解题方法
1 . 某集团为获得更大的收益,每年要投入一定的资金用于广告促销.经调查,每年投入费t(单位:百万元),可增加销售额约为
(单位:百万元)(
).
(1)该公司将当年的广告费控制在3百万元之内,则应投入多少广告费,才能使该公司获得的收益最大?
(2)该公司准备共投入3百万元,分别用于广告促销和技术改造.经预测,每投入技术改造费
(单位:百万元),可增加的销售额为
(单位:百万元).请设计一个资金分配方案,使该公司获得的收益最大.(注:收益=销售额-投入)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4855a61500a8d7fa4eaf2353a44ea337.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0277ef5d5f52b1c72c16d67593d8569e.png)
(1)该公司将当年的广告费控制在3百万元之内,则应投入多少广告费,才能使该公司获得的收益最大?
(2)该公司准备共投入3百万元,分别用于广告促销和技术改造.经预测,每投入技术改造费
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07e73721185abd5511352b172dd51c0a.png)
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名校
2 . 已知
.
(1)若
,求
的展开式中含
的项;
(2)若
,且
的展开式中含
的项的系数为24,那么当m,n为何值时,
的展开式中含
的项的系数取得最小值?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f16391866107d39f2d4df26719994f2.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d75f15715ba651225c343e657c91379f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/439e00f0abab91f7a1796ab96dcaeacf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b0a89e3c30f6e4d4c5db4378b05d987.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78c204be088a8fc6c096eedd5b1e7dc7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0eb7df298a9364b36e079a61caec815c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0eb7df298a9364b36e079a61caec815c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b0a89e3c30f6e4d4c5db4378b05d987.png)
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解题方法
3 . 已知
,且
,则下列结论正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2684b72f9f38f5046c8ecd4280b7b14b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d69582b1a383cda899bfae292812f69d.png)
A.![]() | B.![]() ![]() |
C.![]() ![]() | D.![]() |
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4 . 若当
时,
无限趋近于一个确定的值,则称这个确定的值为二元函数
在点
处对
的偏导数,记为
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7ff26e2362e1dec1a5a9b0ac01967ec.png)
若当
时,
无限趋近于一个确定的值,则称这个确定的值为二元函数
在点
处对
的偏导数,记为
,即
.已知二元函数
,则f'm,nx+f'm,ny的最小值是__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/965e4bba42c1945bf711ef186027f52a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed5bfc316ab38c6e4b8f5a9fa66cd29b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1595f06925491766c4e26be4c83085fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/136620de908d460adedad82e773c2480.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/618932fbfef25e4dc46ed1e9bacefb9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7ff26e2362e1dec1a5a9b0ac01967ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32ca6fa9955690cec01db601e3abce0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b89c85c3e1599b32abfb0c110eeb8c16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb8942f9d432eef33b6859677bbe3693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1595f06925491766c4e26be4c83085fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/136620de908d460adedad82e773c2480.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d00c5eb079d0e588fba56ba585f2ee4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fdd9174f63888a87df0aab6c3921824.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f804c95319cc42dc5222ff088809bd4.png)
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5 . 已知
.
(1)解不等式
.
(2)若
恒成立,求整数
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83885a8e289d2f6d47ae4c6d65472761.png)
(1)解不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3a075dce77c9a6b964a8a3fc1ee6e8c.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46324ba9decd3f916f22df90f366588e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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解题方法
6 . 在如图所示的试验装置中,两个正方形框架ABCD,ABEF的边长都是2,且它们所在的平面互相垂直.活动弹子M,N分别在正方形对角线AC和BF上移动,且CM和BN的长度保持相等,记
(
).
(2)a为何值时,MN的长最小?
(3)当MN的长最小时求平面MNA与平面MNB夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70cb6e0e0dd56071218d59d078e72f95.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d60ad593a207eae8c88b7dd855b5a581.png)
(2)a为何值时,MN的长最小?
(3)当MN的长最小时求平面MNA与平面MNB夹角的余弦值.
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7 . 已知
,
,
,
为空间中不共面的四点,且
,若
,
,
,
四点共面,则函数
的最小值是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.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/0f1055ddc14ba63aaff65a68d0baac64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.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/d491e80984e55c4a5bf0c2e28fa48c55.png)
A.2 | B.1 | C.![]() | D.![]() |
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8 . 已知空间向量
,若
共面,则
的最小值为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b09e89b7908e452a81c25881e6bc000e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e12e95f703ad30ab9a3d38376830989.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1019d4ad2e3fb4a7abb66e0e9e55b556.png)
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9 . (1)已知函数
,
,求
的最小值;
(2)已知函数
,
,求
的值域.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbdfe48038034eb671b3852e261c24f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37e347b2b13e28b090ba15607492546c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)已知函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/975a83ee1fc67818248cf92519cb3f7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79fe9f180572d57467e52bf16d3d0013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
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解题方法
10 . 若方程
的两个根是1和3,则对函数
下列正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1146110d4382c714c10de00dd1273b7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80027540415bd2b98c9be19e21b5f8d8.png)
A.在![]() |
B.不等式![]() ![]() |
C.在![]() |
D.最大值是![]() |
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