(-4 7/10-1 2/15):(-4 39/54)=
-47 17 - 255 -47*3 - 17*2 54
= (--------- - ----------) : ----------- = ------------------- * -------------- =
10 15 54 30 -255
( - 141 - 34) * 54 -175 * 9 35 * 9 7 * 9
= ------------------------- = ---------------- = -------------- = ---------- =
- 30 * 255 -5 * 255 5 * 51 1*51
21 4
= ------------- = 1 -----------
17 17