小明同学在查阅大数学家高斯的资料时,知道了高斯如何求
.小明于是对从
开始连续奇数的和进行了研究,发现如下式子:
第1个等式:
;
第2个等式:
;
第3个等式:
;
探索以上等式的规律,解决下列问题:
(1)
;
(2)完成第n个等式的填空:
;
(3)利用上述结论,计算
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c66d74ddacd376a3936706fabf015fd4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
第1个等式:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1db1c8f88c5de20586db0cde44d3e28.png)
第2个等式:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194969148c9c1b7df23d1c65f16767da.png)
第3个等式:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90c94bed97397edf43702cba40b6aec6.png)
探索以上等式的规律,解决下列问题:
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f26c63ffa335de0a9e54a779bbfa43e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/921ef5abce73648e3834140df9a72aa8.png)
(2)完成第n个等式的填空:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9afd853e8215cb0486132e473cf9667.png)
(3)利用上述结论,计算
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7dd60045dffab291246d697fb8d013c.png)
更新时间:2023-12-26 11:18:14
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解答题-计算题
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名校
【推荐2】计算:
(1)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55cfac0113c0abad36bd6c9e814d2a8f.png)
(2)
(用简便方法计算)
(3)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cf4f03064324da879f73e1a6de10d95.png)
(4)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55cfac0113c0abad36bd6c9e814d2a8f.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/575382b13d008a067da92458786e0a4b.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cf4f03064324da879f73e1a6de10d95.png)
(4)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59c289795ab39be3bcf42d4ea8e4a760.png)
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【推荐1】如图,将一张正方形纸片,剪成四个大小形状一样的小正方形,然后将其中的一个小正方形再按同样的方法剪成四个小正方形,再将其中的一个小正方形剪成四个小正方形,如此循环进行下去.
![](https://img.xkw.com/dksih/QBM/2012/8/29/1573502346199040/1573502359429120/STEM/4e8ebc6a7c4849e5aebb78956533a85b.png)
(1)填表:
(2)如果剪n次,共剪出多少个正方形?
(3)如果剪了100次,共剪出多少个正方形?
![](https://img.xkw.com/dksih/QBM/2012/8/29/1573502346199040/1573502359429120/STEM/4e8ebc6a7c4849e5aebb78956533a85b.png)
(1)填表:
剪的次数 (剪两刀记一次) | 1 | 2 | 3 | 4 | 5 | 6 |
正方形个数 | 4 | 7 |
(3)如果剪了100次,共剪出多少个正方形?
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【推荐2】观察下图,按要求回答问题(单位:
).
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/1/0b9612e7-10c1-4979-9317-85a3f7f13b6a.png?resizew=306)
(1)观察图形规律并填表;
(2)现在给这个图形涂上某种颜料,共花费648元.已知
,若这个图形中梯形的高为
,
,求这种颜料每平方厘米多少元?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efa9fbcfb9595e2f031aa691db4564b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/1/0b9612e7-10c1-4979-9317-85a3f7f13b6a.png?resizew=306)
(1)观察图形规律并填表;
梯形个数 | 1 | 2 | 3 | 4 | 5 | … | ![]() |
图形周长 | ![]() | ![]() | ![]() | … |
(2)现在给这个图形涂上某种颜料,共花费648元.已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c345907ebe27888332b1b44c666cc47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/976260cbf5e30856d4fd37a4b0a671a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06a4c76357f9b0a762a7d6961fb0367f.png)
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【推荐1】阅读材料:求
的值.
解:设![](https://staticzujuan.xkw.com/quesimg/Upload/formula/855c18ef7015646b4d0929d7731fec64.png)
将等式两边同时乘以2,得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18c491a6106c75b18516aa2e34ea0ae6.png)
将下式减去上式,得![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c558c910313e5f3fdb4a76fa8b3a482.png)
即![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c723eea8adfa95b0be9e9a86eaa10ab.png)
请你仿照此法计算:
(1)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34919db0a55b648225ad4afdbeaf3152.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b8c319a336f89b50fadb0520567de53.png)
解:设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/855c18ef7015646b4d0929d7731fec64.png)
将等式两边同时乘以2,得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18c491a6106c75b18516aa2e34ea0ae6.png)
将下式减去上式,得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c558c910313e5f3fdb4a76fa8b3a482.png)
即
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c723eea8adfa95b0be9e9a86eaa10ab.png)
请你仿照此法计算:
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34919db0a55b648225ad4afdbeaf3152.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/854dfcbc654a99dd26914c178913a167.png)
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【推荐2】观察下列各式的规律:
①
;②
;③
;…
根据上述式子的规律,解答下列问题:
(1)第④个等式为______.
(2)写出第n个等式,并验证其正确性.
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/136637ab531cfe6ecbc27b02fa1c47ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2283ce647fee0483aabb703e6b037afe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24f985831ba3fd7f1f84f784ee8869e.png)
根据上述式子的规律,解答下列问题:
(1)第④个等式为______.
(2)写出第n个等式,并验证其正确性.
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