Resposta :
9 1 3 9 1
2 5 6 2 5
0 -1 1 -1 1
DP= 9.5.1 + 1.6.(-1) + 3.2.1 = 45 - 6+ 6 = 45
DS= 1.2.1 + 9.6.(-1) + 3.5.0 = 2 - 54 + 0 = - 52
Det(A) = DP - DS
Det(A) = 45 - (-52)
Det(A) = 97
2 5 6 2 5
0 -1 1 -1 1
DP= 9.5.1 + 1.6.(-1) + 3.2.1 = 45 - 6+ 6 = 45
DS= 1.2.1 + 9.6.(-1) + 3.5.0 = 2 - 54 + 0 = - 52
Det(A) = DP - DS
Det(A) = 45 - (-52)
Det(A) = 97