# User contributions

(newest | oldest) View (newer 50 | older 50) (20 | 50 | 100 | 250 | 500)

- 20:11, 20 November 2009 (diff | hist) . . (-448) . . User:Xpmath (Undo revision 32960 by Thunder365 (Talk)) (current)
- 12:15, 16 July 2009 (diff | hist) . . (-86) . . User:Xpmath (→Goals for 9th grade)
- 11:45, 16 July 2009 (diff | hist) . . (+397) . . N 1965 IMO Problems/Problem 6 (Created page with '== Problem == In a plane a set of <math>n</math> points (<math>n\geq 3</math>) is given. Each pair of points is connected by a segment. Let <math>d</math> be the length of the lo…')
- 11:44, 16 July 2009
(diff | hist) . .
**(+537)** . . N 1965 IMO Problems/Problem 5 (Created page with '== Problem == Consider <math>\triangle OAB</math> with acute angle <math>AOB</math>. Through a point <math>M \neq O</math> perpendiculars are drawn to <math>OA</math> and <math>O…') - 11:44, 16 July 2009 (diff | hist) . . (+240) . . N 1965 IMO Problems/Problem 4 (Created page with '== Problem == Find all sets of four real numbers <math>x_1</math>, <math>x_2</math>, <math>x_3</math>, <math>x_4</math> such that the sum of any one and the product of the other …')
- 11:43, 16 July 2009
(diff | hist) . .
**(+668)** . . N 1965 IMO Problems/Problem 3 (Created page with '== Problem == Given the tetrahedron <math>ABCD</math> whose edges <math>AB</math> and <math>CD</math> have lengths <math>a</math> and <math>b</math> respectively. The distance be…') - 11:43, 16 July 2009
(diff | hist) . .
**(+635)** . . N 1965 IMO Problems/Problem 2 (Created page with '== Problem == Consider the system of equations <cmath>a_{11}x_1 + a_{12}x_2 + a_{13}x_3 = 0</cmath> <cmath>a_{21}x_1 + a_{22}x_2 + a_{23}x_3 = 0</cmath> <cmath>a_{31}x_1 + a_{32}…') - 11:42, 16 July 2009 (diff | hist) . . (-1) . . 1965 IMO Problems/Problem 1
- 11:41, 16 July 2009 (diff | hist) . . (+250) . . N 1965 IMO Problems/Problem 1 (Created page with '== Problem == Determine all values <math>x</math> in the interval <math>0\leq x\leq 2\pi </math> which satisfy the inequality <cmath>2\cos x \leq \left| \sqrt{1+\sin 2x} - \sqrt{…')
- 11:40, 16 July 2009 (diff | hist) . . (+1) . . 1964 IMO Problems/Problem 6 (→Problem)
- 11:39, 16 July 2009 (diff | hist) . . (+13) . . 1964 IMO Problems/Problem 6 (→Solution)
- 11:39, 16 July 2009 (diff | hist) . . (+13) . . 1964 IMO Problems/Problem 5 (→Solution)
- 11:38, 16 July 2009 (diff | hist) . . (+13) . . 1964 IMO Problems/Problem 4 (→Solution)
- 11:38, 16 July 2009 (diff | hist) . . (+13) . . 1964 IMO Problems/Problem 3 (→Solution)
- 11:37, 16 July 2009 (diff | hist) . . (+13) . . 1964 IMO Problems/Problem 2 (→Solution)
- 19:36, 15 July 2009
(diff | hist) . .
**(+597)** . . N 1964 IMO Problems/Problem 6 (Created page with '== Problem == In tetrahedron <math>ABCD</math>, vertex <math>D</math> is connected with <math>D_0</math>, the centrod of <math>\triangle ABC</math>. Lines parallel to <math>DD_0<…') - 19:35, 15 July 2009 (diff | hist) . . (+338) . . N 1964 IMO Problems/Problem 5 (Created page with '== Problem == Suppose five points in a plane are situated so that no two of the straight lines joining them are parallel, perpendicular, or coincident. From each point perpendicu…')
- 19:34, 15 July 2009 (diff | hist) . . (+326) . . N 1964 IMO Problems/Problem 4 (Created page with '== Problem == Seventeen people correspond by mail with one another - each one with all the rest. In their letters only three different topics are discussed. Each pair of correspo…')
