名校
解题方法
1 . 在
的展开式中,______.
现在有以下三个条件:
条件①:第4项和第2项的二项式系数之比为
;
条件②:只有第6项的二项式系数最大:
条件③:其前三项的二项式系数的和等于56.
请从上面三个条件中选择一个补充在上面的横线上,并解答下列问题:
(1)展开式中所有二项式系数的和;
(2)展开式中的系数最大项.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15d90c53fa7d50cbff506a03da46842d.png)
现在有以下三个条件:
条件①:第4项和第2项的二项式系数之比为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/262eee8b241f2ff8fdca8d0479ca3918.png)
条件②:只有第6项的二项式系数最大:
条件③:其前三项的二项式系数的和等于56.
请从上面三个条件中选择一个补充在上面的横线上,并解答下列问题:
(1)展开式中所有二项式系数的和;
(2)展开式中的系数最大项.
您最近一年使用:0次
解题方法
2 . 已知函数
的一段图象如下图所示:
的解析式.
(2)将函数
的图象上所有点保持纵坐标不变,把图象上所有点的横坐标伸长到原来的4倍,再把图象上所有点向右平移
个单位,得到
的图象.则当
时,求函数
的值域.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b0ef9d537e1849ed448318247dce9f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d275fbb3ee5cd1177ca5a2ceecbbef0f.png)
(2)将函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0afb80007983e5b99dcdeebf87d18ff4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac1a63ab608517bb10aa036783dfb51f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb2faa63899873813748f6a28b8a92e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4deb7ec68a4e56ccfef8995de3ae3b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/028517e8bebe634441e0a5c79828e88a.png)
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3 . 曲线
在点
处的切线的斜率为
,求该曲线在点
处的切线方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3daad3a31a3597f75fa109736ed2ebf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
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4 . 为建立健全国家学生体质健康监测评价机制,激励学生积极参加身体锻炼,教育部印发了《国家学生体质健康标准》,要求各学校每学年开展覆盖本校各年级学生的《标准》测试工作.为做好全省的迎检工作,某市在高三年级开展了一次体质健康模拟测试,并从中随机抽取了500名学生的数据,根据他们的健康指数绘制了如图所示的频率分布直方图.
(2)由频率分布直方图知,该市学生的健康指数X近似服从正态分布N(
,
),其中
近似为样本平均数
,
近似为样本方差
(
=84.75).
①求P(60.29≤X≤87.92);
②已知该市高三学生约有30000名,记健康指数在区间[60.29,87.92]的人数为
,试求E(
).
附:参考数据:
,若随机变量X服从正态分布N(
,
),则
,
,
.
(2)由频率分布直方图知,该市学生的健康指数X近似服从正态分布N(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1100379a4385b9ce064847bc21760adc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/742d3e642d52e01899f66df411100838.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1100379a4385b9ce064847bc21760adc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfbe7f95b5d89f9409ec24536da9e826.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/742d3e642d52e01899f66df411100838.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/671f43c79d612c93a6d160335e86e177.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/671f43c79d612c93a6d160335e86e177.png)
①求P(60.29≤X≤87.92);
②已知该市高三学生约有30000名,记健康指数在区间[60.29,87.92]的人数为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b734e8f1546481e3eb4976008a045de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b734e8f1546481e3eb4976008a045de.png)
附:参考数据:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/215a23f001e42c459c3329105cc26411.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1100379a4385b9ce064847bc21760adc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/742d3e642d52e01899f66df411100838.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4486cbe4060101c5ff1dcbb185b73f95.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8afa0321d2c508f37969ea22eae4a3e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e9a5bc966078b4055a57d2a5b09a2f5.png)
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5 . 如图,某大型厂区有三个值班室
,值班室
在值班室
的正北方向3千米处,值班室
在值班室
的正东方向4千米处,仓库
在
边上且满足
.
