已知数列
.
(1)求出
;
(2)判断数列
的单调性并给出证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39b0662d72f2ee4f124cbc1ca1c71334.png)
(1)求出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe61d313eeca8ba47478a9de40540db8.png)
(2)判断数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
18-19高二下·辽宁沈阳·期中 查看更多[2]
更新时间:2020-03-30 13:27:37
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解答题-问答题
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【推荐1】已知数列{an}的前n项和
.
(1)计算a1,a2,a3,a4;
(2)猜想an的表达式,并用数学归纳法证明你的结论.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a455c4a9b6d62220fa0e4dfb54cac28.png)
(1)计算a1,a2,a3,a4;
(2)猜想an的表达式,并用数学归纳法证明你的结论.
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解题方法
【推荐2】已知数列
满足
,
.
(1)记
,写出
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,并求数列
的通项公式;
(2)求
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项和
.
![](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/cd088d847a0ba12df689b4c27b086eaf.png)
(1)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/314501f06c7e4bf3112fe41ecac7be68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b715e7842b95f654f16056a7c7f2abe9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13423c094861baf4b759b7f3d8c3c226.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)求
![](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/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
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解答题-证明题
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【推荐1】已知函数
,且
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(1)求函数
的表达式;
(2)若数列
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(3)猜想数列
的通项,并用数学归纳法证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df8f8120e0073e5e33cc70863352fe69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3118f9c895ae10f6779b5181da4ed79c.png)
(1)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e976c0663fa749ca749f99842d21ca03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92c23ed65ec47b37ffe5b79df476b14c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8ccd22fd0ca1a8e1468329284f91b6a.png)
(3)猜想数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e976c0663fa749ca749f99842d21ca03.png)
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解答题
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【推荐2】已知数列
满足
,
.
(I)求
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,
的值;
(Ⅱ)归纳猜想数列
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b5b95d2bc97a4c65a25e908bf97a34a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47e668c2466c9010016860da233e0d1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31f4989705bbadc355971dbbba3aa4c0.png)
(I)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67ca5f8ff8d09f008f30369c7ea389a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22a37655f9850c19e5908bb87444ac70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e3aa9d0386c17a5a746268748fe8288.png)
(Ⅱ)归纳猜想数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b5b95d2bc97a4c65a25e908bf97a34a.png)
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