446 Вправа 446Алгебра 8 клас Бевз 2025 · § 9 · стор. 90

446. Знайди значення виразу.

а) ${\displaystyle 8\cdot 16^{-1}=}$${\displaystyle \frac{8}{16}=}$${\displaystyle 0,5}$;

б) ${\displaystyle -3^{-3}\cdot 54=}$${\displaystyle -\frac{54}{27}=}$${\displaystyle -2}$;

в) ${\displaystyle {(-5)}^{-3}:{\left(\frac{1}{5}\right)}^2=}$${\displaystyle -\frac{1}{125}:\frac{1}{25}=}$${\displaystyle -\frac{25}{125}=}$${\displaystyle -0,2}$;

г) ${\displaystyle 0,8:{(-0,5)}^{-3}=}$${\displaystyle 0,8:{(-2)}^3}$=

=${\displaystyle 0,8:(-8)=}$${\displaystyle -0,1}$;

ґ) ${\displaystyle 100:{\left(\frac{2}{5}\right)}^{-2}=}$${\displaystyle 100:\frac{25}{4}=}$${\displaystyle 100\cdot \frac{4}{25}=}$${\displaystyle 16}$;

д) ${\displaystyle {(-1\frac{1}{9})}^{-3}:0,81=}$${\displaystyle {(-\frac{9}{10})}^3:0,81}$=

=${\displaystyle -0,729:0,81=}$${\displaystyle -0,9}$.