Search found 6 matches
- Tue Jan 25, 2011 7:37 pm
- Forum: Divisional Math Olympiad
- Topic: A Problem
- Replies: 4
- Views: 3475
A Problem
x + 1/x = 6 . Find x .
- Tue Jan 25, 2011 7:26 pm
- Forum: Secondary: Solved
- Topic: Dhaka Secondary 2009/11
- Replies: 4
- Views: 4731
Re: Dhaka Secondary 2009/11
The k is 2009 .
- Tue Jan 25, 2011 7:23 pm
- Forum: Secondary: Solved
- Topic: Dhaka Secondary 2009/9
- Replies: 10
- Views: 15732
Re: Dhaka Secondary 2009/9
100 . Because there are 100 players who will play with each other . The question is not how many match played but how many player play all the match.
- Tue Jan 25, 2011 7:15 pm
- Forum: Secondary: Solved
- Topic: Dhaka Secondary 2009/2
- Replies: 6
- Views: 10783
Re: Dhaka Secondary 2009/2
D = 2 . Because DBC = 276
- Tue Jan 25, 2011 7:10 pm
- Forum: Secondary: Solved
- Topic: Dhaka Secondary 2010/6
- Replies: 7
- Views: 5490
Re: Dhaka Secondary 2010/6
There is an only number which is 3 and 3+1 is a sqare .
- Tue Jan 25, 2011 7:00 pm
- Forum: Secondary: Solved
- Topic: Dhaka Secondary 2010/1
- Replies: 2
- Views: 3302
Re: Dhaka Secondary 2010/1
Suppose , the numbers are ( 1 -x ) and (1+ x)
so,
=>(1-x)(1+x) = 3 .
=>1 -x^2 = 3
=>-x^2 = 2
=> x^2 = -2
=> x = root(-2)
so, the numbers are (1-root(-2)) and (1+root(-2)) . Now its so easy .
so,
=>(1-x)(1+x) = 3 .
=>1 -x^2 = 3
=>-x^2 = 2
=> x^2 = -2
=> x = root(-2)
so, the numbers are (1-root(-2)) and (1+root(-2)) . Now its so easy .