Question

线性代数题,求行列式,1 -2 0 1 -2 0

Answer 1

1 -2 0 1 -2 0

3 -1 2 0 5 2 D1 = (5*4-2*5) = 10

2 1 4 0 5 4

1 -2 0

0 5 2 D2 = 5*4-2*5 = 10

0 5 4

5 2

5 4 D3 = 20-10 = 10

这三个行列式的值都等于：10. 答案：-10 是错的.