龙贝格算法实现，并通过具体实例函数进行说明。可以自己修改实例函数，并设置积分下限、积分上限、积分结束精度、运算最大次数等参量。-Romberg algorithm, and illustrated by specific examples of functions. You can modify their own instance of the function and set the lower limit of integration, integration limit, precision end integration, operation parameters such as the maximum number of times.