Число \(((7\sqrt7)^{-\frac{1}{3}}+(3^{\frac{1}{10}})^{-5})\cdot(\frac{1}{\sqrt7}-\sqrt{\frac{1}{3}})\) равно \(-\frac{4}{21}\) \(\frac{4}{21}\) \(\frac{2}{21}\) \(-\frac{2}{21}\) \(\frac{10}{21}\)

Задание

Число \(((7\sqrt7)^{-\frac{1}{3}}+(3^{\frac{1}{10}})^{-5})\cdot(\frac{1}{\sqrt7}-\sqrt{\frac{1}{3}})\) равно

\(-\frac{4}{21}\)
\(\frac{4}{21}\)
\(\frac{2}{21}\)
\(-\frac{2}{21}\)
\(\frac{10}{21}\)