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The textbook is a didactic material on algebra for the 9th grade of secondary schools. It is an integral part of the teaching and methodological kit and corresponds to the algebra textbook for grade 9 (authors A. Merzlyak, V. Polonsky, M. Yakir). The book contains about 1000 problems. The first part, "Training Exercises", is divided into three similar versions of 261 problems each. The second part contains tests (two versions) for thematic assessment of pupils' learning achievements on a 12-point scale in accordance with the current mathematics curriculum. For teachers of secondary schools and 9th grade students.