Răspuns :
28-19=9 dl(al treilea);17-9=8 dl (al doilea);19-8=11dl(primul)
|-----|---| =19 dl
|-----|---| =19dl,17dl 28 dl
|-----|=17 dl
19dl+19dl=38 dl primele doua
17dl+17dl=34 dl in ultimele doua
|-----|---| =19dl,17dl 28 dl
|-----|=17 dl
19dl+19dl=38 dl primele doua
17dl+17dl=34 dl in ultimele doua