Question

Помогите с примером 5 класс
8/21 * 7/10 = ? ; 8/15 * 25/28 = ?

Answer 1

1) 8/21 * 7/10 = 8*7 / 21*10 = 4/15
2) 8/15 * 25/28 = 8*25 / 15*28 = 10/21