Контрольная работа Вариант 2. Задание 1. Выполните действие: a) 5/6 * 7/9; б) 11/28 : 33/7; в) 3 5/7 * 1 1/13; г) 2 2/5 : 6; д) 3/8 * 9/16; е) 15/16 : 5.

a) \(\frac{5}{6} \cdot \frac{7}{9} = \frac{5 \cdot 7}{6 \cdot 9} = \frac{35}{54}\) б) \(\frac{11}{28} : \frac{33}{7} = \frac{11}{28} \cdot \frac{7}{33} = \frac{11 \cdot 7}{28 \cdot 33} = \frac{77}{924} = \frac{1}{12}\) в) \(3 \frac{5}{7} \cdot 1 \frac{1}{13} = \frac{26}{7} \cdot \frac{14}{13} = \frac{26 \cdot 14}{7 \cdot 13} = \frac{364}{91} = 4\) г) \(2 \frac{2}{5} : 6 = \frac{12}{5} : 6 = \frac{12}{5} \cdot \frac{1}{6} = \frac{12}{30} = \frac{2}{5}\) д) \(\frac{3}{8} \cdot \frac{9}{16} = \frac{3 \cdot 9}{8 \cdot 16} = \frac{27}{128}\) е) \(\frac{15}{16} : 5 = \frac{15}{16} \cdot \frac{1}{5} = \frac{15}{80} = \frac{3}{16}\)