№1
a)2^-3 * 2/3 = 1/8 * 2/3 = 1/12
б)(-4)^-2 = 1/16
в)25 - (1/7)^-2 = 25 - 49 = -24
№2
а)2^-4 * 8^2 = 2^-4 * 2^6 = 2^2 = 4
б)9^-2 / 3^-5 = 3^-4 / 3^-5 = 3
№3
а)6a^-8 = 6/a^8
б)3(xy)^-1 = 3/xy
№4
(5x^-2 / 6y^-1)^-3 * 125x^-6 y^5 = 5^-3 x^6 / 6y^3 * 125 x^-6 y^5 = y^5 / 6y^3 =
1/6 y^2
B1
27^-1 * 9^5
________ = (3^-3 * 3^10) / (3^0 * 3^-3) = 3^7 / 3^-3 = 3^10
81^0 * 3^-3