Решение
1) (√13 + √7)² /(10 + √91) = (13 + 2√91 + 7)/(10 + √91) =
= (20 + 2√91)/(10 + √91) = [2*(10 + √91) / (10 + √91) = 2
2) 5*9¹/³ - 9¹/⁶ = 5*3²/³ - 3¹/³ = 5*√3*(√3-1) = 15 - 5√3
3) (49¹/³ * 49¹/³) = 7²/³ * 7¹/³ = 7
4) (√15 - √60)*√15 = 15 - 2*15 = - 15
5) (8√3)² / 8 = (64*3)*8 = 24