Question

с тем как это было сделано и достигнуто ​

Answer 1

Пошаговое объяснение:

1) 5/7 + 5/9 + 2/7 + 4/9 = (5/7 + 2/7) + (5/9 + 4/9) = 7/7 + 9/9 = 1 + 1 = 2

2) 2/17 + 8/9 + 15/17 + 5/9 = (2/17 + 15/17) + (8/9 + 5/9) = 17/17 + 13/9 = 1 + 1 4/9 = 2 4/9

3) 3 2/7 + 4 5/9 + 2 4/5 + 2 5/7 = (3 2/7 + 2 5/7) + (4 5/9 + 2 4/5) = 5 7/7 + (4 25/45 + 2 36/45) = 6 + 6 61/45 = 6 + 7 16/45 = 13 16/45