2_CMR: $n^{4} - 4 n^{3} + 16 \vdots 384$ với n chẵn.
3_CMR: $n^{2} + 4n -5 \vdots 8$ với n là sô nguyên lẻ.
Bài viết đã được chỉnh sửa nội dung bởi Phạm Quang Toàn: 27-08-2011 - 21:33
Bài viết đã được chỉnh sửa nội dung bởi Phạm Quang Toàn: 27-08-2011 - 21:33
Doesn't mean the all
Doesn't mean nothing
Doesn't mean the best
Doesn't mean the worst
1_CMR: $n^{4} - n^{2} \vdots 12$ với $n \in Z$
2_CMR: $n^{4} - 4 n^{3} + 16 \vdots 384$ với n chẵn.
3_CMR: $n^{2} + 4n -5 \vdots 8$ với n là sô nguyên lẻ.
3. $n^2+4n-5=n(n+4)-5$1_CMR: $n^{4} - n^{2} \vdots 12$ với $n \in Z$
2_CMR: $n^{4} - 4 n^{3} + 16 \vdots 384$ với n chẵn.
3_CMR: $n^{2} + 4n -5 \vdots 8$ với n là sô nguyên lẻ.
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”).
Bài toán sai, thử với $n=3$.Tiếp tục với bài sau :
Bài 4: Với $ n\in N$ CMR:
$ n^n-1 \vdots (n-1)^2$
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”).
admin có khác bài 2 sai đề thiệt mới tham gia nên chưa quen xài lắm mà sao em không gõ số mũ được trong trả lời nhanh được vậy đề phải là $n^{4} - 4 n^{3}-4 n^{2} +16n \vdots 384$.Bài toán sai, thử với $n=3$.
Mình nghĩ đề nên là $(n^n-1) \vdots (n-1)^2$.
Thật vậy ta có $n^n-n=n(n-1)(n^{n-2}+n^{n-3}+...+1)=\left [(n^{n-2}-1)+(n^{n-3}-1)+...+(n^2-1)+(n-1)+n-1 \right ]\vdots \left (n-1 \right )$.
Vậy $(n^n-1) \vdots (n-1)^2$.
Bài viết đã được chỉnh sửa nội dung bởi Phạm Quang Toàn: 05-09-2011 - 12:30
Doesn't mean the all
Doesn't mean nothing
Doesn't mean the best
Doesn't mean the worst
Doesn't mean the all
Doesn't mean nothing
Doesn't mean the best
Doesn't mean the worst
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”).
Doesn't mean the all
Doesn't mean nothing
Doesn't mean the best
Doesn't mean the worst
Doesn't mean the all
Doesn't mean nothing
Doesn't mean the best
Doesn't mean the worst
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”).
1_CMR: $n^{4} - n^{2} \vdots 12$ với $n \in Z$
2_CMR: $n^{4} - 4 n^{3} + 16 \vdots 384$ với n chẵn.
3_CMR: $n^{2} + 4n -5 \vdots 8$ với n là sô nguyên lẻ.
Bài viết đã được chỉnh sửa nội dung bởi Hoa Hồng Lắm Gai: 05-09-2011 - 21:16
Ác Ma Học Đường- Cá Sấu
Cao Xuân Huy tự hào là thành viên VMF
Các bạn cho mình hỏi phương pháp lùi vô hạn là gì thế
Bài 2 GPT nghiệm nguyên. (PP lùi vô hạn)
b. $x^2+y^2+z^2=2xyz$
Bài viết đã được chỉnh sửa nội dung bởi Phạm Quang Toàn: 06-09-2011 - 14:03
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”).
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