Ответ:
а) \(\frac{20}{27}-\frac{16}{35}=\frac{700}{945}-\frac{432}{945}=\frac{268}{945}\).
б) \(\frac{40}{63}-\frac{35}{72}=\frac{320}{504}-\frac{245}{504}=\frac{75}{504}=\frac{25}{168}\).
в) \(\frac{22}{21}-\frac{21}{22}=\frac{484}{462}-\frac{441}{462}=\frac{43}{462}\).
г) \(\frac{43}{126}-\frac{41}{135}=\frac{1935}{5670}-\frac{1722}{5670}=\frac{213}{5670}=\frac{71}{1890}\).
е) \(\frac{239}{240}-\frac{229}{288}=\frac{1434}{1440}-\frac{1145}{1440}=\frac{289}{1440}\).
Ответ: а) \(\frac{268}{945}\); б) \(\frac{25}{168}\); в) \(\frac{43}{462}\); г) \(\frac{71}{1890}\); е) \(\frac{289}{1440}\).
