47 Вправа 47Алгебра 8 клас Бевз 2025 · § 2 · стор. 18

47. Скороти дріб.

а) ${\displaystyle \frac{8}{12}=}$${\displaystyle \frac{\cancel{4}\cdot 2}{\cancel{4}\cdot 3}=}$${\displaystyle \frac{2}{3}}$;

б) ${\displaystyle \frac{21}{105}=}$${\displaystyle \frac{\cancel{21}\cdot 1}{\cancel{21}\cdot 5}=}$${\displaystyle \frac{1}{5}}$;

в) ${\displaystyle \frac{160}{20}=}$${\displaystyle 8}$;

г) ${\displaystyle \frac{-21}{21}=}$${\displaystyle -1}$;

ґ) ${\displaystyle \frac{-6}{54}=}$${\displaystyle \frac{-\cancel{6}}{\cancel{6}\cdot 9}=}$${\displaystyle -\frac{1}{9}}$;

д) ${\displaystyle \frac{14}{-56}=}$${\displaystyle \frac{\cancel{14}}{-\cancel{14}\cdot 4}=}$${\displaystyle -\frac{1}{4}}$;

е) ${\displaystyle \frac{0,9}{0,15}=}$${\displaystyle \frac{90}{15}=}$${\displaystyle 6}$.