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 the function f (x) is the function value of a number of points in a certain interval, the specific function to make appropriate known values ​