Question

решите уравнение
у-1/-2,5=6/0,7

Answer 1

Ответ: -20целых3/7

$\frac{y - 1}{ - 2.5} = \frac{6}{0.7} \\ 0.7y - 0.7 = - 15 \\ 0.7y = - 14.3 \\ y = - 14.3 \div 0.7 = - 14 \frac{3}{10} \div \frac{7}{10} = \\ - \frac{143}{10} \div \frac{7}{10} = - \frac{143}{10} \times \frac{10}{7} = - 20 \frac{3}{7}$