1) Вычислите: 13/14 + 5/9 * 14/27.

13/14 + 5/9 * 14/27 = 13/14 + (5 * 14) / (9 * 27) = 13/14 + 70/243

To add these fractions, find a common denominator. The least common multiple of 14 and 243 is 3402.

(13 * 243) / (14 * 243) + (70 * 14) / (243 * 14) = 3159/3402 + 980/3402 = 4139/3402