[en] By numerical integration of the corresponding equations the adiabatic energies of the basic state for 16 three-particle systems composed of various combinations of electron or muon with proton, deuteron and triton are calculated. According to the Bratsev theorem two adiabatic lower energy bounds of each system are determined. The first one corresponds to the realization of adiabatic separation of variables before separation of the mass centre motion, the second one - to adiabatic separation of variables during preliminary separation of the mass centre. Bounds obtained in the second case are more (2-3 times) precise than the bounds calculated for the first case. It testifies to a considerable dependence of adiabatic energy lower bounds on concrete selection of coordinates and it gives possibilities for their further refining. On the basis of analysis of both adiabatic energy bounds on particle mass the possibility to predict precise (ⁿon-adiabatic⁾ energies according to purely adiabatic calculations in the systems studied is established