Ответ:

  1. \(\frac{2}{3}+\frac{5}{8}=\frac{16}{24}+\frac{15}{24}=\frac{31}{24}=1\frac{7}{24}\).
  2. \(\frac{7}{12}-\frac{3}{8}=\frac{14}{24}-\frac{9}{24}=\frac{5}{24}\).
  3. \(\frac{11}{16}-\frac{5}{8}=\frac{11}{16}-\frac{10}{16}=\frac{1}{16}\).
  4. \(\frac{6}{35}+\frac{3}{10}=\frac{12}{70}+\frac{21}{70}=\frac{33}{70}\).
  5. \(\frac45-\frac23+\frac4{15}=\frac{12}{15}-\frac{10}{15}+\frac4{15}=\frac6{15}=\frac25\).
  6. \(\frac78+\frac{11}{12}-\frac56=\frac{21}{24}+\frac{22}{24}-\frac{20}{24}=\frac{23}{24}\).
  7. \(\frac25+\frac13-\frac7{30}=\frac{12}{30}+\frac{10}{30}-\frac7{30}=\frac12\).
  8. \(\frac34-\frac29+\frac5{36}=\frac{27}{36}-\frac8{36}+\frac5{36}=\frac{24}{36}=\frac23\).
  9. \(\frac89-\frac56+\frac13=\frac{16}{18}-\frac{15}{18}+\frac6{18}=\frac7{18}\).
  10. \(\frac9{16}+\frac56-\frac7{12}=\frac{27}{48}+\frac{40}{48}-\frac{28}{48}=\frac{39}{48}=\frac{13}{16}\).

Ответ: 1) \(1\frac7{24}\); 2) \(\frac5{24}\); 3) \(\frac1{16}\); 4) \(\frac{33}{70}\); 5) \(\frac25\); 6) \(\frac{23}{24}\); 7) \(\frac12\); 8) \(\frac23\); 9) \(\frac7{18}\); 10) \(\frac{13}{16}\).