Пошаговое объяснение:
4/21 * 4 = 16/21
28 * 5/14 = 140/14 = 10
3/20 * 5/6 = 15/120 = 1/8
4/20 * 20/16 = 4/16 = 1/4
51/7 * 18/27 = 51/7 * 2/3 = 102/21 = 4 18/21 = 4 6/7
28/11 * 52/15 = 1456/165 = 8 136/165
Пошаговое объяснение:
4/21 * 4 = 16/21
28 * 5/14 = 140/14 = 10
3/20 * 5/6 = 15/120 = 1/8
4/20 * 20/16 = 4/16 = 1/4
51/7 * 18/27 = 51/7 * 2/3 = 102/21 = 4 18/21 = 4 6/7
28/11 * 52/15 = 1456/165 = 8 136/165