418. Вычислите: a) 7⁹·7⁵/7¹²; б) 3¹⁵/3⁵·3⁶; в) 5¹⁶·5⁴/5¹⁸; г) 0,6¹²/0,6⁴·0,6⁵.

a) 7⁹·7⁵/7¹² = 7^(9+5)/7¹² = 7¹⁴/7¹² = 7^(14-12) = 7² = 49 б) 3¹⁵/3⁵·3⁶ = 3¹⁵/(3^(5+6)) = 3¹⁵/3¹¹ = 3^(15-11) = 3⁴ = 81 в) 5¹⁶·5⁴/5¹⁸ = (5^(16+4))/5¹⁸ = 5²⁰/5¹⁸ = 5^(20-18) = 5² = 25 г) 0,6¹²/0,6⁴·0,6⁵ = 0,6¹²/(0,6^(4+5)) = 0,6¹²/0,6⁹ = 0,6^(12-9) = 0,6³ = 0,216