№ 7. Сократи дроби: 6/8; 15/25; 21/35; 28/42; 36/54; 44/66; 65/91; 138/184; 287/369.

Числитель и знаменатель делим на их общий делитель: \(\frac{6}{8}=\frac{6:2}{8:2}=\frac{3}{4}\).

\(\frac{15}{25}=\frac{15:5}{25:5}=\frac{3}{5}\).

\(\frac{21}{35}=\frac{21:7}{35:7}=\frac{3}{5}\).

\(\frac{28}{42}=\frac{28:14}{42:14}=\frac{2}{3}\).

\(\frac{36}{54}=\frac{36:18}{54:18}=\frac{2}{3}\).

\(\frac{44}{66}=\frac{44:22}{66:22}=\frac{2}{3}\).

\(\frac{65}{91}=\frac{65:13}{91:13}=\frac{5}{7}\).

\(\frac{138}{184}=\frac{138:46}{184:46}=\frac{3}{4}\).

\(\frac{287}{369}=\frac{287:41}{369:41}=\frac{7}{9}\).