如何使用扩展精度运算处理更大的阶乘？
How to use extended precision arithmetic to handle bigger factorials?
尽量尝试将您的扩展函数设计为仅使用双精度、字符串、布尔和节点集作为实参和返回值的类型。
Try to design your extension functions so that they use only doubles, strings, booleans, and node-sets as both arguments and return values.
该系统具有控制精度高、功能扩展能力强以及使用方便等特点，已在临床推广应用。
The system has the advantages of high precision, extending power and easy manipulation. It has been used in the clinical anesthesia.
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