Ryabushko A.P. DHS 18.2 option 7

Ryabushko A.P. DHS 18.2 option 7

Var 7 DHS 18.2 Ryabushko Collection:
Number 1 and 2 - are solved in detail and clearly;
Number 3 and 4 - fixed conditions and resolved, as specified conditions are not true.
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