The request appears to refer to detailed solutions or a "deep dive" (likely a "deep story" in the sense of a step-by-step narrative explanation) for the mathematics textbooks by .
: Unlike traditional methods, Peterson's system encourages children to "invent" their own solutions to problems before being given the standard formula. gdz po matematike po uchebniku l.g.peterson
Математика по Петерсон: плюсы и минусы методики - Kidskey The request appears to refer to detailed solutions
: The program moves at a fast pace and includes elements of higher mathematics early on, which is why detailed GDZ explanations are often necessary for parents to help their children. gdz po matematike po uchebniku l.g.peterson