1) 2¹⁸ : (2⁷)² = 2¹⁸ : 2¹⁴ = 2^(18-14) = 2⁴ = 16
2) (7⁸)² : (7³)⁵ = 7¹⁶ : 7¹⁵ = 7^(16-15) = 7¹ = 7
3) 11⁵ - (11³ )⁷ : 11²⁶ = 11⁵ - 11²¹ : 11²⁶ = 11⁵ - 11^(21-26) = 11⁵ - 11^(-5) = 11⁵ - 1/11⁵ = 11⁵ - 1/(11*11*11*11*11) = 11⁵ - 1/161051
Ответ: 1) 16; 2) 7; 3) 11⁵ - 1/161051