[en] Investigated are inclusive spectra of neutral strange particles produced in pion-nucleus interactions. The experiment is carried out at the 105 cm freon bubble chamber (C, F, Cl, anti A = 22.3 nuclei) irradiated by π^- mesons with momentum of 3.9 GeV/c. Selected were the events, corresponding to inclusive reactions π^-A → Λ + X, π^-A → K⁰+X. The strange particles were identified according to the decays Λ → π^-+p, K⁰₁ → π⁺ + π^-. The conclusion was made that the Feynman scaling for Λ -hyperons produced in pion-nucleon and pion-nucleus interactions is observed in the region -0.6 < x < 0.6 (where x is the Feynman variable) with the primary pion momentum of 3.9 GeV/c. The nucleus scaling effect is confirmed in pion-nucleus interactions with the Λ-hyperon escape in the angle region kinematically forbidden for the production on a free nucleon