要用刪減法以天平3個情況(左重D,兩邊一樣,右重D)去推算出來5.39.217.76# @0 P' `5 ^7 l m0 @
要先4-4
2 p; d" f. M% \& q% l% q" z5.39.217.76之後睇天平結果後要 3-3(拿走一粒,交換一粒及換一粒已知冇異常上去)或1-1(拿走一粒,交換一粒)5.39.217.764 |- a- H3 Z" E& U) M" C3 ~( j+ ]
之後睇天平結果後要1-1(拿走一粒,交換一粒及換一粒已知冇異常上去)或(交換一粒及換一粒已知冇異常上去) |