• Bán Trà Vinh-Bán gà đông tảo giống

    Thảo luận trong 'MB: Chim cảnh - Gà kiểng - Thú cưng' , 28/7/13

    1. bich.le70 Nhà nông nghiệp dư

      <!--[if gte mso 9]><xml> <o:OfficeDocumentSettings> <o:RelyOnVML/> <o:AllowPNG/> </o:OfficeDocumentSettings> </xml><![endif]--> ĐỐ VUI
      Toán là môn học chính xác, vì dựa trên nhũng định lý chỉ chấp nhận sau khi đã chứng minh. Vậy nghịch lý, paradox, chỉ xẩy ra khi người ta làm toán sai!
      Thí dụ:

      Cho a=15, b=5, c=10
      Ta có a=b+c
      Nhân hai vế cho a-c ta có:
      a(a-c)=(b+c)(a-c)
      a.a-a.c=a.b-b.c+a.c-c.c
      Chuyển vế a.b ta có
      a.a-a.b-ac=a.c-b.c-c.c
      Đặt thừa số chung ta có
      a (a-b-c)=c(a-b-c)
      Chia hai vế cho a-b-c ta có
      a=c tức 15=10 ?
      Xin các bạn chỉ cho biết tôi làm toán sai chỗ nào?

      Muốn chia gà đông tảo giống, giá hữu nghị, cho a/c/e nào cần



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    2. bich.le70

      bich.le70 Nhà nông nghiệp dư

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