Число \(((7\sqrt7)^{-\frac{1}{3}}+(6^{\frac{1}{10}})^{-5})\cdot(\frac{1}{\sqrt7}-\sqrt{\frac{1}{6}})\) равно \(-\frac{1}{42}\) \(\frac{1}{42}\) \(\frac{1}{21}\) \(-\frac{1}{21}\) \(\frac{3}{42}\)

Задание

Число \(((7\sqrt7)^{-\frac{1}{3}}+(6^{\frac{1}{10}})^{-5})\cdot(\frac{1}{\sqrt7}-\sqrt{\frac{1}{6}})\) равно

\(-\frac{1}{42}\)
\(\frac{1}{42}\)
\(\frac{1}{21}\)
\(-\frac{1}{21}\)
\(\frac{3}{42}\)