Ответ:
- а) \(\frac{3}{5}-\frac{1}{7}=\frac{21}{35}-\frac{5}{35}=\frac{16}{35}\).
- б) \(\frac{5}{13}-\frac{4}{9}=\frac{45}{117}-\frac{52}{117}=-\frac{7}{117}\).
- в) \(\frac{24}{25}-\frac{7}{15}=\frac{72}{75}-\frac{35}{75}=\frac{37}{75}\).
- г) \(\frac{11}{80}-\frac{11}{90}=\frac{99}{720}-\frac{88}{720}=\frac{11}{720}\).
- д) \(5-2\frac{1}{13}=4\frac{13}{13}-2\frac{1}{13}=2\frac{12}{13}\).
- е) \(8\frac{1}{7}-3\frac{1}{9}=5+\frac{9}{63}-\frac{7}{63}=5\frac{2}{63}\).
