Exercises frequently combine different areas of study—for instance, a task might require morphemic analysis (breaking down a word) alongside a grammar exercise, helping students see the language as a unified system.
The "helpful feature" you're looking for regarding A.V. Polyakova's 4th-grade Russian language textbook—which is a core part of the L.V. Zankov developmental learning system—is its focus on . uchebnik po russkomu iazyku poliakova 4 klass uprazhnenie
Unlike traditional textbooks that present rules first, Polyakova’s exercises are designed to let students "discover" linguistic patterns for themselves through several distinct features: uchebnik po russkomu iazyku poliakova 4 klass uprazhnenie
система развивающего обучения л. в. занкова uchebnik po russkomu iazyku poliakova 4 klass uprazhnenie