e值该如何计算呢? 若关于ex幂级数展开 ex=1+x+x2/2!+x3/3!+•••+xn/n! 取x=1,有e=1+1/2+1/6+••• 接下来就是十分简单的编程 这里选用了python语言(当然也可以选用其他编程语言)进行计算 import time e=1 #e bn=1 since = time.time() for i in range(100000): bn=bn*(i+1) #n! e=e+1/bn spend = time.time()-since print(e) prin
***设置超链接的样式示例 a:link 超链接被点前状态 a:visited 超链接点击后状态 a:hover 悬停在超链接时 a:active 点击超链接时 在定义这些状态时,有一个顺序l v h a 代码区: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"&g
//Instantiating a Workbook object Workbook workbook = new Workbook(); //Adding a new worksheet to the Workbook object int i = workbook.Worksheets.Add(); //Obtaining the reference of the newly added worksheet by passing its sheet index Worksheet works