已知数列
中,
,
.
(I)计算
的值;
(II)根据计算结果猜想
的通项公式,并用数学归纳法加以证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b13a6e1d671215fc96e4bee3541d1096.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77e47aaf677d6a7884f51630c80759d7.png)
(I)计算
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed529240a883f68f0921e818addeb9c8.png)
(II)根据计算结果猜想
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
更新时间:2016-12-03 18:15:12
|
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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】数学的发展推动着科技的进步,得益于线性代数、群论等数学知识的应用,5G技术正蓬勃发展.目前某区域市场中5G智能终端产品的制造仅能由H公司和G公司提供技术支持.据市场调研预测,5G商用初期,该区域市场中采用H公司与G公司技术的智能终端产品分别占比
及
.假设两家公司的技术更新周期一致,且随着技术优势的体现,每次技术更新后,上一周期采用G公司技术的产品中有20%转而采用H公司技术,采用H公司技术的仅有5%转而采用G公司技术.设第n次技术更新后,该区域市场中采用H公司与G公司技术的智能终端产品占比分别为
及
,不考虑其它因素的影响.
(1)求
,
;
(2)用
表示
,并求实数
使
是等比数列;
(3)经过若干次技术更新后该区域市场采用H公司技术的智能终端产品占比能否达到75%以上?若能,至少需要经过几次技术更新?若不能,请说明理由.(参考数据:
,
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccc5aa96d417631cd33f26005a445296.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70c63432559725cbacec8b5ca25ee3c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/686ece75006ad358f23314dc8a246e11.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b715e7842b95f654f16056a7c7f2abe9.png)
(2)用
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/090426eb29836bc30c006b3739c08057.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e8fac8067de1946d767aece487fb67d.png)
(3)经过若干次技术更新后该区域市场采用H公司技术的智能终端产品占比能否达到75%以上?若能,至少需要经过几次技术更新?若不能,请说明理由.(参考数据:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b58ebe6148d43fb701a23e039438c54.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8288e1d872c6b5872b84a32469ff9e76.png)
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名校
解题方法
【推荐2】已知数列
与
满足
,
且
,
,且
.
(1)设
,
,求
,并证明:数列
是等比数列;
(2)设
为
的前n项和,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43b7e7cd571c8cd141cbbfe5d0890bf6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9668edd792fc8fa3b36ea97eb97a5f59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4e33f55dbea026cc4f5bc9062974d24.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ff2aa68223dfc02f39d7d10fa005387.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea4ac187cbb465180e89f38250b3970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/039e4fe671d61e59b96ee525c9df43e8.png)
(1)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7cb1986891914137aeb155c76dc970c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea4ac187cbb465180e89f38250b3970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7936359df4c926b72b48c6fdae55f12d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c88a7ef007c78a93e33bd77c4396626.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b9a0d7150fb24be3e28ef7f0e18be93.png)
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【推荐1】已知函数
,数列
对于
,总有
,
.
(1)求
,
,
的值,并猜想数列
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/1151014385ae2556624150eaf7b8de23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f093c61867ee4ce75f951d46b9b123.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c6aa8089b5d9b722aff679af3c4d289.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ea8d0e50065114b05ef2dc1ea1129cf.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/63d471926f7b27322d90c82b9ce21d3d.png)
(2)用数学归纳法证明你的猜想.
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解答题
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【推荐2】已知数列
满足
,
.
(1)计算
,
,
,根据计算结果,猜想
的表达式;
(2)用数学归纳法证明你猜想的结论.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ea8d0e50065114b05ef2dc1ea1129cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/416d837f9da147f82febe9d15c810cc7.png)
(1)计算
![](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猜想的结论.
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解答题-问答题
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(0.65)
【推荐1】设等差数列
的前
项和为
,
,
,数列
的前
项和为
,满足
,
.
(1)求数列
、
的通项公式;
(2)记
,
,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6f35fa103e2d4cfb68dc624dc45608d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fdcc22d25c8a3443e301dc68677080c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcba622ae8d5e614f5f59982ce9b9b50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51368b30f2d402c8e8635bf33bb01592.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a9cf19be588565a3d596851f893aaa0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea4ac187cbb465180e89f38250b3970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d3a1bd67023b7cafa646f358c5b38c0.png)
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解答题-证明题
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解题方法
【推荐2】
个正数排成
行
列方阵,其中每一行从左至右成等差数列,每一列从上至下都是公比为同一个实数
的等比数列.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/caa2f3a71e06368e001740cd94baf348.png)
已知
,
,
.
(1)设
,求数列
的通项公式;
(2)设
,求证:
(
);
(3)设
,请用数学归纳法证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0358bf1f730cb732cfb56577fc811a84.png)
![](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/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/caa2f3a71e06368e001740cd94baf348.png)
已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fd60af36e62aeffc86026212d928e62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afa0cd4f10f119a5ee2c2fbb5cc65eb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a4cf2225a8252ce850350b8af03eff8.png)
(1)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/337fdb5fb463e398da3076faad25284f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bbc7cb7e981d316388600befe3de375.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5737f1f9cad2471f3ca53241b25a1eb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e97769855336d73371930df1f187875e.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdaaf9be6286b0d576047e725322d8e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cefb511d101f319394918196b4f1e9bc.png)
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