Resposta :
1 2 1 1 2
D = -2 8 1 -2 8
2 3 1 2 3
D= 1.8.1+ 2.1.2 + 1.(-2).3 -[ 2.(-2)1+1.1.3 + 1.8.2]= 8+4-6 - [-4+3+16]
D= 6 -15 = 9
A = 1 . D
2
A = 1. 9 ==> A = 9
2 2
D = -2 8 1 -2 8
2 3 1 2 3
D= 1.8.1+ 2.1.2 + 1.(-2).3 -[ 2.(-2)1+1.1.3 + 1.8.2]= 8+4-6 - [-4+3+16]
D= 6 -15 = 9
A = 1 . D
2
A = 1. 9 ==> A = 9
2 2