6,58(3)=6 intregi (583-58)/900=(5400+525)/900=5925/900=79/12
4,2(7)=4 intregi (27-2)/90=(360+25)/90=385/90=77/18
0,61(36)=(6136-61)/9900=6075/9900=27/44
10-(79/12 - 77/18 · 27/44):19/36=
10-(79/12 - 21/8) · 36/19=
10-(79·2-21·3)/24 · 36/19=
10-(158-63)/24 · 36/19=
10-95/24 · 36/19=
10-15/2=
(20-15)/2=
5/2=
2,5
