名校
1 . 已知
两城市的距离是
、根据交通法规,两城市之间的公路车速应限制在
,假设油价是6元
,以
的速度行驶时,汽车的耗油率为
,其它费用是36元
.为了这次行车的总费用最少,那么最经济的车速是______
(精确到
,参考数据
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c5a1095f11a367fc0bfdd114211fab3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63485ebe83696b2cafc4def229a72a40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a4f28d7d8a7d65eb5975c0ce63c0f9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45c374e788e84cbfee7e2ed8e736dc73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46606b6a3216fe6602234651c295a893.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ba775247f1c1878457d8a1617138b40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90ca55c030e7d88040525c4fb9a278f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e35c9a7ad2892527103ef7e0c0f01ccb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4231756409476912148b5094ce0701fb.png)
您最近一年使用:0次
2023-06-18更新
|
450次组卷
|
5卷引用:广东省佛山市S7高质量发展联盟2022-2023学年高二下学期第一次联考(4月)数学试题
名校
2 . 若实数
满足
,则下列不等式正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2597085e133936e7f4aac980f326b11a.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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解题方法
3 . 已知函数
.
(1)求不等式
的解集
;
(2)记(1)中集合M中最大的整数为t,若正数a,b,c满足
,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5ff29cd0e072669fff95e086443d0e8.png)
(1)求不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5967cc62862986840af4dd29df4bcc41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
(2)记(1)中集合M中最大的整数为t,若正数a,b,c满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/938322788bf627f1344ad6f725f00142.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e60685a39d6bae79d22174db3faf5cb.png)
您最近一年使用:0次
2023-06-14更新
|
377次组卷
|
3卷引用:四川省宜宾市翠屏区宜宾市第四中学校2022-2023学年高二下学期期末数学(文)试题
名校
解题方法
4 . 一企业生产某种产品,通过加大技术创新投入降低了每件产品成本,为了调查年技术创新投入
(单位:千万元)对每件产品成本
(单位:元)的影响,对近10年的年技术创新投入
,和每件产品成本
的数据进行分析,得到如下散点图,并计算得:
,
,
,
,
.
(1)根据散点图可知,可用函数模型
拟合
与
的关系,试建立
关于
的回归方程;
(2)已知该产品的年销售额
(单位:千万元)与每件产品成本
的关系为
.该企业的年投入成本除了年技术创新投入,还要投入其他成本10千万元,根据(1)的结果回答:当年技术创新投入出为何值时,年利润的预报值最大?(注:年利润=年销售额-年投入成本)
参考公式:附:对于一组数据
,其回归直线方程
的斜率和截距的最小二乘法估计公式分别为:
,
.
![](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/97ea8f47d8d8d9e1832d52b1c7425450.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b66c81abc6f1ad80b5edbad849a6f12f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acea5656e7a2a7fbd994ed5cce53bfd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dac71c75ec8cbfc530143ff30ad620b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eebf5a4c6d65526efc763e5c0c712945.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b224e8c4f60ef3895aedc9afaa2752b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2c724c59f9e6f574af9c84c9115ebe8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/16/56cec906-3d61-44ff-a63c-89f1e9e1c33f.png?resizew=298)
(1)根据散点图可知,可用函数模型
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea235b42c47bc2601855b635f115f536.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.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/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)已知该产品的年销售额
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e446683b24d1370008808fe82f6d114.png)
参考公式:附:对于一组数据
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdfdfe8d53069dda8eb532b55f802822.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/929ef3bed0a4bdd22f39e036506dc481.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81ec30e9316c79d956b7c9a483a91632.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45784b551925efcca7f85e257c01686c.png)
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解题方法
5 . 已知
且
,则
的最小值是__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2684b72f9f38f5046c8ecd4280b7b14b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5be97cd1c7111b654d87d8fbb63b6a84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4265ed0c1ff5ed28523c3a17e34068c.png)
您最近一年使用:0次
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解题方法
6 . 已知函数
.
(1)求不等式
的解集;
(2)若
的最小值为
,正数
,
满足
,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2452bb01dc0ccaed5a7ef02c84bfcbd5.png)
(1)求不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0abe4960954bb3144b7e86d4233e747.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e0ba25ed63bc3ac6412d4a1dc876928.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b57f879f6e8df7d5fb261328806260b3.png)
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7 . 已知数列
的前
项和为
,且
,
.
(1)求数列
的通项公式;
(2)令
,求证:
.
![](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/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5170584604571b5e1afd5ece941e2e73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be29d8f996c54183663d8a954166dc16.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)令
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cbb6b45ecc2d4141fb3c4a9bdd90054.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45cc65fd8233d6c78d4f943ba863713c.png)
您最近一年使用:0次
2023-05-29更新
|
392次组卷
|
3卷引用:4.4数学归纳法——课后作业(基础版)
名校
解题方法
8 . 已知函数
.
(1)解不等式
;
(2)已知
的最小值为
,正实数
,
满足
,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c20ca5659980f4f2a09b31f6b512e9a1.png)
(1)解不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/990d3feee85e869ea9ab561ff63d46a2.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffb3719fc3c69af58f27c7fafff84e26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3910a0f217d8109b9467f740fc84a73d.png)
您最近一年使用:0次
2023-05-26更新
|
774次组卷
|
5卷引用:内蒙古自治区赤峰市2022-2023学年高二下学期期末联考理科数学试题
解题方法
9 . 已知函数
.
(1)求不等式
的解集;
(2)已知函数
的最小值为
,且
,
,
都是正数,
,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4abee03d738d7f3d8d65555fdc94d8f.png)
(1)求不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0abe4960954bb3144b7e86d4233e747.png)
(2)已知函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48de42fc90f6c80a503d8bea9d4412ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5adf5bfbc5d41a5795e7d2d65d86b603.png)
您最近一年使用:0次
2023-05-13更新
|
409次组卷
|
4卷引用:四川省宜宾市2022-2023学年高二下学期期末数学文科试题
解题方法
10 . 已知函数
的最小值是
.
(1)求
的值;
(2)已知
,
,
且
,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b85f540cc39abc637c1ac7ddb6bb4e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1003dc3cafbe24c093399d1a3f619d84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67ca5fd57c2c2fcc3c7a574fdd1467d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cec12441802f71e803efaf2c62ee588.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2b8c7e9bf5f5e050fffb1769c83f0a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9637478a4b3023e608a6ac08ce9d6ffe.png)
您最近一年使用:0次
2023-05-12更新
|
279次组卷
|
2卷引用:陕西省西安市西咸新区泾河新城第一中学2022-2023学年高二下学期5月质量检测文科数学试题