Ryabushko A.P. IDZ 8.1 option 4

Ryabushko A.P. IDZ 8.1 option 4

Var 4 DHS 8.1 Collection Ryabushko: Not solved the problem № 12.4 typo in unige
- 13 ready-made solutions (problem solved in detail and clearly);
- Expansion of the PDF;

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