281° Вправа 281Алгебра 8 клас Тарасенкова 2025 · § 8 · стор. 84

281. Подайте степінь як дріб:

${\displaystyle a^{-n}=}$${\displaystyle \frac{1}{a^n}}$.

1) ${\displaystyle 4^{-4}=}$${\displaystyle \frac{1}{4^4}=}$${\displaystyle \frac{1}{256}}$;

2) ${\displaystyle 7^{-3}=}$${\displaystyle \frac{1}{7^3}=}$${\displaystyle \frac{1}{343}}$;

3) ${\displaystyle 2^{-5}=}$${\displaystyle \frac{1}{2^5}=}$${\displaystyle \frac{1}{32}}$;

4) ${\displaystyle 5^{-7}=}$${\displaystyle \frac{1}{5^7}}$;

5) ${\displaystyle {10}^{-9}=}$${\displaystyle \frac{1}{{10}^9}}$;

6) ${\displaystyle {11}^{-3}=}$${\displaystyle \frac{1}{{11}^3}}$;

7) ${\displaystyle {21}^{-5}=}$${\displaystyle \frac{1}{{21}^5}}$;

8) ${\displaystyle {45}^{-7}=}$${\displaystyle \frac{1}{{45}^7}}$;

9) ${\displaystyle {54}^{-9}=}$${\displaystyle \frac{1}{{54}^9}}$;

10) ${\displaystyle {80}^{-13}=}$${\displaystyle \frac{1}{{80}^{13}}}$;

11) ${\displaystyle {90}^{-20}=}$${\displaystyle \frac{1}{{90}^{20}}}$;

12) ${\displaystyle {100}^{-10}=}$${\displaystyle \frac{1}{{100}^{10}}}$.