1 . 将杨辉三角中的每一个数
都换成分数
,就得到一个如图所示的分数三角形,称为莱布尼茨三角形,从莱布尼茨三角形可以看出:
,令
,
是
的前n项和,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04c2864e2ec3416cc4c081ac1f71a0af.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afb4fb20d3a3a67baa8505623e0bd9de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f2b94b78505bbc9a08ab0b4c3366fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f15150e25e6987b44e131991caa1d92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9abb647fd7ac1ee888183e01e554234.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04c2864e2ec3416cc4c081ac1f71a0af.png)
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