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1、ln<==>log
2、loga底x<==>log(x)/loga
3、lgx<==>log(x)/log10
4、pi<==>3.1415926...............
5、inf<==>无穷大
6、NaN<==>不定值。例如0/0、∞/∞、0*∞
7、e的x次方<==>exp(x)