解题方法
1 . 已知函数
,
.
(1)证明:
;
(2)若随机变量X可取值为
,
,且
,2,
,n,
,
为X的数学期望.
证明:①
;
②
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9abecee7a893fa38b399ca4876f7778.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6e2e79843faf62dde86bf858d1e0569.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58196b9e63ec00aa1119052b6de6ae12.png)
(2)若随机变量X可取值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97ea8f47d8d8d9e1832d52b1c7425450.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fee4e4ef6bc78dc8e69bf99c2807b7b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c45176df950dfe48b8ca7eac08ee349.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daa5e9bd516f6282483b92cfe6074623.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37c357db106d48e3d8ed48f6b625d1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fc79c66ebaacd709ec9965b90a22b14.png)
证明:①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfd62051661b825cc27dea9aaa5bff24.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/179a1b0d9af3245bdf6c485f6007ace7.png)
您最近一年使用:0次
名校
2 . 已知函数
,其中
,函数
在
上的零点为
,函数
.
(1)证明:
①
;
②函数
有两个零点;
(2)设
的两个零点为
,证明:
.
(参考数据:
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7495c0f25cf04e5e59bb4ae43ffc4fa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c940cb46e4a6eae0b7172414c965b66f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/870ebc2f7aabb028024894568d749934.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79b752f0f189e5d8666daea73e145dff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c353f6bf5422164ef1496838ba1e6de0.png)
(1)证明:
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ffa38ec984cae2089a6061c5b231dc5.png)
②函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be1ce3f01e2b6364f9a9fdaf197d5e29.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be1ce3f01e2b6364f9a9fdaf197d5e29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aca579894dad67bc82cb715fd48e0d70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05f127c78da4fd62e8e98f2262400bda.png)
(参考数据:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2995cf1665e01b853555e62aeaf0ac31.png)
您最近一年使用:0次
2022-12-16更新
|
1825次组卷
|
4卷引用:T8(华师一附中、湖南师大附中等)2023届高三上学期第一次学业质量评价数学试题
3 . 已知实数x,y满足
.
(1)若x=0时,试问上述关于y的方程有几个实根?
(2)证明:使方程
有解的必要条件为:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e7f838fc2f1f6364d51fceaeb6a5145.png)
(1)若x=0时,试问上述关于y的方程有几个实根?
(2)证明:使方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e7f838fc2f1f6364d51fceaeb6a5145.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f2222b10f3189590dfa35385970ce40.png)
您最近一年使用:0次
2022-03-11更新
|
301次组卷
|
2卷引用:中学生标准学术能力诊断性测试2022届高三下学期3月测试数学(新高考)试题
名校
4 . 有同学在研究指数函数
和幂函数
的图像时,发现它们在第一象限有两个交点
和
.通过进一步研究,该同学提出了如下两个猜想:请你证明或反驳该同学的猜想.
(1)函数
与函数
的图像在第一象限有且只有一个公共点;
(2)设
,
,且
,若
,则
.其中
为自然对数的底,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99b161347f6a2fcfd9bf0acf1e8a03fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/344ccbf79da6ad7e3709d6fa72efb756.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5511a368692de27c58ec48ce968de4a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a20027d8ff971795df94a4e81f30d00.png)
(1)函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2eae1b87c23b45ce5e5e74d5b1d73234.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8838adc7ebe83bcf1f22bac78c2e85.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d33da711e50e96568facb18cef27165.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/731bdc8d2686a05f12a2ba8a7e3b01be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2958030ec9d7543dda1f529593a915e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efdc0e0ca559f0f1af6127545f356fa2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/633f26c3aae8c77e80ec8532b20d73a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dcd143a57a268a5a8ef486e2a4d5c0a.png)
您最近一年使用:0次
2021-12-01更新
|
667次组卷
|
3卷引用:中学生标准学术能力诊断性测试2021-2022学年高三上学期11月测试理科数学试题