52. Сравните дроби: а) 7/10 и 13/20; б) 2/3 и 5/8; в) 7/10 и 3/4; г) 7/9 и 5/6; д) 7/15 и 9/20.

1. \(\frac7{10}=\frac{14}{20}>\frac{13}{20}\).
2. НОЗ(3, 8) = 24: \(\frac23=\frac{16}{24}>\frac{15}{24}=\frac58\).
3. НОЗ(10, 4) = 20: \(\frac7{10}=\frac{14}{20}<\frac{15}{20}=\frac34\).
4. НОЗ(9, 6) = 18: \(\frac79=\frac{14}{18}<\frac{15}{18}=\frac56\).
5. НОЗ(15, 20) = 60: \(\frac7{15}=\frac{28}{60}<\frac{27}{60}=\frac9{20}\).

Ответ: а) \(\frac7{10}>\frac{13}{20}\); б) \(\frac23>\frac58\); в) \(\frac7{10}<\frac34\); г) \(\frac79<\frac56\); д) \(\frac7{15}>\frac9{20}\).