说明：  求解积分方程,(1)使用复化Simpson方法求积分(2)使用三次样条求积分值,并比较离散解与真解之间的误差,附件有详细说明
(Solving integral equation (1) the use of complex methods for integration of Simpson (2) the use of cubic spline points for value, and compare the discrete solution and the error between true solution, is described in detail in Annex)