名校
解题方法
1 . 已知服从正态分布
的随机变量在区间
,
和
内取值的概率分别为68.3%,95.4%和99.7%.某校为高一年级1000名新生每人定制一套校服,经统计,学生的身高(单位:cm)服从正态分布
,则适合身高在155~175cm范围内的校服大约要定制( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29bcc248a7770a16fa10fc4602d71e0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2c675421352a8e2eb4fff2a0648fe00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c96af49ebd3f04ab8da77384c4473e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6160e680fa4d92a11568ef45bea128fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d5754f946f5b1edc5ffad73ccbcfd0.png)
A.683套 | B.954套 | C.972套 | D.997套 |
您最近一年使用:0次
解题方法
2 . 下列说法中正确为( )
A.已知函数![]() ![]() ![]() ![]() ![]() |
B.若一元二次不等式![]() ![]() |
C.设集合![]() ![]() ![]() |
D.命题“![]() ![]() |
您最近一年使用:0次
名校
解题方法
3 . 已知
(
).
(1)若
,求不等式
的解集;
(2)若对任意
,关于
的不等式
恒成立,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b29c4d9fc2b3095c4abb23ba456b088.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1e69392d21261afd8e5e5f096634669.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e258ab9e600435b37465092243d99f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c7679f885826301bb5a826ba7bcea01.png)
(2)若对任意
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4166972dec0aa3e8694a44eeb941a08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3a075dce77c9a6b964a8a3fc1ee6e8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
您最近一年使用:0次
2021-07-12更新
|
217次组卷
|
6卷引用:吉林省长春市十一高中2020-2021学年高二下学期第三学程考试数学(文)试题
名校
4 . 函数
,
(
).
(1)求
的解集;
(2)当
时,
恒成立,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01dcaf3a079b36a11f419c22e265a31b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7df21b1d1af1758d1a60a28a109bf363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22dd8b3dc4c609bab82d356a5cc2208d.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/188281cc0c7af6e95c32b9bbb94ffc21.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90918b116ddc7dd7115ece5520dbd006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/447d6f62c09c1d05346fd16a24159f6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
您最近一年使用:0次
2020-07-24更新
|
174次组卷
|
4卷引用:吉林省延边第二中学2020-2021学年高二上学期期中考试数学(理)试题