名校
解题方法
1 . 已知
,
是函数
的零点,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9c1f914da4657eca7865982b130b299.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d75442a901f013aeb5c52a7113ae9b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c487295d441397ea078d433e61087cec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67a91d7fa3be7708a277b8a836c5af89.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
名校
解题方法
2 . 已知函数
,且
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db5a31b613c4f70ac62a85d3218cec12.png)
___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26c79f0f2c29d40b3c0f877f21ceca76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da812ca7643c4b5cb9a1c8432b603b9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db5a31b613c4f70ac62a85d3218cec12.png)
您最近一年使用:0次
名校
3 . 已知函数
,若
使得
的图象在点
处的切线与
轴平行,则
的最小值是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52d458b75c3c5d9078ea50c42f9135ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd3691d7e6510dccb66ed928a0d9570e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d275fbb3ee5cd1177ca5a2ceecbbef0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8559f5db9b978cb2bd290dbce7268629.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/074c228ffc7b1e306f8410afe7bc4b5c.png)
A.2 | B.![]() | C.1 | D.![]() |
您最近一年使用:0次
解题方法
4 . 已知函数
.
(1)当
时,求函数
的单调区间;
(2)若
,不等式
恒成立,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67f366b050b2540d96526f1b47bac7f7.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e94f16d5ed858699bfea5039a7bf8ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6422b9c2e93a91fe9e39ce4d9dabb0fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aabfa1a31424c502f92f5cf0ad6ec8a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
您最近一年使用:0次
名校
解题方法
5 . 已知首项
的等差数列
中,
,若该数列的前
项和
,则
等于( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/087d10909ae373f63c33cf96f6b00c76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bf112130dff244208b5cc8b885313cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/547343b443dba2d77da457f77c21b204.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
A.10 | B.11 | C.12 | D.13 |
您最近一年使用:0次
名校
解题方法
6 . 已知
,则在复平面内
对应的点位于( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c1c8391d74592f32094a5d05d2b8058.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d41042207515dd2e8349c805e6aee400.png)
A.第一象限 | B.第二象限 | C.第三象限 | D.第四象限 |
您最近一年使用:0次
名校
7 . 如图,网格纸上绘制的是一个组合体的三视图,网格小正方形的边长为1,则该组合体的表面积为( )
A.![]() | B.![]() |
C.![]() | D.![]() |
您最近一年使用:0次
解题方法
8 . 如图所示,在正方体
中,M是棱
上一点,平面
与棱
交于点N.给出下面几个结论,其中所有正确的结论是( )
①四边形
是平行四边形;②四边形
可能是正方形;③存在平面
与直线
垂直;④任意平面
都与平面
垂直.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2b60b2457c371a51698973224606852.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
①四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2213cbd7555ee2a50435f9484d963c6b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2213cbd7555ee2a50435f9484d963c6b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2213cbd7555ee2a50435f9484d963c6b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2213cbd7555ee2a50435f9484d963c6b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13cfdc6224181d44e63aab43ddaf07ef.png)
A.①② | B.③④ | C.①④ | D.①②④ |
您最近一年使用:0次
名校
解题方法
9 . 为了解某一地区新能源电动汽车销售情况,一机构根据统计数据,用最小二乘法得到电动汽车销量
(单位:万台)关于
(年份)的线性回归方程
,且销量
的方差为
,年份
的方差为
.
(1)求
与
的相关系数
,并据此判断电动汽车销量
与年份
的线性相关性的强弱.
(2)该机构还调查了该地区90位购车车主的性别与购车种类情况,得到的数据如下表:
依据小概率值
的独立性检验,能否认为购买电动汽车与车主性别有关?
①参考数据:
.
②参考公式:线性回归方程为
,其中
,
;相关系数
,若
,则可判断
与
线性相关较强;
,其中
.附表:
![](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/ed451d9fb1c1458b6ee6133353c8cedb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6efa7cd52dc5f33ff6518853cf422659.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35d92f955a2da713e65311c97ae5b0db.png)
(1)求
![](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/11bc05f41215f9894e11d1df0465751a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)该机构还调查了该地区90位购车车主的性别与购车种类情况,得到的数据如下表:
性别 | 购买非电动汽车 | 购买电动汽车 | 总计 |
男性 | 39 | 6 | 45 |
女性 | 30 | 15 | 45 |
总计 | 69 | 21 | 90 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ead9d6ff51996f3ebace6f212e11a9e4.png)
①参考数据:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77fd494e3b77f33f500640520028f2f4.png)
②参考公式:线性回归方程为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce3a7d89965c094792f87594bd68afd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2dbdbf02e0dd324daba7488c3e3bf31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a58291bd91befe1061530246da983727.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3ae9421919944d997c304d7711b4b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04c50a398e93f8645c9e31eccce9d1f8.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/3bc485c58dbd6e50bfb352030f4a1c42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/356b05e46b10ee51c3e43546d73ec96c.png)
0.10 | 0.05 | 0.010 | 0.001 | |
2.706 | 3.841 | 6.635 | 10.828 |
您最近一年使用:0次
名校
解题方法
10 . 在钝角
中,
,
,
分别是
的内角
,
,
所对的边,点
是
的重心,若
,则
的取值范围是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/15c0dbe3c080c4c4636c64803e5c1f76.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/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac181587e24ada2d254f9918b62e70a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6402f1010e94be78552ed4c45548b1b8.png)
您最近一年使用:0次