用初等变换求矩阵A=
(11-1
210
1-10)
的逆A-1.
【正确答案】:(A,E)=
(1 1 -1 1 0 0
2 1 0 0 1 0
1 -1 0 0 0 1)
→
(1 1 -1 1 0 0
0 -1 2 -2 1 0
0 -2 1 -1 0 1)
→
(1 1 -1 1 0 0
0 -1 2 -2 1 0
0 0 -3 3 -2 1)
→
1 1 -1 1 0 0
0 1 -2 2 -1 0
0 0 1 -1 2/3 -1/3)
→
(1 0 0 0 1/3 1/3
0 1 0 0 1/3 -2/3
0 0 1 -1 2/3 -1/3)
所以
A-1=
(0 1/3 1/3
0 1/3 -2/3
-1 2/3 -1/3)
用初等变换求矩阵A= (11-1 210 1-10) 的逆A-1.
- 2024-11-07 03:12:29
- 线性代数(工)(13175)