9 3 27
1). ---- · ---- = ------
10 2 20
11 7 71 19 71·4 - 19·5 284 - 95 189
2) 4 ----- - 1---- = ------ - ------ = ------------------ = ----------- = -------
15 12 15 12 60 60 60
63
= -----
20
63 84 63 10 3
3) ------ : ----- = ------- · ------- = -----
20 10 20 84 8
27 3 2·27 - 5·3 54 - 15 39
4) ---- - ---- = -------------- = ----------- = ----- = 0,975
20 8 40 40 40