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[en] An approximation is proposed for energy density in two-dimensional nonideal systems for a wide class of isotropic repulsive pair interparticle potentials. The approximation allows one to determine the main thermodynamic functions and characteristics of the system by using well-known thermodynamic formulas. The results obtained with the help of this approximation are compared with the data of numerical simulations of thermodynamic properties of the structures under study. The simulations were performed in a wide range of parameters typical of laboratory dusty plasmas. Main attention was paid to the screened Coulomb potential.