观察理解:
,
,
,利用上述规律求![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5af59b8efec6fd611846356a3d12bcb4.png)
___________________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d842b2e150d723c948234ee36f4b6b0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b61dfa259a7cfab28fe63ff7d6211b1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7f4890678dc22224b4d23a8c38fbf11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5af59b8efec6fd611846356a3d12bcb4.png)
更新时间:2024-03-15 07:25:38
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