31/7 * 7/1 - 11/6 * 3/1= 31 - 33/6 = 31- 5 3/6 = 31- 5 1/2 = 25 1/2
31/7:1/7=31/7*7/1=31
11/6*3=11/2=5,5
31-5,5=25,5
31/7 * 7/1 - 11/6 * 3/1= 31 - 33/6 = 31- 5 3/6 = 31- 5 1/2 = 25 1/2
31/7:1/7=31/7*7/1=31
11/6*3=11/2=5,5
31-5,5=25,5