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1 . 观察下列式子:
,
,
,…,根据以上式子可以猜想:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26db473c4177e3c20d83363e1a99408c.png)
_____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cde2d831603a48b0863bc6eddf92156.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d599661cdcf9b5f140b6f6c7b3fb77c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eaf775811fe777e39227e0f7dc657452.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26db473c4177e3c20d83363e1a99408c.png)
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2018-04-25更新
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5卷引用:四川省雅安市2018届高三下学期三诊数学(文)试题