а) 5⁶ : 5⁴ = 5^(6-4) = 5² = 25;
б) 10¹⁵ : 10¹² = 10^(15-12) = 10³ = 1000;
в) 0,5¹⁰ : 0,5⁷ = 0,5^(10-7) = 0,5³ = 0,125;
г) (1/3)⁸ : (1/3)⁶ = (1/3)^(8-6) = (1/3)² = 1/9;
д) 2,73¹³ : 2,73¹² = 2,73^(13-12) = 2,73¹ = 2,73;
е) (-2/3)⁷ : (-2/3)⁴ = (-2/3)^(7-4) = (-2/3)³ = -8/27;
Ответ: а) 25; б) 1000; в) 0,125; г) 1/9; д) 2,73; е) -8/27