217 Вправа 217Алгебра 8 клас Бевз 2025 · § 4 · стор. 43

217. Виконай дії.

а) ${\displaystyle 2+\frac{8}{15}\cdot 1\frac{9}{16}=}$${\displaystyle 2+\frac{8}{15}\cdot \frac{25}{16}=}$${\displaystyle 2+\frac{5}{6}=}$${\displaystyle 2\frac{5}{6}}$;

б) ${\displaystyle 1\frac{5}{12}\cdot 2+4\cdot 1\frac{1}{18}+1\frac{1}{9}\cdot 1\frac{1}{4}=}$${\displaystyle \frac{17}{6}+\frac{38}{9}+\frac{25}{18}}$=

=${\displaystyle \frac{51+76+25}{18}=}$${\displaystyle \frac{152}{18}=}$${\displaystyle 8\frac{4}{9}}$;

в) ${\displaystyle 2\frac{2}{11}\cdot \frac{7}{8}-6\cdot \frac{1}{5}=}$${\displaystyle \frac{24}{11}\cdot \frac{7}{8}-\frac{6}{5}=}$${\displaystyle \frac{21}{11}-\frac{6}{5}}$=

=${\displaystyle \frac{105-66}{55}=}$${\displaystyle \frac{39}{55}}$;

г) ${\displaystyle 2\frac{1}{10}\cdot 4\frac{1}{6}+6\cdot \frac{3}{8}-\frac{9}{20}\cdot 6=}$${\displaystyle \frac{35}{4}+\frac{9}{4}-\frac{27}{10}}$=

=${\displaystyle 11-2,7=}$${\displaystyle 8,3}$.