将正整数排成如图的三角形数阵,记第
行的
个数之和为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/29/92541fd2-b8bb-42dc-800a-3e970369a24b.png?resizew=138)
(1)设
,计算
,
,
的值,并猜想
的表达式;
(2)用数学归纳法证明(1)的猜想.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/29/92541fd2-b8bb-42dc-800a-3e970369a24b.png?resizew=138)
(1)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77b9fcf130e912aa06320d82793b65e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6899bf9cadae2ccdb14cbc87d4f280ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f30f56664446f32dbbc2c5f12a99374.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
(2)用数学归纳法证明(1)的猜想.
更新时间:2018-07-02 17:28:07
|
相似题推荐
解答题-问答题
|
较难
(0.4)
【推荐1】给正有理数
、
(
,
,
,且
和
不同时成立),按以下规则
排列:① 若
,则
排在
前面;② 若
,且
,则
排在
的前面,按此规则排列得到数列
.
(例如:
).
(1)依次写出数列
的前10项;
(2)对数列
中小于1的各项,按以下规则
排列:①各项不做化简运算;②分母小的项排在前面;③分母相同的两项,分子小的项排在前面,得到数列
,求数列
的前10项的和
,前2019项的和
;
(3)对数列
中所有整数项,由小到大取前2019个互不相等的整数项构成集合
,
的子集
满足:对任意的
,有
,求集合
中元素个数的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cf6b7ad3507b77771ea37b86dc6007c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ce017942d2202b78bf27e06c302b4e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b71af6590f0f369c164a054a8b63bf6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/738d701bf35c715a18b1e917d188a115.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5d7e6fcf7d4cec0c501e8a722e2da9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d10a4bd011e841f602958af6b3867db1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edd14c22f443140dbf6ff615c48c951e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a7601433bc1a101827dc2d7f990fbd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cf6b7ad3507b77771ea37b86dc6007c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ce017942d2202b78bf27e06c302b4e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0c5c16d119c5debcfe6111f7122c445.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/675200825a65baf1b8dd49f566ecc481.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cf6b7ad3507b77771ea37b86dc6007c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ce017942d2202b78bf27e06c302b4e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
(例如:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23cfdf8490365bd5f046c9db6be7d554.png)
(1)依次写出数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
(2)对数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce83115a50f99e08e9a2db7267aeed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce83115a50f99e08e9a2db7267aeed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f3cf6f2bbe20a404fea41a4d2b1c4c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/453e398c6f4b0f5247906161e084ed2d.png)
(3)对数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c077edc783173d305f782378c885866.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75c693640f81c5ef544b9beadf44bc25.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6476f3aaf9334a2cc33ab40cb9a9dbf5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
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解答题-证明题
|
较难
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解题方法
【推荐2】已知:正整数列
各项均不相同,
,数列
的通项公式![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f44d3c3cbd26b797a70e5fd060f3106.png)
(1)若
,写出一个满足题意的正整数列
的前5项:
(2)若
,求数列
的通项公式;
(3)证明若
,都有
,是否存在不同的正整数
,j,使得
,
为大于1的整数,其中
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a37a59558292ad6b3d0978bfd7484990.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de777c4e44546bcfe26ad5b6bb418052.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f44d3c3cbd26b797a70e5fd060f3106.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9a7269903c6005c0645a6033c8c1dd3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d11adcab5f73046ada2b4dd21ba74614.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(3)证明若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21d2e7f3d5771184a5a93749368dc2a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f33e3c5a9ab39e55e78d6aef60e5e3d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c05b9832b09731a574d4a4adf7448de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b97c28585cf80e2b403c8e23ac391573.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2690c409f513b571c3c2548228536d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b204cd055cc01b4fc9dd888b8348d12.png)
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解题方法
【推荐3】题图是某神奇“黄金数学草”的生长图.第1阶段生长为竖直向上长为1米的枝干,第2阶段在枝头生长出两根新的枝干,新枝干的长度是原来的
,且与旧枝成
,第3阶段又在每个枝头各长出两根新的枝干,新枝干的长度是原来的
,且与旧枝成
,…,依次生长,直到永远.(参数数据:
,
)
![](https://img.xkw.com/dksih/QBM/2022/4/22/2963684927225856/2964931342090240/STEM/fc2bb8d6-3738-4507-bfa9-495f7d81253d.png?resizew=472)
(1)求第3阶段“黄金数学草”的高度;
(2)求第13阶段“黄金数学草”的所有枝干的长度之和;(精确到0.01米)
(3)该“黄金数学草”最终能长多高?(精确到0.01米)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/029d393bb07b7140905b85f550519de4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f785147690f83dcee0a0bc6c327e75a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/029d393bb07b7140905b85f550519de4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f785147690f83dcee0a0bc6c327e75a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/368763128d1ad0ffad5d859fef834d0a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffb2e2e85ce8545385fb1bf2ba003e7d.png)
![](https://img.xkw.com/dksih/QBM/2022/4/22/2963684927225856/2964931342090240/STEM/fc2bb8d6-3738-4507-bfa9-495f7d81253d.png?resizew=472)
(1)求第3阶段“黄金数学草”的高度;
(2)求第13阶段“黄金数学草”的所有枝干的长度之和;(精确到0.01米)
(3)该“黄金数学草”最终能长多高?(精确到0.01米)
您最近一年使用:0次
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名校
【推荐1】(1)已知数列
的通项公式:
,试求
最大项的值;
(2)记
,且满足(1),若
成等比数列,求p的值;
(3)如果
,
,
,且p是满足(2)的正常数,试证:对于任意自然数n,或者都满足
,
,或者都满足
,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c88555de2786c301cc6b80ea2bdf804.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/636d91e02217d7f816df67bcb52603b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b6d5f1092725deca62cda07176dfad.png)
(3)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2a2df9e31c118e41741693e25bcfe6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a76d202cd606e99aac7eb6a55b800aff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09bf2c8f2070665177c91fd691f7edc5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75368dcc2f722ca51745f9f8e2f6df45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d341f6ec7afd35b0d75f509ab8428a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e36212f055ea05952133566ecc2f61c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfbb571b0f69b0daaf02e8e900a7a083.png)
您最近一年使用:0次
【推荐2】设
.
(1)若
,求数列
的通项公式;
(2)若
,问:是否存在实数c使得
对所有
成立?证明你的结论.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9158572f5aed00e99e7e878dd9b7242.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a3c442579603164f3fc19458677d307.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b86304c3e26200299a0480641525a283.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e25587e32f38ac1161344f080f7a7fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea4ac187cbb465180e89f38250b3970.png)
您最近一年使用:0次