从随机的数据中找出其规律性，给出其近似表达式的问题，在生产实践和科学实验中大量存在，通常利用数据的最小二乘法求得拟合曲线。 在某冶炼过程中，根据统计数据的含碳量与时间关系，求含碳量与时间t的拟合曲线。

-From random data to identify its regularity, given its approximate expression issues abound in the production practice and scientific experiments, usually using the data obtained by the method of least squares curve fitting. In a smelting process, according to the statistics of the relationship between the carbon content and the time required for the carbon content and time t curve fitting.