在我国南宋数学家杨辉所著的《详解九章算法》一书中,用如图所示的三角形(杨辉三角)解释了二项和的乘方规律.右边的数字三角形可以看作当n依次取0,1,2,3,…时
展开式的二项式系数,相邻两斜线间各数的和组成数列
.例:
,
,
,….
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/26/959e3261-0d5e-4988-8a75-5a06e02faa95.png?resizew=383)
(1)写出数列
的通项公式(结果用组合数表示),无需证明;
(2)猜想
,与
的大小关系,并用数学归纳法证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f5abcb3802cf02be93a8c89067bd49a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c2037221d1ac40cf28e2ef5d60e8edd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0adbf307eef6f3610f342c57ddd275a6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/26/959e3261-0d5e-4988-8a75-5a06e02faa95.png?resizew=383)
(1)写出数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)猜想
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c587d225f909233b772abf6e6bed9a19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37ebf2173007b30775097510495febcd.png)
更新时间:2020-05-15 09:18:41
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适中
(0.65)
名校
【推荐1】设
,且
,记集合
的所有3个元素的子集为
,
,…,
,
为
中的最大元素
,2,…,
.
(1)当
时,求
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(2)求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea4ac187cbb465180e89f38250b3970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bcfc48f9bc23cc43085bdb910e7a136.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d90918011cfecdffc741aed27454bfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3b9e816b14051f785aa5aae72b8eed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a1965d69cf5177cd1ea5df7be68a363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a584b6ad5577ab3e2d22caf23e3c32b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e819b87f90651d89fcd258c276294e43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c45176df950dfe48b8ca7eac08ee349.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6390d2e78f97cd888034715046a783.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fac3649308b528fd56545ba102dc42d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b795a919ef36505c322a793e2f5377d.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6a68947ecd41a9a41b4e2c613912aed.png)
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【推荐1】一种十字绣作品由相同的小正方形构成,如图,图①②③④分别是制作该作品前四步时对应的图案,按照如此规律,第
步完成时对应图案中所包含小正方形的个数记为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/9/f28a904d-b6e7-4743-a789-82218153c290.png?resizew=222)
(1)求出
,
,
的值;
(2)利用归纳推理,归纳出
与
的关系式;
(3)猜想
的表达式,并写出推导过程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38fcec7af3520884b173b29bda6c657a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/9/f28a904d-b6e7-4743-a789-82218153c290.png?resizew=222)
(1)求出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5d55ef0d1b7ea88d92fd6e1ecebb5f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9347bb4ffedcbea2f4c16d047a138d75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b32a859898e9905e0524d3a982eb34b6.png)
(2)利用归纳推理,归纳出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b08d8e48f1a494bd7fa205362035952b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38fcec7af3520884b173b29bda6c657a.png)
(3)猜想
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38fcec7af3520884b173b29bda6c657a.png)
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【推荐2】某少数民族的刺绣有着悠久的历史,下图①、②、③、④为她们刺绣最简单的四个图案,这些图案都由小正方形构成,小正方形数越多刺绣越漂亮,现按同样的规律刺绣(小正方形的摆放规律相同),设第
个图形包含
个小正方形.
(1)求出
;
(2)归纳出
与
的关系式,并根据你得到的关系式求
的表达式;
(3)求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d4fc8faefb26b233d4aa9dbef043aae.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/24/00374c3b-fe2d-4001-b2fb-8c0307bb517e.png?resizew=407)
(1)求出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afc5119887c500b60dd3f3975068a363.png)
(2)归纳出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d81d4730668cce0bbeb1f8fd39e0b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d4fc8faefb26b233d4aa9dbef043aae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d4fc8faefb26b233d4aa9dbef043aae.png)
(3)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19f16ded042e7b4ab649f860d5b05669.png)
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【推荐1】等差数列
中,公差
是自然数,等比数列
中,
,
.现有数据①2,②3,③4,④5.当
中所有的项均为数列
中的项时,
可以取现有数据中的哪一个,为什么?有没有其他自然数也可以作为公差
?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
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解答题-问答题
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(0.65)
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【推荐2】已知数列
,
,
,
.
(1)求
,
,
的值,并猜想
的通项公式;
(2)用数学归纳法证明你的猜想.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b13a6e1d671215fc96e4bee3541d1096.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d1c630a2d419ec1a8387238fa4728e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a31419e0523278fb897fc050d234e9f8.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c1ccc6c74b8754e9bcbb3f39a11b6f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daf464629fa321a6ff7401ab79f07083.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
(2)用数学归纳法证明你的猜想.
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