1 . 我们要计算由抛物线
、
轴以及直线
所围成的曲边区域的面积
,可用
轴上的分点0、
、
、…、
、1将区间
分成
个小区间,在每一个小区间上作一个小矩形,使得每个矩形的左上端点都在抛物线
上,这么矩形的高分别为0、
、
、…、
、1,矩形的底边长都是
,设所有这些矩形面积的总和为
,就无限趋近于
,即
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/29/f225ce7f-2b36-4860-9093-546a431495be.png?resizew=171)
(1)求数列
的通项公式,并求出已知
;(可以利用公式
)
(2)利用上述方法,探求由函数
、
轴、
轴以及直线
和所围成的区域的面积
.(可以利用公式:
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/344ccbf79da6ad7e3709d6fa72efb756.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee6a2eba56d4f2d1670b0256b8d86b92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c350e626893ba12c028b6c8bc4ea8d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cc7040ad5dd0ebafac0e9f23bd54812.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e11f4ca0e7ace69f92130d0525bcdb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/344ccbf79da6ad7e3709d6fa72efb756.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b176553f857ff6e6641d79c9e83be10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ef7d1d8923879a6fdaf839d87aafeff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adf343294853aef9035ed93efb09ec2a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee6a2eba56d4f2d1670b0256b8d86b92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a12c3439a5339dd2ae4c91e52466f3c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/29/f225ce7f-2b36-4860-9093-546a431495be.png?resizew=171)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76a16dcc0f10910231b301311a3f4f02.png)
(2)利用上述方法,探求由函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f2eff609c6043c2a89a6dd163fe2244.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e28ccf6acba4afeb5983cc1bc575d13b.png)
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