
解得x=0,y=3,z=2