运算log 可以通过系统自带的表达式log10(number)
log10(number) ：计算以10为底的的值。
然后用换底公式解决。
至于sai，我学疏才浅，原谅我不知道。
大明白
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RE: 如何实现sai,log等运算posted in 如何实现XXX功能？