根据数列的前几项,写出下列各数列的一个通项公式:
(1)-1,7,-13,19,…
(2)0.8,0.88,0.888…
(3)
,
,
,
,
,
,…
(4)
,1,
,
,…
(1)-1,7,-13,19,…
(2)0.8,0.88,0.888…
(3)
![](https://img.xkw.com/dksih/QBM/2016/11/3/1573119065276416/1573119071150080/STEM/06b14b39e93e4b11831b997c864e3d9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d266a04f3dc7483eddbc26c5e487db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc5b4f5cb45361d752c50b0e40183f69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12984b40804450be64426247f2a3c4d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/060c1bcd39969f2371002f4886149276.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8b6d8b10fa95eed0be85f572a130bd2.png)
(4)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4b8503f4706b8321e4e79a87eadea84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4401b1421c08e525643180aef3f6dadd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aedb2b3655f0553e248adebbaf537c18.png)
16-17高二上·安徽六安·课后作业 查看更多[2]
更新时间:2016-12-04 23:41:51
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【知识点】 合情推理与演绎推理
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解答题-问答题
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适中
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解题方法
【推荐1】已知经过圆
上点
的切线方程是
,类比上述性质,直接写出经过椭圆
上一点
的切线,并尝试证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/555b3f0f1fa800a03de11718a666bdb6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/275bb66b8b128d42a53ab1b3dca79b62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d340bd3f078b9261238d4fe59f1473c1.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/275bb66b8b128d42a53ab1b3dca79b62.png)
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解答题-问答题
|
适中
(0.65)
【推荐2】在数列
中,
,
,归纳猜想这个数列的通项公式,并用三段论加以论证.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/606e55241a2e145d54849129b8ffd20f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e1e22e2c56ea9738f6378c80f413159.png)
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