Повторюємо алгебру за 8 клас: 11

11. Обчисліть:

1) 9^–2 = $\frac{1}{9^2}$ = $\frac{1}{81}$;

2) (–4)^–3 = $\frac{1}{{(-4)}^3}$ = –$\frac{1}{64}$;

3) (–1)^–7 = $\frac{1}{{(-1)}^7}$ = –1;

4) 14^–1 = $\frac{1}{{14}^1}$ = $\frac{1}{14}$;

5) 2⁹ • 2^–10 = 2^9–10 = 2^–1 = $\frac{1}{2^1}$ = $\frac{1}{2}$;

6) 5 : 5^–1 = 5^1–(–1) = 5² = 25;

7) $\frac{4^{-3}}{4^{-2}}$ = $\frac{4^2}{4^3}$ = $\frac{1}{4}$;

8) (($\frac{1}{3}$)^–1)–2 = ($\frac{1}{3}$)² = $\frac{1}{9}$.