14. Вычислите: 11/14 + 8/15 : (4 - 26/27) - 1/10

4 - 26/27 = 108/27 - 26/27 = 82/27.
8/15 : 82/27 = 8/15 * 27/82 = (8*27)/(15*82) = (4*9)/(5*41) = 36/205.
11/14 + 36/205 - 1/10 = (11*205 + 36*14 - 1*290) / 2900 = (2255 + 504 - 290) / 2900 = 2469 / 2900.
Ответ: 2469/2900