Упрости выражения

1. \(x^{−1,3} \cdot x^{2,5}=\) [ ];
2. \(x^{\frac{7}{12}}: x^{\frac{5}{8}}=\) [ ];
3. \(\left(x^{−6}\right)^{0,6}=\) [ ];
4. \(\left(x^{\frac{2}{3}} y^{\frac{2}{9}}\right)^{\frac{18}{25}}=\) [ ];
5. \(\left(\sqrt[4]{a^{−3}}\right)^{\frac{4}{9}} \cdot\left(a^{\frac{8}{9}}\right)^{−\frac{3}{16}}=\) [ ].