1) 3 1/3 : 2/3 *1/5 ;
3) 3 1/5 *5/8 : 2/7 ;
5) 4 1/8 *6/11 : 2 1/4
​

Пошаговое объяснение:

1) = 10/3 * 3/2 * 1/5 = 10/2 * 1/5 = 5 * 1/5 = 5/5 = 1

2) = 16/5 * 5/8 * 7/2 = 16/8 * 7/2 = 2 * 7/2 = 14/2 = 7

3) = 33/8 * 6/11 * 4/9 = 3/4 * 3/1 * 4/9 = 9/4 * 4/9 = 1