Resposta :
Resposta:
a) [x. y]
[x+y. x+y]
x.x+y - y.x+y = x^2+y - yx+y = x^2+y+y-yx = x^2+2 y-yx
b) [3 2 1]
[5 5 0]
[2 -3 1]
[3 2 1] 3 2]
[5 5 0] 5 5]
[2 - 3 1] 2 -3]
3.5.1 + 2.0.2 + 1.5.-3 - 2.5.1 - 3.0.-3 - 1.5.2
15 + 0 -15 - 10 + 0 - 10
15 - 15 - 10 - 10
0 - 10 - 10
-10 - 10
-20