0,3⁷*0,3⁻¹⁰=0,3⁷⁻¹⁰=0,3⁻³=(10/3)³=1000/27=37  1/3
17⁻⁵*17³*17=17⁻⁵⁺³⁺¹=17⁻¹=1/17

(2/13)⁻¹²:(2/13)²=(2/13)⁻¹²⁻²=(2/13)⁻¹⁴=(13/2)¹⁴
(2/5)³:(2/5)⁻¹=(2/5)³⁻⁽⁻¹⁾=(2/5)⁴=16/625