2.165 Найдите разность: а) $$\frac{5}{6} - \frac{5}{10}$$; б) $$\frac{3}{20} - \frac{3}{28}$$; в) $$\frac{3}{4} - \frac{1}{14}$$; г) $$\frac{7}{15} - \frac{2}{39}$$; д) $$\frac{26}{33} - \frac{7}{44}$$; е) $$\frac{11}{21} - \frac{3}{14}$$; ж) $$\frac{9}{22} - \frac{7}{26}$$; з) $$\frac{33}{40} - \frac{7}{15}$$

a) $$\frac{5}{6} - \frac{5}{10} = \frac{25}{30} - \frac{15}{30} = \frac{10}{30} = \frac{1}{3}$$

б) $$\frac{3}{20} - \frac{3}{28} = \frac{21}{140} - \frac{15}{140} = \frac{6}{140} = \frac{3}{70}$$

в) $$\frac{3}{4} - \frac{1}{14} = \frac{21}{28} - \frac{2}{28} = \frac{19}{28}$$

г) $$\frac{7}{15} - \frac{2}{39} = \frac{91}{195} - \frac{10}{195} = \frac{81}{195} = \frac{27}{65}$$

д) $$\frac{26}{33} - \frac{7}{44} = \frac{104}{132} - \frac{21}{132} = \frac{83}{132}$$

е) $$\frac{11}{21} - \frac{3}{14} = \frac{22}{42} - \frac{9}{42} = \frac{13}{42}$$

ж) $$\frac{9}{22} - \frac{7}{26} = \frac{117}{286} - \frac{77}{286} = \frac{40}{286} = \frac{20}{143}$$

з) $$\frac{33}{40} - \frac{7}{15} = \frac{99}{120} - \frac{56}{120} = \frac{43}{120}$$