xl minh chi giup dc bn bai 2 thoi ^^
2.
Neu do day coc ca phe thi duoc 3/3 cai coc
Binh uong di 1/3 thi con lai 2/3 ma Binh thi do nuoc loc vao nen nuoc loc la 2/3
Binh lai do them 1/2 coc vao co nghia la : 2/3 + 1/2
So nuoc loc la : 1.2 +2/3 = 7/6
Ma : 7/6 > 3/3
Nen nuoc loc nhieu hon