Ответ:
- а) \(5\frac{6}{7}-2=3\frac{6}{7}\).
- б) \(1-\frac{17}{30}=\frac{30}{30}-\frac{17}{30}=\frac{13}{30}\).
- в) \(10-\frac{9}{13}=9\frac{13}{13}-\frac{9}{13}=9\frac{4}{13}\).
- г) \(7-2\frac{8}{21}=6\frac{21}{21}-2\frac{8}{21}=4\frac{13}{21}\).
- д) \(10\frac{9}{20}-6\frac{3}{8}=10\frac{18}{40}-6\frac{15}{40}=4\frac{3}{40}\).
- е) \(6\frac{5}{7}+2=8\frac{5}{7}\).
- ж) \(18\frac{7}{8}+8\frac{7}{12}=26+\frac{21}{24}+\frac{14}{24}=26+1\frac{11}{24}=27\frac{11}{24}\).
- з) \(8\frac{1}{20}-4\frac{5}{8}=8\frac{2}{40}-4\frac{25}{40}=7\frac{42}{40}-4\frac{25}{40}=3\frac{17}{40}\).
Ответ: а) \(3\frac{6}{7}\); б) \(\frac{13}{30}\); в) \(9\frac{4}{13}\); г) \(4\frac{13}{21}\); д) \(4\frac{3}{40}\); е) \(8\frac{5}{7}\); ж) \(27\frac{11}{24}\); з) \(3\frac{17}{40}\).
