ПОВТОРЮЄМО АЛГЕБРУ ЗА 8 КЛАС: 12

12. Обчисліть:

1) 2^–3 = $\frac{1}{2^3}$ = $\frac{1}{8}$;

2) (–5)^–2 = $\frac{1}{(-2{)}^2}$ = $\frac{1}{25}$;

3) (–1)^–11 = $\frac{1}{{(-1)}^{11}}$ = –1;

4) 15^–1 = $\frac{1}{{15}^1}$ = $\frac{1}{15}$;

5) 4⁸ • 4^–10 = 4^8–10 = 4^–2 = $\frac{1}{4^2}$ = $\frac{1}{16}$;

6) 7^–1 : 7 = 7^–1–1 = 7^–2 = $\frac{1}{7^2}$ = $\frac{1}{49}$.

7) $\frac{9^{-4}}{9^{-5}}$ = $\frac{9^5}{9^4}$ = 9;

8) (($\frac{1}{10}$)^–3)–1 = ($\frac{1}{10}$)³ = $\frac{1}{1000}$.