Let's work a quick example. This example will use many of the properties and facts from the brief review of summation notation in the Extras chapter.
Let's work a quick example. This example will use many of the properties and facts from the brief review of summation notation in the Extras chapter.
让我们快速做一个例子，简单回顾一下我们从别的章节总结出的许多的结论和数据，这个例子将会用到他们。