用什么软件能实现呢

I would suggest you look at Chapter 2, Monte Carlo Statistical Methods. Springer, New York, Robert, C. P., Casella, G. (1999),The authors describe a number of techniques that you may find useful.

The most common one is setting a=b=1 and using a Box-Muller transformation

找到计算的方法了，谢谢

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