名校
解题方法
1 . 设各项均为正数的等比数列
的前
项和
,若
,
,则
( )
![](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/4e4350dddc7cca2eac5f2671c6ea8370.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ca1290ebeed25074eaa854bfeadba18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/614306cc3f34bdee4d5d885b79667645.png)
A.![]() | B.![]() | C.15 | D.31 |
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2 . 已知数列
,记集合
.
(1)对于数列
,写出集合
;
(2)若
,是否存在
,使得
?若存在,求出一组符合条件的
,若不存在,说明理由;
(3)若
,把集合
中的元素从小到大排列,得到的新数列为
,若
,求
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3458fc91e73c89b7f5f7c1f474c4cd03.png)
(1)对于数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18af898259691fdc8b0a1c08eb4eb05b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9260f8989cfd0ffca5a49ffbc0668f14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f091f3424a0951bc94faa30c375f607d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b07ef9ec9ea51f0a0d16e39116dfbd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c639c7e5f1e7e7ee5d5ee2f30b155bb0.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a694ee63925fe653457f577063d6d7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e75ce7f5119e9c9c2fa8ee315c1c2ce1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25efaf1a568553b27434c71ddb447c9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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3 . 甲、乙、丙三人进行一种传球游戏:当球在甲手中时,甲将球保留(也记为一次传球)的概率为
,否则甲将球传给乙;当球在乙手中时,乙将球传给甲的概率为
,否则乙将球传给丙;当球在丙手中时,丙将球传给甲的概率为
,否则丙将球传给乙.初始时,球在甲手中.
(1)设传球三次后,球在甲手中的次数为
,求随机变量
的分布列和数学期望;
(2)传
次球后
,记球在乙手中的概率为
,求数列
的通项公式;
(3)在第(2)问的条件下,设
.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
(1)设传球三次后,球在甲手中的次数为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
(2)传
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89ba85f74cda4ddd621278e558bc036f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf83e20035c3afd6d26ebfd53d768a70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c5a325806df1a1c3e7ce609fe99085f.png)
(3)在第(2)问的条件下,设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c5480895acd403646b100881934402.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47574401ddb0aae1b96ca138b773a788.png)
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解题方法
4 . 已知数列
的前
项和为
,数列
为等比数列,且
,
分别为数列
第二项和第三项.
(1)证明数列
是等差数列,并求其通项公式;
(2)求数列
的通项公式及其前
项和
;
(3)若数列
,证明:数列
的前
项和
.
![](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/a14e8535ea550ba03ab3472bc3b7e143.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/614206299653e4111ac285f5375e34c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e0414c0b6fda7fee5eb71976e09da80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(1)证明数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)求数列
![](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/6ddad3d9fdb5e9951b6a1c31f9a72a71.png)
(3)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de1dbc77ec2b0644ea345164a33e4741.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b783cf91e34e692ce8e171f0965cb53f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02e80983b88cdf6b540502816c87d13.png)
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5 . 李华准备通过某银行贷款8800元,后通过分期付款的方式还款,银行与李华约定:每个月还款一次,分12次还清所有欠款,且每个月的还款额都相等,贷款的月利率为
,则李华每个月的还款额为( )(精确到0.01元,参考数据
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83ba85e8a856e9238c5f165e258d737a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7df00900dc7d918aa2af4b9580d910cd.png)
A.733.21元 | B.757.37元 | C.760.33元 | D.770.66元 |
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6 . “城在水上走,水在城中流”是对绥中县九门口水上长城的形象描述,景区坚持绿水青山就是金山银山的发展理念,计划从2024年开始,5年时间改善景区环境,预计第一年投入资金80万元,以后每年投入资金是上一年的
倍,第一年的旅游收入为200万元,以后每年旅游收入比上一年增加30万元,则这五年的旅游总收入与投入资金总额差额为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4b8503f4706b8321e4e79a87eadea84.png)
A.230万元 | B.234万元 | C.245万元 | D.260万元 |
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7 . 已知
.
(1)无穷等比数列
的首项
,公比
.求
的值.
(2)无穷等差数列
的首项
,公差
.求
的通项公式和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9c146b02e0e6f5900b99251d038a65d.png)
(1)无穷等比数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18156edebadef55784d134dd2cbf1df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b69378157f462688dc2560b4e0afd599.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/836d698e347d72b80820985bd1e1872d.png)
(2)无穷等差数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59641898f51efc98436bbd73110713f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73b225f8ece099828199fa8f8294f78f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5249095e0c2a28875a40a5d9c2c56bac.png)
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解题方法
8 . 若数列
满足![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa4c94c94981b312d85552f2c9cb2dc6.png)
,则该数列的前
项的和
_____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76aef4cdcb5af742ce28003b7b6c8c20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa4c94c94981b312d85552f2c9cb2dc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b3ac5b74d5aff61ae8f0ebddd7f3aa8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d37eae8a3cf8ef8a44162c82a7229a6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f69de231470d121157e3a4680667b9d.png)
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解题方法
9 . 在等比数列
中,
(1)已知
,
,求
;
(2)已知
,
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(1)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b13a6e1d671215fc96e4bee3541d1096.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f5b78d8869e45eb2baf7422155a0992.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23dd8dd8f0b19d19d17dd748d7df1ddd.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/924735888453775e0865af82c66497fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/370dc270435bcca46afdfabc3a34ee1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23dd8dd8f0b19d19d17dd748d7df1ddd.png)
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10 . 已知函数
,
.
(1)求曲线
在
处的切线方程;
(2)证明:对
,
恒成立(
为
的导数);
(3)设
,证明:
(
).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa7f9b35017daa8b524c5717a355834a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d86ef664d463a37a8e87bc44ea8b9e3.png)
(1)求曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb45f673c56a289ea78831c9237e8d20.png)
(2)证明:对
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3add1679c27392a1a7f635723a4b36eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39dcf482ef13601e671e3447f4bb5366.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/724340d69477c0ec2418c392b22b1cab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/becca2ccb37028c88f8ef8e521fad269.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/785ea6766915b83334e8569b73d6a6c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/930bc56406e69b785b37a83d48e36724.png)
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