Ответ:

а) \(\frac{2}{15}+\frac{4}{15}=\frac{6}{15}=\frac{2}{5}\).

б) \(\frac{4}{3}-\frac{2}{11}=\frac{44}{33}-\frac{6}{33}=\frac{38}{33}=1\frac{5}{33}\).

в) \(\frac{11}{12}-\frac{23}{60}=\frac{55}{60}-\frac{23}{60}=\frac{32}{60}=\frac{8}{15}\).

г) \(\frac{17}{51}+\frac{11}{33}=\frac{17}{51}+\frac{17}{51}=\frac{34}{51}=\frac{2}{3}\).

д) \(1-\frac{5}{8}=\frac{8}{8}-\frac{5}{8}=\frac{3}{8}\).

е) \(10-1\frac{1}{9}=10-\frac{10}{9}=\frac{80}{9}=8\frac{8}{9}\).

ж) \(9\frac{5}{6}-2\frac{3}{4}=7+\left(\frac{5}{6}-\frac{3}{4}\right)=7+\frac{1}{12}=7\frac{1}{12}\).

и) \(8\frac{1}{4}-3\frac{1}{3}=5+\left(\frac{1}{4}-\frac{1}{3}\right)=4\frac{11}{12}\).

г) \(3.3-1\frac{7}{15}=\frac{33}{10}-\frac{22}{15}=\frac{99-44}{30}=\frac{55}{30}=1\frac{5}{6}\).

д) \(5\frac{3}{24}-1\frac{1}{21}=\frac{43}{8}-\frac{22}{21}=\frac{903-176}{168}=\frac{727}{168}=4\frac{55}{168}\). Следовательно, указанное в условии равенство \(4\frac{13}{168}\) неверно.

Ответ: а) \(\frac{2}{5}\); б) \(1\frac{5}{33}\); в) \(\frac{8}{15}\); г) \(\frac{2}{3}\); д) \(\frac{3}{8}\); е) \(8\frac{8}{9}\); ж) \(7\frac{1}{12}\); и) \(4\frac{11}{12}\); г) \(1\frac{5}{6}\); д) \(4\frac{55}{168}\).