Search found 190 matches
- Mon Apr 16, 2012 7:46 am
- Forum: Number Theory
- Topic: Find all the solutiuons
- Replies: 9
- Views: 4853
Find all the solutiuons
Find all the solution $ \phi (x) = \phi (100-x) $.
- Mon Apr 16, 2012 7:42 am
- Forum: Secondary Level
- Topic: Find The Remainder
- Replies: 2
- Views: 2396
Re: Find The Remainder
Use fi function .
- Wed Apr 11, 2012 8:12 am
- Forum: Geometry
- Topic: Geometric inequality
- Replies: 0
- Views: 1372
Geometric inequality
Prove that in any triangle ABC, there is inequality.
$ \sum \frac{a(a+2bcos\frac{A}{2})}{b+c}\sum \frac{a(b+c)}{a+2bcos\frac{A}{2}}<\frac{25p^{2}}{4} $
where p=(a+b+c)/2 .
$ \sum \frac{a(a+2bcos\frac{A}{2})}{b+c}\sum \frac{a(b+c)}{a+2bcos\frac{A}{2}}<\frac{25p^{2}}{4} $
where p=(a+b+c)/2 .
- Tue Apr 10, 2012 1:25 pm
- Forum: Combinatorics
- Topic: How many numbes (Self-made )
- Replies: 5
- Views: 4290
How many numbes (Self-made )
How many numbers are there from $1$ to $10000$ which are perfect powers of only $2$ & $3$.
Example: form $1$ to $10$ the number is $7$. They are $1,2,3,4,6,8,9$.
Example: form $1$ to $10$ the number is $7$. They are $1,2,3,4,6,8,9$.
- Mon Apr 02, 2012 8:01 am
- Forum: Social Lounge
- Topic: Chess forum
- Replies: 7
- Views: 5980
Re: Chess forum
Yahoo!!! I like chess problem solving a lot .. Quick start the sub-forum ,.
- Tue Mar 27, 2012 1:13 am
- Forum: Chemistry
- Topic: Electronic configaration of Palladium
- Replies: 0
- Views: 7873
Electronic configaration of Palladium
Palladium এর ইলেকট্রন বিন্যাস আউফবাউ নীতি মানে না ।। এমনকি , অর্ধপূর্ণ , পূর্ণপূর্ণ নীতিও মানে না । তাহলে , এই ইলেকট্রন বিন্যাস কিভাবে হল ??
http://en.wikipedia.org/wiki/Palladium
http://en.wikipedia.org/wiki/Palladium
- Wed Mar 21, 2012 1:38 pm
- Forum: Social Lounge
- Topic: The worst day
- Replies: 8
- Views: 5725
Re: The worst day
এবার ক্যাম্প থেকে ফিরে মনটা খুব খারাপ লাগছে ... প্রতিবারই লাগে।। কিন্তু , এত বেশি না ।। কেন ?? জানি না ...
- Thu Mar 08, 2012 10:48 am
- Forum: Geometry
- Topic: conditions for concurrence
- Replies: 2
- Views: 2413
Re: conditions for concurrence
1.Ceva.
2.Desargues' theorem .
3
2.Desargues' theorem .
3
- Thu Mar 08, 2012 9:08 am
- Forum: Geometry
- Topic: condition for collinear
- Replies: 1
- Views: 1776
Re: condition for collinear
1. angle chase .
2. Menelaus.
3.Desargues' theorem .
4.
2. Menelaus.
3.Desargues' theorem .
4.
- Thu Mar 08, 2012 9:05 am
- Forum: Geometry
- Topic: conditions for concurrence
- Replies: 2
- Views: 2413
conditions for concurrence
This post is for posting the conditions for concurrence . In math Olympiads, we often face the problems where we need to prove some lines are concurrent . Here , we will write conditions for concurrence . Thus, we can get all the conditions for concurrence . I am starting below. Members are requeste...