【摘要】 给出了确定差分格式逼近阶的原则，利用待定系数法推导出一组高精度差分格式．建立了差分解的逼近误差公式，且给出其应用．更多还原

【Abstract】 A principle for determining orders of difference schemes approach was given Highly accurate difference formulae were derived with the method of undetermined parameter Its approach error formula is proved and their application is given更多还原