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Dynamical charge structure factor $N(Q,\omega)$ with $Q$ smaller than theFermi wave number is derived analytically for the one-dimensionalsupersymmetric t-J model with $1/r^2$ interaction. Strong spin-chargeseparation in dynamics is found. $N(Q,\omega)$ with given electron density doesnot depend on the spin polarization for arbitrary size of the system. In thethermodynamic limit, only two holons and one antiholon contribute to$N(Q,\omega)$. These results together with generalized ones for the SU($K$,1)supersymmetric t-J model are derived via solution of the Sutherland model inthe strong coupling limit.Comment: 4 pages (revtex

Exact Charge Dynamics in the Supersymmetrict-JModel with Inverse-Square Interaction