- 19:34, 15 July 2009 (diff | hist) . . (+407) . . N 1964 IMO Problems/Problem 3 (Created page with '== Problem == A circle is inscribed in a triangle <math>ABC</math> with sides <math>a,b,c</math>. Tangents to the circle parallel to the sides of the triangle are contructed. Eac…')
- 19:33, 15 July 2009 (diff | hist) . . (+158) . . N 1964 IMO Problems/Problem 2 (Created page with '== Problem == Suppose <math>a, b, c</math> are the sides of a triangle. Prove that <cmath>a^2(b+c-a)+b^2(c+a-b)+c^2(a+b-c)\le{3abc}.</cmath> == Solution ==')
- 19:31, 15 July 2009 (diff | hist) . . (+6) . . 1964 IMO Problems (Undo revision 32320 by Xpmath (Talk))
- 19:31, 15 July 2009 (diff | hist) . . (+6) . . 1964 IMO Problems (Undo revision 32321 by Xpmath (Talk))
- 19:30, 15 July 2009 (diff | hist) . . (-6) . . 1964 IMO Problems (→Day II)
- 19:29, 15 July 2009 (diff | hist) . . (-6) . . 1964 IMO Problems (→Day I)
- 19:29, 15 July 2009 (diff | hist) . . (+476) . . 1964 IMO Problems/Problem 1 (→Solution)
- 19:16, 15 July 2009 (diff | hist) . . (+257) . . N 1964 IMO Problems/Problem 1 (Created page with '== Problem == (a) Find all positive integers <math>n</math> for which <math>2^n-1</math> is divisible by <math>7</math>. (b) Prove that there is no positive integer <math>n</mat…')
- 19:13, 15 July 2009
(diff | hist) . .
**(+2,507)** . . N 1964 IMO Problems (Created page with 'Problems of the 6th IMO 1964 in USSR. == Day I == === Problem 1 === (a) Find all positive integers <math>n</math> for which <math>2^n-1</math> is divisible by <math>7</math…') - 09:52, 5 July 2009 (diff | hist) . . (-4) . . User:Xpmath (→Stuff to do during summer)
- 09:51, 5 July 2009 (diff | hist) . . (+22) . . User:5849206328x
- 12:15, 7 June 2009 (diff | hist) . . (-219) . . User:Xpmath (→To Do List)
- 12:14, 7 June 2009 (diff | hist) . . (-100) . . User:Xpmath (→Minor Goals for 8th grade)
- 12:13, 7 June 2009 (diff | hist) . . (-370) . . User:Xpmath (→Major Goals for 8th Grade)
- 12:12, 7 June 2009 (diff | hist) . . (-139) . . User:Xpmath (→Eighth Grade)
- 12:11, 7 June 2009 (diff | hist) . . (+72) . . User:Xpmath (→Major Goals for 8th Grade)
- 13:40, 9 April 2009 (diff | hist) . . (+140) . . User:Xpmath (→Major Goals for 8th Grade)
- 21:19, 4 April 2009 (diff | hist) . . (+5) . . User:Xpmath (→Major Goals for 8th Grade)
- 21:19, 4 April 2009 (diff | hist) . . (+28) . . User:Xpmath (→Minor Goals for 8th grade)
- 21:18, 4 April 2009 (diff | hist) . . (+10) . . User:Xpmath (→Major Goals for 8th Grade)
- 12:48, 15 March 2009 (diff | hist) . . (+62) . . User:Xpmath (→Eighth Grade)
- 16:32, 27 February 2009 (diff | hist) . . (+14) . . User:Xpmath (→Minor Goals for 8th grade)
- 16:32, 27 February 2009 (diff | hist) . . (+25) . . User:Xpmath (→Major Goals for 8th Grade)
- 17:43, 20 February 2009 (diff | hist) . . (-1) . . User:Xpmath (→Minor Goals for 8th grade)
- 17:06, 11 February 2009 (diff | hist) . . (+4) . . User:Xpmath (→Major Goals for 8th Grade)
- 18:42, 24 January 2009 (diff | hist) . . (-3) . . 2003 AMC 10A Problems/Problem 3 (→Solution)
- 19:53, 16 January 2009 (diff | hist) . . (+8) . . User:Xpmath (→The Problem Solver's Resource To Do List)
- 12:44, 11 January 2009 (diff | hist) . . (+294) . . User:Temperal/The Problem Solver's Resource6 (current)
- 12:40, 11 January 2009 (diff | hist) . . (+33) . . User:Xpmath (→The Problem Solver's Resource To Do List)
- 11:47, 11 January 2009 (diff | hist) . . (+205) . . User:Temperal/The Problem Solver's Resource6 (→Properties)
- 11:46, 11 January 2009 (diff | hist) . . (+67) . . User:Xpmath (→Minor Goals for 8th grade)
- 11:45, 11 January 2009 (diff | hist) . . (+64) . . User:Xpmath (→Eighth Grade)

(newest | oldest) View (newer 50 | older 50) (20 | 50 | 100 | 250 | 500)