2. Вычислите: 8/35 * (5/6 + 11/12).

5/6 + 11/12 = 10/12 + 11/12 = 21/12

8/35 * 21/12 = (8 * 21) / (35 * 12) = 168 / 420

168 / 420 = 2/5