1 1 5
3 ------ : 2 ------ - 2 ------ = 28/9 : 7/3 - 17/6 = 28/9 * 3/7 - 17/6 =
9 3 6
28 * 3 17 4 * 7 17 4 17
= ------------- - -------- = ------------ - ---------- = ------ - --------- =
9 * 7 6 3 * 7 6 3 6
4 * 2 - 17 8 - 17
= ----------------- = --------------- = -9/6 = -3/2 = -1,5
6 6