Răspuns:
(27¹⁰ + 2 × 9¹⁵) : 81⁷ =
= (3³⁰ + 2 × 9¹⁵) : 81⁷
= (3³⁰ + 2 × 3³⁰) : 81⁷
= (3³⁰ + 2 × 3³⁰) : 3²⁸
= (3 × 3³⁰) : 3²⁸
= 3³¹ : 3²⁸
= 3³
= 27
