vay voi so 11 thi sao. Em moi doc o dau do', ghi la` so chia het cho 11 la so co' hie^.u cua? to^?ng cac' chu so o vi tri' chan cua so^' do'(hang` chu.c, hang` nghin, hang` tram nghi`n.....) voi' to^?ng cac' chu*~ so^' o*? vi. tri' le? (hang` don vi., hang` tram, hang` chu.c nghin`...) chia he^'t cho 11. Co dung' ko??? Sao nghe no' cu*' ki` ki`!?!
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