Question

2 exercícios sobre matrizes, me ajudem!

Answer 1

a11=-2.1+1=-1
a21=-2.2+1=-3
a22=-2.2+2=-2
a12=-1-2=-3
a13=-1-3=-4
a23=-2-3=-5

3) Somando a diagonal principal de A=1+3=4
Somando a diagonal principal de B=2+3-1=4