44. Приведите к наименьшему общему знаменателю дроби: а) 5/16 и 7/12; б) 2/21 и 3/14; в) 7/15, 5/18 и 11/30.

1. НОК\((16,12)=48\): \(\dfrac5{16}=\dfrac{15}{48}\), \(\dfrac7{12}=\dfrac{28}{48}\).
2. НОК\((21,14)=42\): \(\dfrac2{21}=\dfrac4{42}\), \(\dfrac3{14}=\dfrac9{42}\).
3. НОК\((15,18,30)=90\): \(\dfrac7{15}=\dfrac{42}{90}\), \(\dfrac5{18}=\dfrac{25}{90}\), \(\dfrac{11}{30}=\dfrac{33}{90}\).

Ответ: а) \(\frac{15}{48}\) и \(\frac{28}{48}\); б) \(\frac4{42}\) и \(\frac9{42}\); в) \(\frac{42}{90},\frac{25}{90},\frac{33}{90}\).