New exact solutions to some difference differential equations

In this paper, we use our method to solve the extended Lotka--Volterra equation anddiscrete KdV equation. With the help of Maple, we obtain a number of exact solutionsto the two equations including soliton solutions presented by hyperbolic functionsof sinh and cosh, periodic solutions presented by trigonometric functions ofsin and cos, and rational solutions. This method can be used to solve someother nonlinear difference--differential equations.