Tìm các số a,b,c,d
#1
Đã gửi 23-05-2011 - 14:25
Discovery is a child’s privilege. I mean the small child, the child who is not afraid to be wrong, to look silly, to not be serious, and to act differently from everyone else. He is also not afraid that the things he is interested in are in bad taste or turn out to be different from his expectations, from what they should be, or rather he is not afraid of what they actually are. He ignores the silent and flawless consensus that is part of the air we breathe – the consensus of all the people who are, or are reputed to be, reasonable.
Grothendieck, Récoltes et Semailles (“Crops and Seeds”).
#2
Đã gửi 29-05-2011 - 17:11
$4cab-a-b=d^{2}\Rightarrow 16c^{2}ab-4ca-4cb=4cd^{2}\Rightarrow 4cd^{2}+1=(4ac-1)(4bc-1)$
Đặt $4c=x$, ta có $xd^{2}+1=(xa-1)(xb-1)$. Mọi người có thể hoàn tất lời giải được không ?
Discovery is a child’s privilege. I mean the small child, the child who is not afraid to be wrong, to look silly, to not be serious, and to act differently from everyone else. He is also not afraid that the things he is interested in are in bad taste or turn out to be different from his expectations, from what they should be, or rather he is not afraid of what they actually are. He ignores the silent and flawless consensus that is part of the air we breathe – the consensus of all the people who are, or are reputed to be, reasonable.
Grothendieck, Récoltes et Semailles (“Crops and Seeds”).
#3
Đã gửi 29-05-2011 - 21:46
Rõ ràng VT là số lẻ,VP la số chẵn thì.....Phân tích
$4cab-a-b=d^{2}\Rightarrow 16c^{2}ab-4ca-4cb=4cd^{2}\Rightarrow 4cd^{2}+1=(4ac-1)(4bc-1)$
Đặt $4c=x$, ta có $xd^{2}+1=(xa-1)(xb-1)$. Mọi người có thể hoàn tất lời giải được không ?
Bạn xem lại đê hay không tim đươc No
Và đây là điều duy nhất ta có thể biết 100% trong tương lai
#4
Đã gửi 29-05-2011 - 22:01
Cả hai vế đều lẻ chứ bạn!Rõ ràng VT là số lẻ,VP la số chẵn thì.....
Bạn xem lại đê hay không tim đươc No
Discovery is a child’s privilege. I mean the small child, the child who is not afraid to be wrong, to look silly, to not be serious, and to act differently from everyone else. He is also not afraid that the things he is interested in are in bad taste or turn out to be different from his expectations, from what they should be, or rather he is not afraid of what they actually are. He ignores the silent and flawless consensus that is part of the air we breathe – the consensus of all the people who are, or are reputed to be, reasonable.
Grothendieck, Récoltes et Semailles (“Crops and Seeds”).
#5
Đã gửi 02-06-2011 - 11:26
Việc thêm con c vào 4xy thì cách CM vẫn hoàn toan tương tự
(Lời giải chi tiết xin xem ở cuốn "Chuyên đề 5: PHƯƠNG TRÌNH NGHIỆM NGUYÊN" của thầy PHAN HUY KHẢI trang 175)
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