[en] Contributions of quasinucleon and deep inelastic interactions into the process resulting in π⁺π^- system production in a final state in the course of interaction between 2.9 GeV/c pulse π⁺ mesons with carbon and xenon nuclei are determined. The following reactions have been investigated: π⁺+A→π⁺+π^-+p+A', π⁺+A→π⁺+π^-+kp (k>1)+A', π⁺+A→π⁺+π^-+p+mγ (m>=1)+A', and π⁺+A→π⁺+π^-+kp (k>1)+mγ (m>=1)+A'. Distributions are presented: in the missing mass square to the π⁺π^- system, π⁺π^- system energy, residual nucleus energy, residual nucleus pulse etc. The nuclear reaction yield relation with emission of π⁰ mesons and without them is determined. Criteria of polar diagram applicability are under consideration