Տնային աշխատանք 13, 24

5 + 3 = 8

3 + 3 = 6

1 + 3 = 4

0 + 3 = 3

-1 + 3 = 2

-3 + 3 = 0

a * a = S

a * b = S

(a * b) + (d * c) = S

(a * d) + (b * c) = S

(c * d) — (a * b) = S

a * (b + d) – d * c = S