Предмет: Математика, автор: bel2006bel

3-х/7=-5х/4 решите уравнение

Ответы

Автор ответа: Alekseyshka2k17

0

домножить на 28. получить 12-4x=-35x откуда x=12/31

51742554: 3 × 28 = 84, а не 12

Автор ответа: 51742554

1

$\frac{3}{1} - \frac{x}{7} = \frac{ - 5x}{4}$

Наименьшее общее кратное - 28

$\frac{84}{28} - \frac{4x}{28} = \frac{ - 35x}{28}$

Умножаем левую и правую часть на 28

$84 - 4x + 35x = 0 \\ 31x = - 84 \\ x = - 84 \div 31 \\ x = - 2 \frac{22}{31}$

Ответ: $- 2 \frac{22}{31}$

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