题目：有一分数序列：2/1，3/2，5/云计3，8/5，13/8，21/13...求出这个数列算开的前20项之和。
程序分析：请抓住分子与分发：母的变化规律。
程序源代码：
方法一：
方法二：
方法三Py：
以上实例输出结果为：
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