Question

Если 2/a=b-(1/c), то a = ?

Answer 1

Ответ на фото .............

Answer 2

$a*(b-\frac{1}{c})=2 \\ \\ a= \frac{2}{b-\frac{1}{c}}$
$a=\frac{2}{\frac{bc-1}{c}} \\ \\ a=\frac{2c}{bc-1}$