1 . 一个数列
:当n为奇数时,
;当n为偶数时,
,求这个数列的前
项的和(m是正整数).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd974a15a43144eb7d629d09803cf8cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b469e90d4e799d324d40cea00a13c41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fad491e5b5e14c49ef8b7004ebcfcef9.png)
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2 . 求极限:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/719ed6a38273070de1eace677aadd60e.png)
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解题方法
3 . 已知数列
的首项
,它的前n项的和
,并且
是一个等比数列,其公比为p(
且
)
(1)证明:
(即
从第二项起)是一个等比数列;
(2)设
,求
(用b,p表示);
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/171a5ef9ae62d3b3979f5482018792dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62d87d5491656e0d9c970f8083f8db37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bf9769a87323ca73e4633d999ab6a48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81fbdf49cd00af1ff87259836ddd9f6b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbfc4eeaf0ca10986604c53f9c0a1958.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d72f109aceda27a70c12a6a8769b58c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1f58f7b69398a65528e686345f5faaa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3ed1c4b3e18212869e1af49604a2e0d.png)
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4 . 已知圆锥体的底面半径为
,高为
,求内接于这个圆锥体并且体积最大的圆柱体的高
(如图).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eabd5f3a86afe49dcd70571e2b96cfd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/11/9be41898-243f-443f-9e23-8c2b7ed86f01.png?resizew=155)
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5 . 若
,求证:
,
,
成等差数列.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0698663a010b301d1cbf0d46031cd7dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e81e59019989b7dc2fb59b037ef6e010.png)
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6 . 试问数列
前多少项的和的值最大?并求这最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4459afccfba1d133d5520b54670ca840.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d43e7ca52055622fd9e17a805c6d8aa.png)
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7 . 设三棱锥
中,
.求证:
是锐角三角形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6a94d59dee2d5a8f0425b64b2083825.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0322890c658fbcc82b89b4d716b275d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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8 . 已知两数
满足下列条件:
(1)它们的和是等差数列1,3,…的第20项;
(2)它们的积是等比数列2,
,…的前4项和,求根为
的方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ce7ae90d808f05e86ea063238e4b2f9.png)
(1)它们的和是等差数列1,3,…的第20项;
(2)它们的积是等比数列2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01317332a203c898536b1d0459f51d23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9621f4e4e579cbc1be1c0bc099cf3c7e.png)
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9 . 已知数列
的前
项和为
,
,
,,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04c2864e2ec3416cc4c081ac1f71a0af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d737c1047a14cee12a6671383e244fa5.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/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59557c76432f5350a610400e7ab8d27c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04c2864e2ec3416cc4c081ac1f71a0af.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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