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Ответ:

Пошаговое объяснение:

1. [tex]\frac{4}{a} + \frac{7}{b} = \frac{4b+7a}{ab}[/tex]

2. [tex]\frac{9}{m} - \frac{5}{mn} = \frac{9n-5}{mn}[/tex]

3.[tex]\frac{4}{12xy} - \frac{11}{18xy} = \frac{1}{3xy} - \frac{11}{18xy} =- \frac{5}{18xy}[/tex]

4. +[tex]\frac{5m}{3ab} + \frac{2n}{5a^{2}b } - \frac{7p}{2ab^{2} } = \frac{50abm+12bn-105ap}{30a^{2} b^{2} }[/tex]