Ответ:

а) \(\frac56+\frac27=\frac{35}{42}+\frac{12}{42}=\frac{47}{42}=1\frac5{42}\).

б) \(\frac{11}{25}-\frac3{10}=\frac{22}{50}-\frac{15}{50}=\frac7{50}\).

в) \(\frac{15}{16}-\frac34=\frac{15}{16}-\frac{12}{16}=\frac3{16}\).

г) \(\frac3{20}+\frac7{15}=\frac9{60}+\frac{28}{60}=\frac{37}{60}\).

д) \(\frac{13}{16}-\frac7{12}=\frac{39}{48}-\frac{28}{48}=\frac{11}{48}\).

е) \(\frac9{14}+\frac5{21}=\frac{27}{42}+\frac{10}{42}=\frac{37}{42}\).

Ответ: а) \(1\frac5{42}\); б) \(\frac7{50}\); в) \(\frac3{16}\); г) \(\frac{37}{60}\); д) \(\frac{11}{48}\); е) \(\frac{37}{42}\).