Найдите сумму дробей к общему знаменателю. 9 8/21 + 4 11/14 8 5/9 + 7 3/4 + 12 7/12

9 8/21 + 4 11/14 = 9 16/42 + 4 33/42 = 13 49/42 = 14 7/42 = 14 1/6

8 5/9 + 7 3/4 + 12 7/12 = 8 20/36 + 7 27/36 +
+ 12 21/36 = 27 68/36 = 28 32/36 = 28 8/9

9 16\42+4 33\42=14 7\42
8 30\36+7 27\36+12 21\36=27 78\36=29 6\36= 29 1\6