猜猜是什么？
其实都是我的生日～上面那个是1991.0209（实际上是1991.0208793434240034），下面那个是0.199129（实际上是0.19912798044674601375）
怎么做到的？见http://ddrive.cs.dal.ca/~isc/standard.html
还有好多呢。。。
两个式子
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