436 Вправа 436Алгебра 8 клас Бевз 2025 · § 9 · стор. 89

436. Обчисли.

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

б) ${\displaystyle 3^{-2}=}$${\displaystyle \frac{1}{3^2}=}$${\displaystyle \frac{1}{9}}$;

в) ${\displaystyle {(-2)}^{-3}=}$${\displaystyle \frac{1}{{(-2)}^3}=}$${\displaystyle -\frac{1}{8}}$;

г) ${\displaystyle {\left(\frac{1}{6}\right)}^{-1}=}$${\displaystyle 6}$;

ґ) ${\displaystyle {\left(1\frac{1}{2}\right)}^{-2}=}$${\displaystyle {\left(\frac{3}{2}\right)}^{-2}=}$${\displaystyle {\left(\frac{2}{3}\right)}^2=}$${\displaystyle \frac{4}{9}}$.