1) -2,04 = -204/100
2) -204/100 / 1/25 = -204/100 * 25/1 = -51
3) 3,61 = 361/100
4) -361/100 / 19/40 = -361/100 * 40/19 = -38/5 = -7,6
5) -51 - (-7,6) = -51 + 7,6 = -43,4
6) -2 * 4/5 = -1,6
7) -43,4/(-1,6) = 27,125
8) 0,6/(-0,9) = -2/3
9) 27,125 - 2/3 = 27125/1000 - 2/3 = 81375/3000 - 2000/3000=79375/3000