con` 12 dong` thy` chia lam` 4
lay 2 trong 4 phan dem can
neu ben nao` nhe hay nag hon thy` co' chua' dong tien gia (roi` lay 3 dong tien ben nhe. hon dem ca^n thy` ben nao` nhe hay nag hon thy` ben do' la` dong tien gia, con 2 ben = nhau thy` dong con` lai la` tien gia)
con` neu 2 ben = nhau thy` dong tien gia nam` trong 2 phan con lai
roi lay 2 phai con` lai dem can ben nao` nhe hay nang hon thy` ben do' co' chua' dong` tien` gia
roi` lay' ben co' chua' dong` tien` gia dem can
lay' 2 dong` dem can dong` nao` nhe hay nang hon la` dong gia
con` neu 2 dong = nhau thy` dong con` lai là dong` giả
Em giai nhu vay la` dung' ko ah? cho em bik loi` giai dap nha'