Вариант 2. Вычислите: а) 6/7 − 9/14; б) 9/20 − 5/12; в) 6/7 − 2/3; г) 11/12 − 5/6; д) 5/9 − 3/8; е) 7/9 − 5/12; ж) 7/12 − 3/8; з) 1/10 − 1/12; и) 7/18 − 1/45; к) 11/42 − 5/28; л) 9/14 − 19/35; м) 9/20 − 1/30.

а) \(\frac{6}{7}-\frac{9}{14}=\frac{12-9}{14}=\frac{3}{14}\).

б) \(\frac{9}{20}-\frac{5}{12}=\frac{27-25}{60}=\frac{1}{30}\).

в) \(\frac{6}{7}-\frac{2}{3}=\frac{18-14}{21}=\frac{4}{21}\).

г) \(\frac{11}{12}-\frac{5}{6}=\frac{11-10}{12}=\frac{1}{12}\).

д) \(\frac{5}{9}-\frac{3}{8}=\frac{40-27}{72}=\frac{13}{72}\).

е) \(\frac{7}{9}-\frac{5}{12}=\frac{28-15}{36}=\frac{13}{36}\).

ж) \(\frac{7}{12}-\frac{3}{8}=\frac{14-9}{24}=\frac{5}{24}\).

з) \(\frac{1}{10}-\frac{1}{12}=\frac{6-5}{60}=\frac{1}{60}\).

и) \(\frac{7}{18}-\frac{1}{45}=\frac{35-2}{90}=\frac{11}{30}\).

к) \(\frac{11}{42}-\frac{5}{28}=\frac{22-15}{84}=\frac{1}{12}\).

л) \(\frac{9}{14}-\frac{19}{35}=\frac{45-38}{70}=\frac{1}{10}\).

м) \(\frac{9}{20}-\frac{1}{30}=\frac{27-2}{60}=\frac{5}{12}\).