11 April 2019

• 21:3421:34, 11 April 2019 diff hist +44 m 2005 JBMO Problems/Problem 4 No edit summary current
• 10:5910:59, 11 April 2019 diff hist +9 m 2005 JBMO Problems/Problem 4 No edit summary
• 10:5810:58, 11 April 2019 diff hist +14 2005 JBMO Problems/Problem 4 No edit summary
• 10:5710:57, 11 April 2019 diff hist +750 N 2005 JBMO Problems/Problem 4 Created page with "Let (a, b, c) = k Then a = pk b = qk c = rk 100a + 10b + c = abc(a + b + c) 100p + 10q + r = pqr(p + q + r)k^3 We see that if any of (a, b, c) is 0, all the terms are 0, an..."

10 April 2019

• 19:2119:21, 10 April 2019 diff hist +125 N 2005 JBMO Problems/Problem 3 Created page with "a) Draw a square. The four vertices are the first four points. The fifth point is the intersection of the square's diagonals." current
• 19:0919:09, 10 April 2019 diff hist +10 2004 JBMO Problems/Problem 3 No edit summary current
• 19:0819:08, 10 April 2019 diff hist 0 m 2004 JBMO Problems/Problem 3 No edit summary
• 19:0319:03, 10 April 2019 diff hist +321 N 2004 JBMO Problems/Problem 3 Created page with "Let 4x + 3y = a^2 3x + 4y = b^2 Then 7(x + y) = a^2 + b^2 But any perfect square can only be congruent to 0,1,2, or 4 modulo 7 Thus a = 7p b = 7q x + y = 7(p^2 + q^..."