Resposta:
a) 6 b) 57
Explicação passo a passo:
A)
| 1 -2 3 | 1 -2 |
| 2 1 0 | 2 1 |
| 3 0 3 | 3 0 |
det(a) = (1*1*3) + (-2*0*3) + (3*2*0) - (-2*2*3) - (1*0*0) - (3*1*3)
det(a) = 3 + 0 + 0 - (-12) - 0 - 9
det(a) = 3 + 12 - 9
det(a) = 6
B)
| 3 2 -1 | 3 2 |
| 5 0 4 | 5 0 |
| 2 -3 1 | 2 -3 |
det(b) = (3*0*1) + (2*4*2) + (-1*5*-3) - (2*5*1) - (3*4*-3) - (-1*0*2)
det(b) = 0 + 16 + 15 - 10 - (-36) - 0
det(b) = 31 - 10 + 36
det(b) = 57
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Resposta:
a) 6 b) 57
Explicação passo a passo:
A)
| 1 -2 3 | 1 -2 |
| 2 1 0 | 2 1 |
| 3 0 3 | 3 0 |
det(a) = (1*1*3) + (-2*0*3) + (3*2*0) - (-2*2*3) - (1*0*0) - (3*1*3)
det(a) = 3 + 0 + 0 - (-12) - 0 - 9
det(a) = 3 + 12 - 9
det(a) = 6
B)
| 3 2 -1 | 3 2 |
| 5 0 4 | 5 0 |
| 2 -3 1 | 2 -3 |
det(b) = (3*0*1) + (2*4*2) + (-1*5*-3) - (2*5*1) - (3*4*-3) - (-1*0*2)
det(b) = 0 + 16 + 15 - 10 - (-36) - 0
det(b) = 31 - 10 + 36
det(b) = 57