Ответ:
- а) \(\frac{3}{16}+\frac{5}{8}=\frac{3}{16}+\frac{10}{16}=\frac{13}{16}\).
- б) \(\frac{19}{21}-\frac{3}{7}=\frac{19}{21}-\frac{9}{21}=\frac{10}{21}\).
- в) \(\frac{1}{2}+\frac{1}{5}=\frac{5}{10}+\frac{2}{10}=\frac{7}{10}\).
- г) \(6\frac{5}{6}+2\frac{3}{8}=8+\frac{20}{24}+\frac{9}{24}=8+1\frac{5}{24}=10\frac{5}{24}\).
- д) \(\left(9-2\frac{2}{3}\cdot2\frac{1}{7}\right)\cdot\frac{21}{46}=\left(9-\frac{8}{3}\cdot\frac{15}{7}\right)\cdot\frac{21}{46}=\left(9-\frac{40}{7}\right)\cdot\frac{21}{46}=\frac{23}{7}\cdot\frac{21}{46}=\frac{3}{2}=1\frac{1}{2}\).
- е) \(5\frac{2}{3}:\frac{1}{3}-1\frac{7}{12}\cdot6=\frac{17}{3}\cdot3-\frac{19}{12}\cdot6=17-\frac{19}{2}=\frac{15}{2}=7\frac{1}{2}\).
Ответ: а) \(\frac{13}{16}\); б) \(\frac{10}{21}\); в) \(\frac{7}{10}\); г) \(10\frac{5}{24}\); д) \(1\frac{1}{2}\); е) \(7\frac{1}{2}\).
