Сократите дроби: 2/4; 20/30; 28/48; 20/100; 8/18; 8/16; 8/12; 20/32; 4/10; 12/15; 4/6; 6/9; 16/18; 14/49; 12/18; 45/100; 36/48; 32/40; 45/54; 120/144; 3/6; 20/50; 8/10; 11/33; 4/12; 70/80; 12/48; 8/24; 13/26; 2/14; 25/150; 48/56.

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Сокращаем каждую дробь, разделив числитель и знаменатель на их общий делитель.

Первый столбец: \(\frac{2}{4}=\frac{1}{2};\ \frac{20}{30}=\frac{2}{3};\ \frac{28}{48}=\frac{7}{12};\ \frac{20}{100}=\frac{1}{5};\ \frac{8}{18}=\frac{4}{9};\ \frac{8}{16}=\frac{1}{2};\ \frac{8}{12}=\frac{2}{3};\ \frac{20}{32}=\frac{5}{8}\).
Второй столбец: \(\frac{4}{10}=\frac{2}{5};\ \frac{12}{15}=\frac{4}{5};\ \frac{4}{6}=\frac{2}{3};\ \frac{6}{9}=\frac{2}{3};\ \frac{16}{18}=\frac{8}{9};\ \frac{14}{49}=\frac{2}{7};\ \frac{12}{18}=\frac{2}{3};\ \frac{45}{100}=\frac{9}{20}\).
Третий столбец: \(\frac{36}{48}=\frac{3}{4};\ \frac{32}{40}=\frac{4}{5};\ \frac{45}{54}=\frac{5}{6};\ \frac{120}{144}=\frac{5}{6};\ \frac{3}{6}=\frac{1}{2};\ \frac{20}{50}=\frac{2}{5};\ \frac{8}{10}=\frac{4}{5};\ \frac{11}{33}=\frac{1}{3}\).
Четвёртый столбец: \(\frac{4}{12}=\frac{1}{3};\ \frac{70}{80}=\frac{7}{8};\ \frac{12}{48}=\frac{1}{4};\ \frac{8}{24}=\frac{1}{3};\ \frac{13}{26}=\frac{1}{2};\ \frac{2}{14}=\frac{1}{7};\ \frac{25}{150}=\frac{1}{6};\ \frac{48}{56}=\frac{6}{7}\).

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