Question

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Answer 1

Ответ:

$\frac{28}{67} \times (a - 2 \frac{11}{13} \times b) \times c = \frac{28}{67} ac - \frac{1036}{871} bc$

a=10 11/13

b=2

c=2/7

$\frac{28}{67} \times 10\frac{11}{13} \times \frac{2}{7} - \frac{1036}{871} \times 2 \times \frac{2}{7} = \frac{4}{67} \times \frac{141}{13} \times 2 - \frac{148}{871} \times 2 \times 2 = \frac{1128}{871} - \frac{592}{871} = \frac{536}{871} = \frac{8}{13}$

Answer 2

Ответ:

Пошаговое объяснение:

28/67 * (10. 11/13 - 2. 11/13 * 2) * 2/7 = 8/13

1) 2. 11/13 * 2 = 37/13 * 2 = 74/13 = 5. 9/13

2) 10. 11/13 - 5. 9/13 = 5. 2/13

3) 28/67 * 5. 2/13 = 28/67 * 67/13 = 28/13

4) 28/13 * 2/7 = 4/13 * 2/1 = 8/13

Ответ: 8/13