30 . выражение 15 3/8х -3,375 - 10 5/6 и найдите его значение при х =2 7/109

   15 3/8 * x - 3,375 - 10 5/6 = 15 3/8 * x - 3 3/8 - 10 5/6 =
= 369x/24 - 81/24 - 260/24 = 1/24 * (369x - 341);
При х = 2 7/109:
1/24 * (369x - 341) = 1/24 * (369*225/109 - 341) = 1/24 * (761 76/109 - 341) =
= 1/24 * 420 76/109 = 1/24 * 45856/109 = 11464/654 = 17 173/327 ≈ 17,529