целых 6\7*2 целых 11\40
6)42 целых 2\3: 4 целых 20\27

Пошаговое объяснение:

1)

25/49 * 21/50 = 15/70 = 3/14,

2)

49/64 : 81/96 = 49/64 * 96/81 = 49/54,

3)

121/140 * 350/363 = 5/6,

4)

39/203 : 78/145 = 39/203 * 145/78 = 145/406,

5)

22 6/7 * 2 11/40 = 160/7 * 91/40 = 4 * 13 = 52,

6)

42 2/3 : 4 20/27 = 128/3 : 116/27 = 128/3 * 27/116 = 288/29 = 9 27/29