Упростите выражения : 

 

1. [tex]\frac{49b}{a} - \frac{81a}{b} * \frac{1}{7a + 9b}[/tex] 

 

2. [tex](\frac{a}{b}+ \frac{81b}{a} + 18) * \frac{1}{a + 9b}[/tex]

 

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