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co 4 nguoi vao quan uong nuoc hot 25000, 3 nguoi gop tien vao tra moi nguoi 10000 dc 30000 . chu quan tra lai 5000, nguoi thu 4 giu lai 2000;con lai 3000 chia deu cho 3 nguoi moi nguoi 1000. nhu vay 3 nguoi chi phai gop 9000. ta co phep tinh: 9000 nhan 3 = 27000 +2000 = 2900. vay con 1000 o dau?
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