![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ce5aab76510615e2621b703c7d5fee9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00a6d4bba33d4275193e52018ed58f5e.png)
更新时间:2020-06-26 19:23:08
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【知识点】 分组(并项)法求和
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【推荐1】求和:Sn=1+
+
+1+
+
+
+…+
=________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c20b0f3d82016db8765c7a862ff568fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f16ede2af6d5140a992c29f08cab7935.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d266a04f3dc7483eddbc26c5e487db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ca8b26c3ad6d892590290a2304126bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b85863866c58dcbb233d6f3b31f76bbe.png)
您最近一年使用:0次
【推荐2】已知数列
通项公式
,则数列
的前
项和为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80294b15780d139fd00ad7d630b196a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8d02ea8c4988c5c28ab93f0d70fb55a.png)
您最近一年使用:0次