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Вычисли:

1. \(\dfrac{2}{3}\cdot \dfrac{3}{5}=\) [ ];

2. \(5\cdot \dfrac{2}{3}\cdot =\dfrac{5}{1}\cdot \dfrac{2}{3}=\) [ ];

3. \(\dfrac{5}{6}\cdot 3=\) [ ];

4. \(\dfrac{1}{2}:\dfrac{2}{3}=\) [ ];

5. \(\dfrac{3}{8}:\dfrac{6}{7}=\) [ ];

6. \(4:\dfrac{8}{13}=\dfrac{4}{1}:\dfrac{8}{13}=\) [ ];

7. \(\dfrac{8}{13}:4=\) [ ];

8. \(\left( \dfrac{2}{3}\right) ^2=\) [ ];

9. \(\left( -\dfrac{2}{3}\right) ^2\) [ ];

10. \(\left( \dfrac{2}{3}\right) ^3=\) [ ];

11. \(\left( -\dfrac{2}{3}\right) ^3=\) [ ];

12. \(\left( -\dfrac{2}{3}\right) ^4=\) [ ].