Question

问一个行列式。各位帮我解下

1 2 -1
3 4 -2
5 -4 1

Answer 1

c1+c3, r2+2c3
0 0 -1
1 0 -2
6 -2 1
=
-1 0 0
-2 1 0
1 6 -2
=
2

满意请采纳^_^

Answer 2

1 2 -1 1 2 -1
3 4 -2= 0 -2 1= -2*6-(-14)=2
5 -4 1 0 -14 6

Answer 3

貌似是-6吧