Выполните сложение: а) \(\frac{3}{4}+\frac{2}{3}\); б) \(\frac{3}{10}+\frac{2}{15}\); в) \(\frac{4}{9}+\frac{1}{6}\); г) \(\frac{7}{15}+\frac{3}{40}\); д) \(\frac{6}{7}+\frac{9}{21}\); е) \(\frac{11}{20}+\frac{6}{15}\).

а) \(\frac{3}{4}+\frac{2}{3}=\frac{9}{12}+\frac{8}{12}=\frac{17}{12}=1\frac{5}{12}\).

б) \(\frac{3}{10}+\frac{2}{15}=\frac{9}{30}+\frac{4}{30}=\frac{13}{30}\).

в) \(\frac{4}{9}+\frac{1}{6}=\frac{8}{18}+\frac{3}{18}=\frac{11}{18}\).

г) \(\frac{7}{15}+\frac{3}{40}=\frac{56}{120}+\frac{9}{120}=\frac{65}{120}=\frac{13}{24}\).

д) \(\frac{6}{7}+\frac{9}{21}=\frac{18}{21}+\frac{9}{21}=\frac{27}{21}=\frac{9}{7}=1\frac{2}{7}\).

е) \(\frac{11}{20}+\frac{6}{15}=\frac{33}{60}+\frac{24}{60}=\frac{57}{60}=\frac{19}{20}\).

Ответ: а) \(1\frac{5}{12}\); б) \(\frac{13}{30}\); в) \(\frac{11}{18}\); г) \(\frac{13}{24}\); д) \(1\frac{2}{7}\); е) \(\frac{19}{20}\).