Question

Решите уравнения
3
(4/5-x)+13/20=7/10

Answer 1

Ответ:

$( \frac{4}{5} - x) + \frac{13}{20} = \frac{7}{10} \\ \frac{4}{5} - x = \frac{7}{10} - \frac{13}{20} = \frac{14 - 13}{20} = \frac{1}{20} \\ \frac{4}{5} - x = \frac{1}{20} \\ - x = \frac{1}{20} - \frac{4}{5} = \frac{1 - 16}{20} = - \frac{15}{20} = - \frac{3}{4} \\ - x = - \frac{3}{4} \\ x = \frac{3}{4}$