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Пошаговое объяснение:

№2

1) 5/24 + 5/16 = 10/48 + 15/48 = 25/48

2) 1 2/3 - 3/5 = 1 10/15 - 9/15 = 1 1/15

3) 25/48 * 1 1/15 = 25/48 * 16/15 = 5/3 * 1/3 = 5/9

4) 5/9 * 1 4/5 = 5/9 * 9/5 = 45/45 = 1

№3

1) 3 3/5 * 5/12 = 18/5 * 5/12 = 3/1 * 1/2 = 3/2 = 1 1/2

2) 4 3/10 - 1 1/2 = 4 3/10 - 1 5/10 = 3 13/10 - 1 5/10 = 2 8/10 = 2 4/5

3) 2 4/5 * 5/6 = 14/5 * 5/6 = 7/1 * 1/3 = 7/3 = 2 1/3