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Приведи к общему знаменателю дроби:

1. \(\cfrac{3}{8a^{2}b^{4}}\) и \(\cfrac{5}{12a^{3}b^{2}}\) ;

2. \(\cfrac{m}{n-6}\) и \(\cfrac{p}{n^{2}-36}\) ;

3. \(\cfrac{a+2}{a^{2}-ab}\) и \(\cfrac{b-3}{ab-b^{2}}\) ;

4. \(\cfrac{2c+3}{c^{2}+6c+9}\) и \(\cfrac{c-1}{c^{2}-9}\) .