18*3⁻¹¹+( 5/3) * 3⁻¹⁰ + (4/9)* 3⁻⁹=(2*9)*3⁻¹¹+( 5/3) * 3⁻¹⁰ + (4/9)* 3⁻⁹=(2*3²)*3⁻¹¹+( 5/3) * 3⁻¹⁰ + (4/9)* 3⁻⁹=2*3⁻⁹+( 5/3) * 3⁻¹⁰ + (4/9)* 3⁻⁹=3⁻⁹(2+(5/3)*3⁻¹+(4/9))=3⁻⁹((18/9)+(5/3)*(1/3)+(4/9))= 3⁻⁹((18/9)+(5/9)+(4/9))=3⁻⁹(27/9)=3⁻⁹*3=3⁻⁹⁺¹=3⁻⁸
:)