⁴√ 15 5/8 = ⁴√125/8 = (( 5/2 )³ ) ^ 1/4 = 5/2 ^ 3/4 ⁴√ 2/5 = 2/5 ^ 1/4 = 5/2 ^ - 1/4 ( 5/2 ^ 3/4 ) : ( 5/2 ^ - 1/4 ) = 5/2 ^ 4/4 = 5/2 = 2,5 Ответ 2,5