Выполнить действия: a) 4 3/7 : 1 1/7 - 2 2/14 * 7; б) (4 - 14/33 1 1/21) * 5 5/8.

a) Преобразуем: 4 3/7 = 31/7, 1 1/7 = 8/7, 2 2/14 = 32/14 = 16/7. Тогда: (31/7)/(8/7) - (16/7)*7 = (31/7)*(7/8) - 16 = 31/8 - 16 = -97/8. б) Преобразуем: 4 = 132/33, 14/33 = 14/33, 1 1/21 = 22/21, 5 5/8 = 45/8. Тогда: ((132/33 - 14/33 - 22/21)*(45/8)) = ((118/33 - 22/21)*(45/8)) = ((118*21 - 22*33)/(33*21))*(45/8) = ...