9/20 : 0, 09 + 3, 61 : 1/5 - 18, 63
9/20 : 0,09 + 3,61: 1/5 - 18,63 = 9/20 : 9/100 + 361/100 : 1/5 - 18,63 = 9/20 * 100/9 + 361/100 * 5/1 - 18,63 = 900/180 + 1805/100 - 18,63 = 5 + 18,05 - 18,63 = 23,05 - 18,63 = 4,42