Question

${81}^{2} ab +35 {ab}^{2} + 9a \div (9ab)$

Answer 1

${81}^{2} ab + 35a{b}^{2} + \frac{9a}{9ab} = \\ = 6561ab + 35a{b}^{2} +\frac{1}{b} = \\ = 6561ab+ 35a{b}^{2}+ \frac{1}{b}$