a) (11⁻⁴)⁶•(11⁻²)⁻¹² = 11⁻²⁴ • 11²⁴ = 11⁻²⁴⁺²⁴ = 11⁰ = 1
б) ($$\frac{1}{9}$$)⁻⁴•$$\frac{1}{9}$$ = ($$\frac{1}{9}$$)⁻⁴•$$\frac{1}{9}$$¹ = ($$\frac{1}{9}$$)⁻⁴⁺¹ = ($$\frac{1}{9}$$)⁻³ = 9³ = 729
в) (0,2)⁻⁵•0,2⁸ = (0,2)⁻⁵⁺⁸ = (0,2)³ = 0,008
г) ((-30)⁵)⁻¹¹:((-30)⁸)⁻⁷+5⁻¹ = (-30)⁻⁵⁵ : (-30)⁻⁵⁶ +$$\frac{1}{5}$$ = (-30)⁻⁵⁵⁻⁽⁻⁵⁶⁾ +$$\frac{1}{5}$$ = (-30)¹ +$$\frac{1}{5}$$ = -30 + 0,2 = -29,8
д) $$\frac{15^{4} \cdot 5^{-8}}{45^{-2} \cdot 3^{7}} = \frac{(3 \cdot 5)^{4} \cdot 5^{-8}}{(3^{2} \cdot 5)^{-2} \cdot 3^{7}} = \frac{3^{4} \cdot 5^{4} \cdot 5^{-8}}{3^{-4} \cdot 5^{-2} \cdot 3^{7}} = \frac{3^{4} \cdot 5^{-4}}{3^{3} \cdot 5^{-2}} = 3 \cdot 5^{-2} = \frac{3}{25} = 0,12$$