The Alimov curriculum is a staple of Russian algebra education, and its is designed as a bridge to higher-level mathematics. If you’re looking for a review of using a GDZ (Готовые Домашние Задания) for this specific material, The Material: Alimov 7–9 Review
Treat the GDZ as a hint sheet , not a copy-paste source. Try the problem for 10 minutes first. If you’re stuck, look at the first two lines of the GDZ to get the "spark," then finish the calculation yourself.
The "bread and butter" of the OGE (ОГЭ) exam. The Role of GDZ (Solved Solutions)
Graphing and understanding properties of linear and power functions.
It acts as a private tutor when you're stuck on a complex system of equations.
Linear, quadratic, and systems of equations.
Are you preparing for the specifically, or just trying to catch up before starting the 10th-grade curriculum?
Copying solutions without understanding the "why" leads to immediate failure when the numbers are changed during a test.