Объяснение:

№1

1) 2 1/3 * 9 = 7/3 * 9 = 7/1 * 3 = 21/1 = 21

2) 1 1/3 * 3 1/4 = 4/3 * 13/4 = 1/3 * 13/1 = 13/3 = 4 1/3

3) 2 2/7 * 3 5/24 = 16/7 * 77/24 = 2/1 * 11/3 = 22/3 = 7 1/3

4) 21 - 4 1/3 = 20 3/3 - 4 1/3 = 16 2/3

5) 16 2/3 - 7 1/3 = 9 1/3

№2

1) 9 1/6 * 4/15 = 55/6 * 4/15 = 11/3 * 2/3 = 22/9 = 2 4/9

2) 2 4/9 + 2 5/9 = 4 9/9 = 5

3) 5 * 2/5 = 10/5 = 2

4) 1 7/48 * 2 2/5 = 55/48 * 12/5 = 11/4 * 1/1 = 11/4 = 2 3/4

5) 2 3/4 - 2 = 3/4

№3

1) 2 1/4 + 4 5/6 = 2 3/12 + 4 10/12 = 6 13/12 = 7 1/12

2) 7 1/12 : 3 2/5 = 85/12 : 17/5 = 85/12 * 5/17 = 5/12 * 5/1 = 25/12 = 2 1/12

3) 3/4 : 3/5 = 3/4 * 5/3 = 5/4 = 1 1/4

4) 2 1/12 - 1 1/4 = 2 1/12 - 1 3/12 = 1 13/12 - 1 3/12 = 10/12 = 5/6

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