Vilenkin N. I. , Vilenkin A. N. , Survillo G. C. , Drobyshev Yu. A. , Drobysheva I. B, Kudryavtsev A. and . Textbook for general education institutions and schools with advanced study of mathematics . 9th Edition . , dorab. - M. : Education, 2010. — 303 s. : il. — ISBN 978-5-09-019502-7 . The textbook fully complies with modern educational standards, contains all the necessary text and illustrated material for studying the course on basic and in-depth programs. Contains some questions that are not yet part of the program, but are of interest for the development of mathematical thinking