2,5^1,5+(0,25)^-0,5-81^0,75=(2,5)³/²+((1/2)²)⁻¹/₂-(3⁴)³/⁴=√12,5+2-27≈
≈3,54-25≈-21,46.
Общ. знаменатель = 104.
наименьшая разность = 1/104.
5/8-8/13=65/104-64/104=1/104.
Ответ:1/104.
( 1/64)^ ( - 4/3) =
= ( 4^( - 3))^( - 4/3) =
= 4^(4*3)/3 =
= 4^4 = 256