a)5/12 : (4-9)/12 - 5/3 · 6/5 =
5/12 : (-5)/12 - 2 =
5/12 · 12/(-5) - 2 =
-1-2=
-3
b)15/4 + (6√5-3√5)/10 · √5/3 =
15/4 + 3√5/10 · √5/3 =
15/4 + 5/10 =
15/4 + 1/2 =
15/4 + 2/4 =
17/4
c)5√2 + 3√6 · (3√2/2 - 5√3/9) - 6√3 =
5√2 + 3√6 · (27√2 - 10√3)/18 - 6√3 =
5√2 + (54√3 - 30√2)/6 - 6√3 =
(30√2+54√3-30√2-36√3)/6 =
18√3/6=
3√3