1 . 已知
数列满足
,
.
(1)证明:数列
为等差数列;
(2)求数列
的前n项和
.
![](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/f0995730f94c8145c8974646f7db9878.png)
(1)证明:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28bdbde4eb7e4d4033bb9053b6c806e3.png)
(2)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a389a15145a549a04071f53c40451dc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
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2 . 为保护我国的稀土资源,国家限定某矿区的出口总量不能超过78吨,该矿区计划从2018年开始出口,当年出口a吨,以后每年出口量均比上一年减少
.
(1)以2018年为第一年,设第n年出口量为
吨,试求
的表达式;
(2)国家计划10年后终止该矿区的出口,问2018年最多出口多少吨?(
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f733b1ceeead9ff892539d46a23f3626.png)
(1)以2018年为第一年,设第n年出口量为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
(2)国家计划10年后终止该矿区的出口,问2018年最多出口多少吨?(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed2b13b42725616c277f2a150b5a5b27.png)
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3 . 在等差数列
中,若
和
是方程
的两实数根,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c1ccc6c74b8754e9bcbb3f39a11b6f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc858b7a95c5006a44067022da09f667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f412bbbaf5f23aa588d67bf1260a9a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ebce85ea9bc18815ef8887057030a63.png)
A.![]() | B.1 | C.2 | D.4 |
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4 . 数列
满足:
,则
的值为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88ecf1cafdaa33f99e59e44d1332e896.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce88126c3cbc88e03d38f56b7da315b6.png)
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5 . 数列
为等差数列,它的前n项和为
,若
,则λ的值是________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b70aa62d5dd947ec4d99ad3ef597937d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b708c8dcb2d66eb2ce0b3718a9cd924a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e2d5d03ebca76d050040bb1821b0b41.png)
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6 . 下列命题正确的有( )
A.若等差数列![]() ![]() ![]() ![]() ![]() ![]() |
B.若![]() ![]() ![]() |
C.若等差数列![]() ![]() ![]() ![]() ![]() ![]() ![]() |
D.若![]() ![]() |
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7 . 定义在
上的函数
的导函数为
,且
,则不等式
的解集为___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/870ebc2f7aabb028024894568d749934.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/724340d69477c0ec2418c392b22b1cab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1694fd90fae311c9514a79db582b5f49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3642334ba3a96faad9ab6c4e6dc05e0e.png)
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8 . 在数列
中,
,则通项公式![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f7fda69e2b32b9ced2239f915fa59b.png)
___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2356b5106ac0ace3a7dcdac4994a1fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f7fda69e2b32b9ced2239f915fa59b.png)
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2024-04-03更新
|
417次组卷
|
2卷引用:江西省南昌市第十中学2023-2024学年高二下学期第一次月考数学试题
名校
解题方法
9 . 已知函数
,
.
(1)求函数
的极值;
(2)令
是函数
图像上任意两点,且满足
,求实数a的取值范围;
(3)若
,使
成立,求实数a的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75c0b471c9a4ff941c65b0dc3b7605b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70cf3adcbbb5705690e7f27305c76c76.png)
(1)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)令
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6b229881b13d72d0fe3be1ed2593ec5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0eb7df298a9364b36e079a61caec815c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b87c2e6a41fbe97b9f28f5b77bd94787.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03e1f61457b8457b8c6e27014adf0d9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f2f64c0b155bc323c22a190f871395d.png)
您最近一年使用:0次
2024-04-02更新
|
310次组卷
|
2卷引用:江西省南昌市第十中学2023-2024学年高二下学期期中考试数学试题
名校
解题方法
10 . 已知数列的前
项和为
,
,
.
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)是否存在实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d9d53c8c47c48a560671ab22f9f0010.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
(3)已知数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10bbe743e6640126a235d574a34267ce.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/7774978b06be986e0d1a3e04ff0ce1a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f093c61867ee4ce75f951d46b9b123.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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