4. Амалдарды аткаргыла: а) 3/5 + 6/7; б) 5/6 + 1/4; в) 7/8 − 5/6; г) 3/10 − 4/15; д) 1 2/3 + 5/6; е) 5/7 − 3 2/7; ж) 4/9 + 3/8; з) 5/8 : 9/10; и) 1 1/9 · 1 1/2; к) 2 6/7 : 1 3/7; л) 6 3/5 · 10; м) 3 2/3 : 1/6.

а) \(\frac{3}{5}+\frac{6}{7}=\frac{21}{35}+\frac{30}{35}=\frac{51}{35}=1\frac{16}{35}\).

б) \(\frac{5}{6}+\frac{1}{4}=\frac{10}{12}+\frac{3}{12}=\frac{13}{12}=1\frac{1}{12}\).

в) \(\frac{7}{8}-\frac{5}{6}=\frac{21}{24}-\frac{20}{24}=\frac{1}{24}\).

г) \(\frac{3}{10}-\frac{4}{15}=\frac{9}{30}-\frac{8}{30}=\frac{1}{30}\).

д) \(1\frac{2}{3}+\frac{5}{6}=\frac{10}{6}+\frac{5}{6}=2\frac{1}{2}\).

е) \(\frac{5}{7}-3\frac{2}{7}=\frac{5}{7}-\frac{23}{7}=-\frac{18}{7}=-2\frac{4}{7}\).

ж) \(\frac{4}{9}+\frac{3}{8}=\frac{32}{72}+\frac{27}{72}=\frac{59}{72}\).

з) \(\frac{5}{8}:\frac{9}{10}=\frac{5}{8}\cdot\frac{10}{9}=\frac{25}{36}\).

и) \(1\frac{1}{9}\cdot1\frac{1}{2}=\frac{10}{9}\cdot\frac{3}{2}=\frac{5}{3}=1\frac{2}{3}\).

к) \(2\frac{6}{7}:1\frac{3}{7}=\frac{20}{7}:\frac{10}{7}=2\).

л) \(6\frac{3}{5}\cdot10=\frac{33}{5}\cdot10=66\).

м) \(3\frac{2}{3}:\frac{1}{6}=\frac{11}{3}\cdot6=22\).