Выполните умножения:6/25 * 20/21 3/16 * 417/30 * 26/51 23 *

1. 6/25 * 20/21 = (6 * 20)/(25 * 21) = 120/525 сократим на 15 = 8/35.
2. 3/16 * 4 = (4 * 3)/16 = 12/16 на 4 = 3/4.
3. 17/30 * 26/51 = (17 * 26)/(30 * 51) = 442/1530 сократим на 34 = 13/45.
4. 23 * 5/46 = (23 * 5)/46 = 115/46 сократим на 23 = 5/2 = 2 1/2.
5. 40/7 * 14/5 = (40 * 14)/(7 * 5) = 560/35 = 16.
6. 15/13 * 39 = (15 * 39)13 = 585/13 = 45.
7. 57/37 * 74/86 = (57 * 74)/(37 * 86) = 4218/3182 сократим на 74 = 57/43 = 1 14/43.
8. 5 * 2 1/5 = 5 * (2 * 5 + 1)/5 = 5 * 11/5 = 55/5 = 11.
9. 81/115 * 46/81 = (81 * 46)/(115 * 81) = 3726/9315 сократим на 1863 = 2/5.