Найдите сумму: 11/30 + 4/15 + 3/10; 17/40 + 9/20 + 1/10; 2/5 + 3/8 + 7/10.

\[\frac{11}{30}+\frac{4}{15}+\frac{3}{10}=\frac{11}{30}+\frac{8}{30}+\frac{9}{30}=\frac{28}{30}=\frac{14}{15}\] \[\frac{17}{40}+\frac{9}{20}+\frac{1}{10}=\frac{17}{40}+\frac{18}{40}+\frac{4}{40}=\frac{39}{40}\] \[\frac{2}{5}+\frac{3}{8}+\frac{7}{10}=\frac{16}{40}+\frac{15}{40}+\frac{28}{40}=\frac{59}{40}=1\frac{19}{40}\]

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