到值班室
的距离;
(2)保安甲沿
从值班室
出发行前往值班室
,保安乙沿
从值班室
出发行前往值班室
,甲乙同时出发,甲的速度为
,乙的速度为
.若甲乙两人通过对讲机联系,对讲机在厂区内的最大通话距离不大于3千米,请问有多长时间两人不能通话?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942a9a6bde4a5b9803b68b1e9065de62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(2)保安甲沿
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b1dfb863105600ca271cd6a597187ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15bca4fc0b0fc4f8e492d8c1fe449c9b.png)
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解题方法
6 . 如果n项有穷数列
满足
,
,…,
,即
,则称有穷数列
为“对称数列”.
(1)设数列
是项数为7的“对称数列”,其中
成等差数列,且
,依次写出数列
的每一项;
(2)设数列
是项数为
(
且
)的“对称数列”,且满足
,记
为数列
的前
项和.
①若
,
,…,
构成单调递增数列,且
.当
为何值时,
取得最大值?
②若
,且
,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd94aeeecf0123921d4aef51c5defcf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/341bd4ff68347b38c8e3f9e5a3b665dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/692f0652866d5e18fa597d40bfc3cac2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7104e10aa92b7fd3eb4e497263186664.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(1)设数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a447e5baee4f7518706498d4aca7553b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57a03258158539436dd0e35c7e50e771.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)设数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/897d8f6cf00391f1b3ff70432f0121b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b08c58baacec3cd0c0a06e267fa9ec5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c972cbd63decec197aec1bdc306de67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a22e9369b6a9bb29239a519c10ec392c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7936359df4c926b72b48c6fdae55f12d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b76f79be89b8c6227b68eded6b675546.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9e5dfcc28321b563a8012ec2899c502.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db0e83ab6e88006fcca1d1b92e474d38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a31ec8dee46f3affe69cbdb2abbe8feb.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebea127cabddcc7adf4fe527b2472e5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f5369a97c0c1c45293ac014bd060d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
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7 . 已知
,求
(1)
及
的值;
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9626e5b9db3f22a442f10fef71b76f83.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a6aad40c02d5217af4535853938065b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cc9750c313ee972124cb62c4a6fb7ea.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/626cca880ae8dfcda582fa50f9838a70.png)
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8 . 函数
(
,
,
)的部分图象如图,
和
均在函数
的图象上,且Q是图象上的最低点.
的单调递增区间;
(2)若
,
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fcd3cea5f5e2fe943490dcb65d74c73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13378be06b6b01bcad1d261ff14e87cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4456675a5dbe545462a22cef9aca8fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29e1734dcc7697235124fbaba4ba6033.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/083169a97d6babe52eca51c2ed0aefb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c426f776a2e72a8300512bf52c35ca1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d275fbb3ee5cd1177ca5a2ceecbbef0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d275fbb3ee5cd1177ca5a2ceecbbef0f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9271992646b7bb71e0841d9d57912cf4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/920f7b809091d270731c50849a4388ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35f8c00c0bf7344ba3bc7984516d3d18.png)
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解题方法
9 . 如图所示,一隧道内设双行线公路,其截面由长方形的三条边和抛物线的一段构成,为保证安全,要求行驶车辆顶部(设为平顶)与隧道顶部在竖直方向上高度之差至少要有0.5米.
(2)经过点C和焦点的直线l与抛物线交于另一点Q,求
的值;
(3)若行车道总宽度AB为7米,请计算通过隧道的车辆限制高度为多少米(精确到0.1米)?
(2)经过点C和焦点的直线l与抛物线交于另一点Q,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eaf311e61e6f4c16ea84aae4956d2eb.png)
(3)若行车道总宽度AB为7米,请计算通过隧道的车辆限制高度为多少米(精确到0.1米)?
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10 . 已知函数
.
(1)若曲线
在点
处的切线斜率为3,求a的值;
(2)若
存在单调增区间,求a的取值范围;
(3)是否存在实数
,使得方程
在区间
内有且只有两个不相等的实数根?若存在,求出a的取值范围?若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27b1fb4f45e69862bd6aba8dd9530bc0.png)
(1)若曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bea9227dd0104da58e0c40952cc87ed.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bca4be345087f993a4078e16c16608e2.png)
(3)是否存在实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30df2c682a8e542dbf20b1e558f7b48a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe5239e374894f95da60c5cb35a2a718.png)
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