Question

Пожалуйста помогите!
5/12 × 7/8 =
6/7 × 8/9 =
12/13 × 2/3 =
4/9 × 27/16 =
14/25 × 10/49 =
13/10 × 100/39 =
15/14 × 7/12 =
45/34 × 17/15 =