Ответ:
а)
\(1-\frac{17}{18}=\frac{1}{18}\).
\(\frac{1}{6}-\frac{1}{18}=\frac{3}{18}-\frac{1}{18}=\frac{2}{18}=\frac{1}{9}\).
б)
\(\frac{11}{14}-\frac{13}{21}=\frac{33}{42}-\frac{26}{42}=\frac{7}{42}=\frac{1}{6}\).
\(3-\frac{1}{6}=2\frac{5}{6}\).
в)
\(3\frac{8}{15}+1\frac{9}{10}=4+\frac{16}{30}+\frac{27}{30}=5\frac{13}{30}\).
\(7\frac{14}{25}-5\frac{13}{30}=2+\frac{84}{150}-\frac{65}{150}=2\frac{19}{150}\).
г)
\(6\frac{3}{16}-2\frac{5}{24}-3\frac{11}{12}=1+\frac{9}{48}-\frac{10}{48}-\frac{44}{48}\).
\(1-\frac{45}{48}=1-\frac{15}{16}=\frac{1}{16}\).
Ответ: а) \(\frac{1}{9}\); б) \(2\frac{5}{6}\); в) \(2\frac{19}{150}\); г) \(\frac{1}{16}\).
