Question

20 ballov////////////////////////////////////////////////

Answer 1

Ответ:

$( \frac{t}{c} - \frac{c}{t} ) \times \frac{4tc}{t - c} = ( \frac{ {t}^{2} - {c}^{2} }{tc} ) \times \frac{4tc}{t - c} = \frac{(t - c)(t + c)}{tc} \times \frac{4tc}{t - c} = 4(t + c)$