Ответ:

Пошаговое объяснение:

65)

(1)

1) 8 1/3 * 9 = 25/3 * 9 = 75

2) 2 2/3 * 3 1/4 = 8/3 * 13/4 = 26/3

3) 4 4/7 * 3 5/24 = 32/7 * 77/24 = 44/3

4) 26/3 + 44/3 = 70/3 = 23 1/3

5) 75 - 23 1/3 = 51 2/3

ответ: 51 2/3

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(2)

1)9 1/6 * 4/15 = 55/6 * 4/15 = 22/9

2) 2 5/9 + 22/9 = 23/9 + 22/9 = 45/9 = 5

3) 5 * 1/4 = 5/4

4) 1 1/48 * 2 2/5 = 49/48 * 12/5 = 49/20

5) 49/20 - 5/4 = 49/20 - 25/20 = 24/20 = 1 1/5

ответ: 1 1/5

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66)

(1) = 2 4/7 * (4 2/9 + 1 2/9) = 2 4/7 * 5 4/9 = 18/7 * 49/9 = 14

ответ: 14

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(2) = 6 2/3 * (2 5/6 + 3/10 - 1 1/3) = 6 2/3 * (2 25/30 + 9/30 - 1 10/30) = 6 2/3 * 1 24/30 = 20/3 * 9/5 = 12

ответ: 12

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