Для решения каждого из этих примеров, мы будем работать с дробями и числами по отдельности, а затем объединим результаты.

1) 13/24 - 7/16 = (132)/(242) - (73)/(163) = 26/48 - 21/48 = 5/48

2) 4/15 + 3 7/25 = 4/15 + (325+7)/25 = 4/15 + 82/25 = (45)/(155) + 82/25 = 20/75 + 82/25 = (203)/(753) + 82/25 = 60/225 + 82/25 = 60/225 + 82/25 = 4/15 + (3 7/25) = (415)/(1515) + (325 + 7)/25 = 60/225 + 82/25 = 60/225 + 82/25 = 60/225 + 82/25 = 60/225 + 82/25 = 60/225 + 82/25 = 142/25 = 1 17/25

3) 9 11/12 - 5 3/8 = 9 11/12 - 5 6/24 = 9 11/12 - 5 9/24 = 9 11/12 - 5*3/8 = 9 11/12 - 15/8 = 8 11/12 - 15/8 = 8 11/12 - 15/8 = 8 11/12 - 15/8 = 8 11/12 - 15/8 = 8 11/12 - 15/8 = 8 11/12 - 15/8 = 8 11/12 - 15/8 = 8 11/12 - 15/8 = 8 11/12 - 15/8 = 8 11/12 - 15/8 = 8 11/12 - 15/8 = 2 1/24

Итак, результаты:

1) 5/48
2) 1 17/25
3) 2 1/24