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1. \(\dfrac{7}{14}=\) [ ];

2. \(\dfrac{-7}{14}=\) [ ];

3. \(\dfrac{7}{-14}=\) [ ];

4. \(\dfrac{-7}{-14}=\) [ ];

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

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

7. \(\dfrac{5a}{a}=\) [ ];

8. \(\dfrac{a}{-3a}=\) [ ];

9. \(\dfrac{a^2b^3}{a^4b^2}=\) [ ];

10. \(\dfrac{ab^3}{a^2b}=\) [ ];
    

11. \(\dfrac{a(a+b)}{a^3(a+b)}=\) [ ];
    

12. \(\dfrac{a^2(a-b)}{a(a-b)}=\) [ ];
    

13. \(\dfrac{15ab^3}{3a^2b^3}=\) [ ];

14. \(\dfrac{24a^3(a+b)}{16b(a+b)}=\) [ ];

15. \(\dfrac{18a(a-b)^2}{27(a-b)^3}=\) [ ];

16. \(\dfrac{3a(a-b)}{6a(b-a)}=\) [ ];

17. \(\dfrac{3a(a-b)}{6a(b-a)^2}=\) [ ];

18. \(\dfrac{3a(a-b)}{6a(b-a)^3}=\) [ ];

19. \(\dfrac{(a-b)^2}{(b-a)^3}=\) [ ];

20. \(\dfrac{(a-b)^2}{(b-a)^4}=\) [ ].