Вычислите 3/7 +5/14 6 15/11+ 2 9/14 8/9-7/12 8-5 4/9

3/7 + 5/14 = 6/14 + 5/14 = 11/14,

6 15/11 + 2 9/14 = (6 + 2) + (15/11 + 9/14) = 8 + (210/154 + 99/154) =
= 8 + 309/154 = 8 + 2 1/154 = 10 1/154,

8/9 - 7/12 = 32/36 - 21/36 = 11/36,

8 - 5 4/9 = 2 5/9