Bán Trà Vinh-Bán gà đông tảo giống

bich.le70

Lữ khách
#1
<!--[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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