а) \( \frac{9}{65}=\frac{90}{650},\ \frac{21}{50}=\frac{273}{650},\ \frac{11}{650}\).
б) \( \frac{32}{63}=\frac{12320}{24255},\ \frac{7}{147}=\frac{1155}{24255},\ \frac{41}{55}=\frac{18081}{24255}\).
в) \( \frac{11}{15}=\frac{44}{60},\ \frac{7}{12}=\frac{35}{60},\ \frac{37}{60}\).
г) \( \frac{71}{108}=\frac{710}{1080},\ \frac{23}{72}=\frac{345}{1080},\ \frac{47}{90}=\frac{564}{1080}\).