Упростите выражения
1. [tex]\frac{4}{a} - \frac{2a^{2} - 9b^{2} }{ab} + \frac{2a}{b}[/tex]
2.[tex]\frac{4a}{a^{2} - 4b^{2} } - \frac{4}{a + 2b}[/tex]
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