Находим общий знаменатель: \(\frac{2}{7}+\frac{3}{8}=\frac{16}{56}+\frac{21}{56}=\frac{37}{56}\).
\(\frac{3}{13}-\frac{6}{8}=\frac{3}{13}-\frac{3}{4}=\frac{12}{52}-\frac{39}{52}=-\frac{27}{52}\).
Сокращаем первую дробь: \(\frac{6}{15}-\frac{7}{11}=\frac{2}{5}-\frac{7}{11}=\frac{22}{55}-\frac{35}{55}=-\frac{13}{55}\).
\(\frac{9}{5}-\frac{10}{7}=\frac{63}{35}-\frac{50}{35}=\frac{13}{35}\).
\(\frac{7}{17}-\frac{5}{9}=\frac{63}{153}-\frac{85}{153}=-\frac{22}{153}\).
\(\frac{8}{9}+\frac{2}{11}=\frac{88}{99}+\frac{18}{99}=\frac{106}{99}\).
\(\frac{6}{2}-\frac{10}{15}=3-\frac{2}{3}=\frac{7}{3}\).
\(\frac{3}{10}-\frac{7}{6}=\frac{9}{30}-\frac{35}{30}=-\frac{26}{30}=-\frac{13}{15}\).
\(\frac{10}{20}-\frac{6}{18}=\frac{1}{2}-\frac{1}{3}=\frac{1}{6}\).
\(\frac{6}{8}+\frac{1}{16}=\frac{12}{16}+\frac{1}{16}=\frac{13}{16}\).
\(\frac{5}{11}-\frac{6}{5}=\frac{25}{55}-\frac{66}{55}=-\frac{41}{55}\).
\(\frac{2}{25}+\frac{6}{13}=\frac{26}{325}+\frac{150}{325}=\frac{176}{325}\).
\(\frac{4}{13}+\frac{6}{11}=\frac{44}{143}+\frac{78}{143}=\frac{122}{143}\).
\(\frac{1}{10}-\frac{3}{14}=\frac{7}{70}-\frac{15}{70}=-\frac{8}{70}=-\frac{4}{35}\).
\(\frac{2}{11}-\frac{3}{17}=\frac{34}{187}-\frac{33}{187}=\frac{1}{187}\).

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