d) [ ( - 1 / 3 )⁵ : ( - 1 / 3 )² ] ² : [ ( - 1 / 3 )² ] ²= 1 / 9
= [ ( - 1 / 3 ) ⁵ ⁻ ² ] ² : ( 1 / 3 ) ⁴ =
= ( - 1 / 3 )⁶ : ( 1 / 3 )⁴ =
= ( 1 / 3 ) ⁽ ⁶ ⁻ ⁴ ⁾ =
= ( 1 / 3 )² =
= 1 / 3² =
= 1 / 9
