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#251 Puzzles and Games » prove » 2007-12-16 11:12:51
- tony123
- Replies: 7
#252 Help Me ! » sum of n terms » 2007-12-11 07:29:56
- tony123
- Replies: 4
Find the sum of n terms of the series
1 + 8 + 19 + 34 + 53 + 76 + ------
#253 Help Me ! » ten dollars » 2007-12-11 07:26:41
- tony123
- Replies: 3
A man and a boy agree to dig a patch of potatoes for ten dollars. The man can dig as fast as the boy can pull tops, and he can pull tops twice as fast as the boy can dig. How should the money be divided?
#254 Puzzles and Games » the smallest value » 2007-12-08 09:21:57
- tony123
- Replies: 1
find the smallest value of
#255 Puzzles and Games » sin x » 2007-12-06 13:09:10
- tony123
- Replies: 2
prove that
sin x≥ 2 x/ pi , x ∈ [0, pi/2]
#256 Puzzles and Games » inequality » 2007-12-06 05:07:16
- tony123
- Replies: 0
Prove that if
,
then.
#257 Puzzles and Games » Solve the following equation » 2007-12-06 04:52:47
- tony123
- Replies: 2
Solve the following equation on the set of real numbers:
#258 Puzzles and Games » hard » 2007-12-04 09:50:54
- tony123
- Replies: 1
If
andare lengths of a triangle such that
Prove that
#259 Re: Puzzles and Games » Solve » 2007-12-04 05:55:40
this is other way
----1
from 1
#260 Re: Puzzles and Games » atriangle » 2007-12-04 05:36:35
I am sorry for all This large error
you are right jane 4S √3 ≥ a²+b²+c² is not right
4S √3 ≤ a²+b²+c² this is is right
A pologise
#261 Puzzles and Games » Solve » 2007-12-03 22:15:23
- tony123
- Replies: 4
SOLVE
a,b integers
#262 Puzzles and Games » atriangle » 2007-12-03 21:13:03
- tony123
- Replies: 15
if atriangle has sides of length a,band c, and the area is S
prove that
4S √3 ≥ a²+b²+c²
with equality holding if and only if the triangle is equilateral
#263 Re: Help Me ! » the sum of the series » 2007-12-03 20:52:29
JaneFairfax
wonderful Solution
You are right
Next time I shall problem in “Puzzles and Games”
#264 Help Me ! » easy2 » 2007-12-03 06:42:23
- tony123
- Replies: 4
find the roots
#265 Re: Help Me ! » the sum of the series » 2007-12-02 06:36:29
1,2,4,8,16 yes
1,2,4,6 how olivia
#266 Help Me ! » the sum of the series » 2007-12-02 05:35:50
- tony123
- Replies: 5
For x>1 determine the sum of the series
#267 Help Me ! » rectangular » 2007-12-01 21:29:35
- tony123
- Replies: 2
X∈BC , Y∈CD and
find
#268 Help Me ! » the last four digits » 2007-12-01 08:56:16
- tony123
- Replies: 2
what is the last four digits for
#269 Help Me ! » square PQRS » 2007-12-01 05:02:47
- tony123
- Replies: 5
Inside the unique square PQRS are drawn the 4 quarter-circles having unit radii and the vertices as centers. Determine the area A that is common to the 4 quadrants.
#270 Re: Help Me ! » lim » 2007-12-01 04:40:44
Welcome Youth
I have three other solutions to this problem
There is one other forums which he introduced this solution
To discuss this solution
And try to acquire other ideas
JaneFairfax im not a charlatan
Krizalid im not stole but i have three other solutions to this problem
Thank you for all
#271 Re: Help Me ! » lim » 2007-11-30 10:39:19
Thus,
#272 Help Me ! » easy » 2007-11-30 10:32:20
- tony123
- Replies: 1
prove
#273 Help Me ! » lim » 2007-11-25 07:37:05
- tony123
- Replies: 12
without l hopetal
find
when x-->0
#274 Help Me ! » maximum? » 2007-11-24 07:39:25
- tony123
- Replies: 1
For what real values of x will the value of the expression
be a maximum?
#275 Help Me ! » F(1000)? » 2007-11-24 07:18:49
- tony123
- Replies: 1
Let N = { 0, 1, 2, 3, ... } and suppose F: N --> Z+ is defined by: F(0) = 0 ; F(1) = 1 ;F(n) = 18F(n – 1) – 65F(n – 2), for all n = 2, 3, 4, ... What is F(1000)?