大学线性代数,我写了一个步骤,我怎么也算不出正确答案,不知道是算错了,还是步骤错了

2025-04-29 18:22:19
推荐回答(1个)
回答1:

=
1 2 1 1
2 4 -1 1
200 200 100 100
1 2 -1 -2
=100
1 2 1 1
2 4 -1 1
2 2 1 1
1 2 -1 -2
=100
1 2 1 1
0 0 -3 -1
0 -2 -1 -1
0 0 -2 -3
=-100
1 2 1 1
0 -2 -1 -1
0 0 -3 -1
0 0 -2 -3
=-100
1 2 1 1
0 -2 -1 -1
0 0 -3 -1
0 0 0 -7/3
=-100X(-2)X(-3)X(-7/3)
=1400