Выполните действия 8/15*25/28 45*18/25 15/16*24 2/4*10/11*2/5 20/13*10/21*39/100

1) 8/15 * 25/28 = (8 * 25) / (15 * 28) = (4 * 2 * 5 * 5) / (3 * 5 * 4 * 7) = (2 * 5) / (3 * 7) = 10/21;

2) 45 * 18/25 = (45 * 18) / 25 = (9 * 5 * 18) / (5 * 5) = (9 * 18) / 5 = 162/5 = 32 (162 - 32 * 5) / 5 = 32 2/5;

3) 15/16 * 24 = (15 * 24) / 16 = (15 * 8 * 3) / (8 * 2) = (15 * 3) / 2 = 45/2 = 22 1/2;

4) 2/4 * 10/11 * 2/5 = (2 * 10 * 2) / (4 * 11 * 5) = (2 * 2 * 5 * 2) / (2 * 2 * 11 * 5) = 2/11;

5) 20/13 * 10/21 * 39/100 = (20 * 10 * 39) / (13 * 21 * 100) = (10 * 2 * 10 * 13 * 3) / (13 * 21 * 10 * 10) = (2 * 3) / 21 = 6/21.