Упрости дробь и заполни пропуски

1. \(\dfrac{\dfrac{1}{8}}{1-\dfrac{3}{8}}=\) \(\dfrac{1}{8}:\) [ ] \(=\dfrac{1}{8}~\) \(\mathrlap{\:\cdot}\) [ ][ ].
2. \(\dfrac{a-\dfrac{1}{a}}{\dfrac{1}{a}+1}=\) [ ] \(\mathrlap{\::}\) [ ] \(\mathrlap{\:=}\) [ ][ ].
3. \( \dfrac{\dfrac{1}{x}+\dfrac{1}{y}}{\dfrac{1}{xy}}=\) [ ].