  A field-theoretic approach is applied to describe behavior of
three-dimensional, weakly disordered, elastically isotropic, compressible
systems with long-range interactions at various values of a long-range
interaction parameter. Renormalization-group equations are analyzed in the
two-loop approximation by using the Pade-Borel summation technique. The fixed
points corresponding to critical and tricritical behavior of the systems are
determined. Elastic deformations are shown to changes in critical and
tricritical behavior of disordered compressible systems with long-range
interactions. The critical exponents characterizing a system in the critical
and tricritical regions are determined.
