插值法利用函数f (x)在某区间中若干点的函数值，作出适当的特定函数，在这些点上取已知值，在区间的其他点上用这特定函数的值作为函数f (x)的近似值-Interpolation method using function f (x) in a certain interval in some point of function value, the appropriate specific function, in these points from the given value, in th