ж) 1/2 − 1/3; к) 8/9 − 0; з) 3/5 − 4/7; л) 3/4 + 4/5; и) 5/7 − 1/6; м) 3/4 + 2/9

1. ж) \(\frac{1}{2}-\frac{1}{3}=\frac{3}{6}-\frac{2}{6}=\frac{1}{6}\).
2. к) \(\frac{8}{9}-0=\frac{8}{9}\).
3. з) \(\frac{3}{5}-\frac{4}{7}=\frac{21}{35}-\frac{20}{35}=\frac{1}{35}\).
4. л) \(\frac{3}{4}+\frac{4}{5}=\frac{15}{20}+\frac{16}{20}=\frac{31}{20}=1\frac{11}{20}\).
5. и) \(\frac{5}{7}-\frac{1}{6}=\frac{30}{42}-\frac{7}{42}=\frac{23}{42}\).
6. м) \(\frac{3}{4}+\frac{2}{9}=\frac{27}{36}+\frac{8}{36}=\frac{35}{36}\).

Ответ: ж) \(\frac{1}{6}\); к) \(\frac{8}{9}\); з) \(\frac{1}{35}\); л) \(1\frac{11}{20}\); и) \(\frac{23}{42}\); м) \(\frac{35}{36}\).