1、对给定的若干组数据，按照指定的阶数，根据最小二乘原理分别利用正规方程方法和QR 分解方法进行多项式拟合。 2、对给定的若干组数据，求经过这些点的插值多项式。 -1, for a given number of sets of data, according to the order specified in accordance with the principle of least squares methods are the use of the normal equatio