观察下列等式,探究其中的规律并解答问题:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1db1c8f88c5de20586db0cde44d3e28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1d4fd766978103211c9ba193587d560.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b7df6acbe5e9618d14d66cad2bbceaa.png)
.
……
(1)第4个等式中,
______;
(2)第n个等式为:______(其中n为正整数).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1db1c8f88c5de20586db0cde44d3e28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1d4fd766978103211c9ba193587d560.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b7df6acbe5e9618d14d66cad2bbceaa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db56ba3c5d107d9e05a664eae7b983ea.png)
……
(1)第4个等式中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd707b69a11f8de5566f23c1a2a9ff5a.png)
(2)第n个等式为:______(其中n为正整数).
更新时间:2023-12-10 20:05:22
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解答题-问答题
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【推荐1】如图,用一些完全相同的正五边形纸片依次“粘连”成一条纸带,探究纸片张数
与纸带周长l的关系.设每个正五边形的边长为1.
根据以上图表规律,解答下列问题:
(1)表格中“?”处应填写______;当
时,
______;
(2)纸带周长可能等于2025吗?请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
纸片张数![]() | 1 | 2 | 3 | 4 | 5 | … |
纸带周长![]() | 5 | 8 | 11 | 14 | ? | … |
(1)表格中“?”处应填写______;当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe08722cf9300fe188dbbb71989c06c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/050294162a78c6f4d6a87849bd3049a3.png)
(2)纸带周长可能等于2025吗?请说明理由.
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名校
【推荐2】细心观察下列图形,认真分析各式,然后解答问题:s1,s2, s3,…表示各个三角形的面积
OA22=
;
OA32=12+
;
OA42=12+
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f4f48b72329a258cf2c82273574a208.png)
…… ……
(1)推算出OA10的长.
(2) 请用含有n(n是正整数)的等式表示上述的两个变化规律.
(3)若一个三角形的面积是
,通过计算说明它是第几个三角形?
OA22=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bc07a492f6f03f32c4f85fc8a7cf8bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f4f48b72329a258cf2c82273574a208.png)
OA32=12+
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82af3506bb8ad6425f9a87df6dc63fae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/554a870ba0c66752f89e00ae26cc7646.png)
OA42=12+
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2f45cef6ea514ffb1472031e55b02e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f4f48b72329a258cf2c82273574a208.png)
…… ……
(1)推算出OA10的长.
(2) 请用含有n(n是正整数)的等式表示上述的两个变化规律.
(3)若一个三角形的面积是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2967337e3fcb228dded64ab0c41a17e0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/28/ddfee306-e1ea-4b8e-b346-da723e0a56c4.png?resizew=233)
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解答题-计算题
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【推荐1】求
的值,直接求较困难,因为
是一个非常大的数.因此,我们用解方程的方法来求解.
解:设
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a71692850542676cb0daefc66064c59e.png)
即
②
②
①得:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47215b77139d48a37a2ab2379e936df2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/950dcf70b0fad6f9dbbc6ea38ae1c15c.png)
原式![](https://staticzujuan.xkw.com/quesimg/Upload/formula/950dcf70b0fad6f9dbbc6ea38ae1c15c.png)
请你在理解的基础上,模仿上述方法求下列各式的值:
(1)
________.
(2)计算:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b28307d1b5ab744677907e4bb648d96.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a90f7abe619aab652d6fd2531f77b27.png)
解:设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ba77e9711cb2a43aef52010e278a4bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a71692850542676cb0daefc66064c59e.png)
即
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae8946864162f2da9729f479a7efffea.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bfc339cf6dd66599db64fa3fa44e608.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47215b77139d48a37a2ab2379e936df2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/950dcf70b0fad6f9dbbc6ea38ae1c15c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/950dcf70b0fad6f9dbbc6ea38ae1c15c.png)
请你在理解的基础上,模仿上述方法求下列各式的值:
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3996d76e3f6c27b0f545c7795353fdb0.png)
(2)计算:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2c729f39e92f071798c5d5392890fc1.png)
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【推荐2】已知a+b=1,ab=-1.设![](https://img.xkw.com/dksih/QBM/2018/2/18/1885203915456512/1895083127169024/STEM/4372d61c71594f35bbaee20b2710a232.png?resizew=331)
(1)计算S2;
(2)请阅读下面计算S3的过程:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a0b015ab464730fcf51907984577662.png)
=
=
=
∵a+b=1,ab=-1,
∴
_______.
你读懂了吗?请你先填空完成(2)中S3的计算结果;再计算S4;
(3)猜想并写出
,
,
三者之间的数量关系(不要求证明,且n是不小于2的自然数),根据得出的数量关系计算S8.
![](https://img.xkw.com/dksih/QBM/2018/2/18/1885203915456512/1895083127169024/STEM/4372d61c71594f35bbaee20b2710a232.png?resizew=331)
(1)计算S2;
(2)请阅读下面计算S3的过程:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a0b015ab464730fcf51907984577662.png)
=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ff2a7301371e383614aff8fbeb2162b.png)
=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de581c7494c1b644f778b387c402599f.png)
=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11ebd1e984ad8776b9dfbf6834ea8505.png)
∵a+b=1,ab=-1,
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4365d4549d44e8188778db259a26a48a.png)
你读懂了吗?请你先填空完成(2)中S3的计算结果;再计算S4;
(3)猜想并写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/706ac8040e8a3110a27e671662696531.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55e06de381c46e58d40aaced29d9297e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
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