1 3/5 * 8 = 8/5 * 8 = 64/5
2,9*5 =14,5
64/5 + 14,5 = 128/10 + 29/10 = 157/10 = 15,7
7,5* 1/3 = 75/10 * 1/3 = 25/10 = 2,5
2,5 - 0,5 = 2
15,7 / 2 = 7,85
60 - 18 3/4 = 41 1/4 = 165/4
165/4 / 25 = 165/100
7/12 + 0,15 = 7/12 + 15/100 = 350/600 + 90/600 = 440/600 = 11/12
11/12 * 15 = 55/4
165/10 / 55/4 = 12/100 =0,12
7,85 + 0,12 = 7,97