zad.13(a + b + c + d + e) : 5(7 + 9 + 11 + 13 + 15) : 5 = 55 : 5 = 11zad.14a) Ob = a + b + cOb = 7 + 9 + 10 = 26b) Ob = p + p + 3 + r + r + 2Ob = 7 + 10 + 11 + 13 = 41c) Ob = k + s + t + 2 x (t +1)Ob = 6 + 5,5 + 5 + 2 x (5 + 1) = 28,5