Difference between revisions of "1968 IMO Problems"
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Let <math>f</math> be a real-valued function defined for all real numbers <math>x</math> such that, for some positive constant <math>a</math>, the equation | Let <math>f</math> be a real-valued function defined for all real numbers <math>x</math> such that, for some positive constant <math>a</math>, the equation | ||
− | <cmath>f(x + a) = \frac{1}{2} + \sqrt{f(x) - | + | <cmath>f(x + a) = \frac{1}{2} + \sqrt{f(x) - (f(x))^2}</cmath> |
holds for all <math>x</math>. | holds for all <math>x</math>. | ||
Revision as of 14:08, 26 April 2012
Problems of the 10th IMO 1968 in USSR.
Problem 1
Prove that there is one and only one triangle whose side lengths are consecutive integers, and one of whose angles is twice as large as another.
Problem 2
Find all natural numbers such that the product of their digits (in decimal notation) is equal to .
Problem 3
Consider the system of equations with unknowns where are real and . Let . Prove that for this system
(a) if , there is no solution,
(b) if , there is exactly one solution,
(c) if , there is more than one solution.
Problem 4
Prove that in every tetrahedron there is a vertex such that the three edges meeting there have lengths which are the sides of a triangle.
Problem 5
Let be a real-valued function defined for all real numbers such that, for some positive constant , the equation holds for all .
(a) Prove that the function is periodic (i.e., there exists a positive number such that for all ).
(b) For , give an example of a non-constant function with the required properties.
Problem 6
For every natural number , evaluate the sum (The symbol denotes the greatest integer not exceeding .)