а) 1/2 * 1/2 : 3/2
1) 1/2 * 1/2 = 1/4
2) 1/4 : 3/2 = 1/4 * 2/3
3) 1/2 * 1/3 = 1/6
б) 25 * 7/15 : 25/27
1) 25/1 * 7/15 = 5/1 * 7/3 = 35/3
2) 35/3 : 25/27 = 35/3 * 27/25
3) 7/1 * 9/5 = 63/5 = 12.6
в) 5.9 * 2, 1/4 : 20
1) 59/10 * 9/4 = 531/40
2) 531/40 : 20/1 = 531/40 * 1/20
3) 531/40 * 1/20 = 531/800 = 0,66375