By D. Leites (ed.), G. Galperin, A. Tolpygo, P. Grozman, A. Shapovalov, V. Prasolov, A. Fomenko

From the Preface:

This is the 1st whole compilation of the issues from Moscow Mathematical Olympiads with

solutions of ALL difficulties. it's in keeping with past Russian decisions: [SCY], [Le] and [GT]. The first

two of those books include chosen difficulties of Olympiads 1–15 and 1–27, respectively, with painstakingly

elaborated ideas. The publication [GT] strives to gather formulations of all (cf. ancient feedback) problems

of Olympiads 1–49 and strategies or tricks to so much of them.

For whom is that this booklet? The luck of its Russian counterpart [Le], [GT] with their a million copies

sold will not be decieve us: a great deal of the luck is because of the truth that the costs of books, especially

text-books, have been increadibly low (< 0.005 of the bottom salary.) Our viewers might be extra limited.
However, we tackle it to ALL English-reading academics of arithmetic who may possibly recommend the e-book to their
students and libraries: we gave comprehensible ideas to ALL difficulties.

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**Additional resources for 60 Odd Years of Moscow Mathematical Olympiads**

**Sample text**

1. Given a right circular cone and a point A. Find the set of vertices of cones equal to the given parallel to that of the given one, and with A inside them. 3. 4. 2. 1. Prove that GCD(a + b, LCM (a, b)) = GCD(a, b) for any a, b. 2. A quadrilateral is circumscribed around a circle. Its diagonals intersect at the center of the circle. Prove that the quadrilateral is a rhombus. 3. , and the teeth of the last gear mesh with those of the first gear. Can the gears rotate? 4. Inside a convex 1000-gon, 500 points are selected so that no three of the 1500 points — the ones selected and the vertices of the polygon — lie on the same straight line.

Prove that so are absolute values of the roots of the quadratic equation C B + D = 0. 5. Consider the set of all 10-digit numbers expressible with the help of figures 1 and 2 only. Divide it into two subsets so that the sum of any two numbers of the same subset is a number which is written with not less than two 3’s. 1. The numbers 1, 2, . . , 49 are arranged in a square table as follows: 1 8 ... 43 2 9 ... 44 ... ... 7 14 ... 49 Among these numbers we select an arbitrary number and delete from the table the row and the column which contain this number.

2. On a plane, several points are chosen so that a disc of radius 1 can cover every 3 of them. Prove that a disc of radius 1 can cover all the points. 3. Find nonzero and nonequal integers a, b, c so that x(x − a)(x − b)(x − c) + 1 factors into the product of two polynomials with integer coefficients. 4. Solve in integers the equation x + y = x2 − xy + y 2 . 5. Given two skew perpendicular lines in space, find the set of the midpoints of all segments of given length with the endpoints on these lines.

### 60 Odd Years of Moscow Mathematical Olympiads by D. Leites (ed.), G. Galperin, A. Tolpygo, P. Grozman, A. Shapovalov, V. Prasolov, A. Fomenko

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