User contributions for Yimingz89
19 February 2018
- 19:0119:01, 19 February 2018 diff hist −1 2017 AIME I Problems/Problem 15 →Solution 4
- 18:5618:56, 19 February 2018 diff hist +2 2017 AIME I Problems/Problem 15 →Solution 4
- 18:5418:54, 19 February 2018 diff hist +1,329 2017 AIME I Problems/Problem 15 No edit summary
28 November 2015
31 July 2015
3 May 2015
- 19:5719:57, 3 May 2015 diff hist +230 N 2004 IMO Shortlist Problems/A5 Created page with "== Problem == If <math>a,b,c</math> are three positive real numbers such that <math>ab+bc+ca=1</math>, prove <math><cmath> \sqrt[3]{\frac{1}{a}+6b}+\sqrt[3]{\frac{1}{b}+6c}+\s..."
20 April 2015
- 08:5908:59, 20 April 2015 diff hist +545 Mock AIME 4 2006-2007 Problems/Problem 12 No edit summary
15 April 2015
- 15:3315:33, 15 April 2015 diff hist +767 N Mock AIME 1 2013 Problems/Problem 6 Created page with "==Problem== Find the number of integer values <math>k</math> can have such that the equation <math>7\cos x+5\sin x=2k+1</math> has a solution. ==Solution== <math>2k+1</math> ..." current
27 March 2015
23 March 2015
- 14:4114:41, 23 March 2015 diff hist −321 2015 AIME I Problems/Problem 13 →Solution
- 14:4014:40, 23 March 2015 diff hist +321 2015 AIME I Problems/Problem 13 →Solution
22 March 2015
- 18:4618:46, 22 March 2015 diff hist +77 N 1953 AHSME Problems/Problem 45 Created page with "By AM-GM, the answer is <math>\textbf{(E)}\ \frac{a+b}{2}\geq\sqrt{ab}</math>"
- 18:4518:45, 22 March 2015 diff hist −78 1953 AHSME Problems →Problem 45
- 18:4518:45, 22 March 2015 diff hist −40 1953 AHSME Problems →Problem 45
- 18:4418:44, 22 March 2015 diff hist +78 1953 AHSME Problems →Problem 45
15 February 2015
- 22:3922:39, 15 February 2015 diff hist +1 Mock AIME 3 2006-2007 Problems/Problem 11 →Problem
- 22:3822:38, 15 February 2015 diff hist +14 Mock AIME 3 2006-2007 Problems/Problem 3 →Solution current
- 22:3522:35, 15 February 2015 diff hist +342 Mock AIME 3 2006-2007 Problems/Problem 4 →Solution current
- 22:2922:29, 15 February 2015 diff hist +261 N Mock AIME 3 2006-2007 Problems/Problem 4 Created page with "== Problem == Let <math>x=(i-11)(i-10)....(i+8)(i+9)</math> where <math>i=\sqrt{-1}</math>. If <math>a</math> and <math>b</math> are positive integers such that <math>x(a-bi)</ma..."
- 19:5219:52, 15 February 2015 diff hist +755 N Mock AIME 3 2006-2007 Problems/Problem 3 Created page with " == Problem == Let <math>P(x) = 2x^{59} - x^2 - x - 6</math>. If <math>Q(x)</math> is a polynomial whose roots are the 59th powers of the roots of <math>P(x)</math>, then find t..."
- 19:4819:48, 15 February 2015 diff hist +964 Mock AIME 3 2006-2007 Problems/Problem 8 →Solution current
- 19:3919:39, 15 February 2015 diff hist +17 Mock AIME 3 2006-2007 Problems/Problem 8 →Problem
- 19:3919:39, 15 February 2015 diff hist +495 N Mock AIME 3 2006-2007 Problems/Problem 8 Created page with "== Problem == A cube has vertices <math>(0,0,0), (0,0,1), (0,1,0), (0,1,1), (1,0,0), (1,0,1), (1,1,0)</math>, and <math>(1,1,1)</math>. At <math>t=0</math>, a particle is at <ma..."
- 19:3119:31, 15 February 2015 diff hist −4 Mock AIME 3 2006-2007 Problems/Problem 11 →Solution
- 19:3119:31, 15 February 2015 diff hist −5 Mock AIME 3 2006-2007 Problems/Problem 11 →Problem
- 19:3019:30, 15 February 2015 diff hist +190 m Mock AIME 3 2006-2007 Problems/Problem 11 No edit summary
- 19:2719:27, 15 February 2015 diff hist +769 N Mock AIME 3 2006-2007 Problems/Problem 11 Created page with "Factoring the LHS gives <math>2x(x+y)=6+x^2+y^2</math>. Now converting to polar: <math>2r\cos(a)(r\cos(a)+r\sin(a))=6+r^2</math> <math>2\cos(a)(\cos(a)+\sin(a))=\frac{6}{r^2}+1..."
8 February 2015
- 16:1916:19, 8 February 2015 diff hist 0 Mock AIME 2 2006-2007 Problems/Problem 11 →See Also
- 16:1916:19, 8 February 2015 diff hist +80 Mock AIME 2 2006-2007 Problems/Problem 11 →See Also
