Ответ:
а) \(\frac{5}{6}-\frac{7}{18}=\frac{15}{18}-\frac{7}{18}=\frac{8}{18}=\frac{4}{9}\).
б) \(4\frac{2}{21}-2\frac{9}{14}=\frac{86}{21}-\frac{37}{14}=\frac{172}{42}-\frac{111}{42}=\frac{61}{42}=1\frac{19}{42}\).
в) \(0{,}32=\frac{8}{25}\). Тогда \(\frac{41}{45}-\frac{8}{25}=\frac{205}{225}-\frac{72}{225}=\frac{133}{225}\).
Ответ: а) \(\frac{4}{9}\); б) \(1\frac{19}{42}\); в) \(\frac{133}{225}\).
