Question

Срочно!!!
20 баллов !!!
Заранее сасибки))

Answer 1

$\displaystyle -\frac{7}{15}(-\frac{13}{14})-\frac{16}{60}(-\frac{17}{8})=d\\\\ \frac{1}{15}*\frac{13}{2}+\frac{2}{60}*17=d\\\\ \frac{13}{30}+\frac{1}{30}*17=d\\\\ \frac{13}{30}+\frac{17}{30}=d\\\\ 1=d\\d=1$