利用复化梯形公式、 Newton-Cotes公式 、 Romberg公式进行积分数值计算，将计算结果与精确值比较。给出实例，并编写程序，给出结论。-Rehabilitation of the use of trapezoidal rule, Newton-Cotes formulas, Romberg numerical integration formula, the calculation results compared with the accurate value. Examples are given, and the preparation of procedures, the conclusions are given.