Ответ:

Пошаговое объяснение:

1.

4. 4/7 - 3/7 * (5/14 + 17/21) = 4. 1/14

1) 5/14 + 17/21 = 15/42 + 34/42 = 49/42 = 7/6

2) 3/7 * 7/6 = 3/6 = 1/2

3) 4. 4/7 - 1/2 = 4. 8/14 - 7/14 = 4. 1/14

2.

4. 5/7 - 2. 2/5 * 1. 19/36 - (5/12 + 13/20) * 9/16 = 47/105

1) 2. 2/5 * 1. 19/36 = 12/5 * 55/36 = 1/1 * 11/3 = 11/3 =

3. 2/3

2) 5/12 + 13/20 = 25/60 + 39/60 = 64/60 = 16/15

3) 16/15 * 9/16 = 9/15 = 3/5

4) 4. 5/7 - 3. 2/3 = 4. 15/21 - 3. 14/21 = 1. 1/21

5) 1. 1/21 - 3/5 = 1. 5/105 - 63/105 = 110/105 - 63/105 = 47/105

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