题目
题型:不详难度:来源:
①若“
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103065239-73980.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103065239-71446.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103065239-73980.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103065239-71446.png)
②命题“若
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103065239-23031.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103065240-59182.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103065240-30469.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103065240-96020.png)
③“
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103065241-60721.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103065241-78166.png)
④等比数列
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103065241-31973.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103065241-48755.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103065241-31973.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103065242-60535.png)
其中不正确的命题个数是
A.4 | B.3 | C.2 | D.1 |
答案
解析
试题分析:对于①若“
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103065239-73980.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103065239-71446.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103065239-73980.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103065239-71446.png)
对于②命题“若
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103065239-23031.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103065240-59182.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103065240-30469.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103065240-96020.png)
对于③“
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103065241-60721.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103065241-78166.png)
对于④等比数列
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103065241-31973.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103065241-48755.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103065241-31973.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103065242-60535.png)
点评:本题以命题真假的判断为载体,着重考查了不等式的性质、利用导数研究函数的单调性与极值和导数的运算法则等知识点,属于中档题.
核心考点
试题【给出如下四个命题:①若“且”为假命题,则、均为假命题;②命题“若,则”的否命题为“若,则”;③“”的否定是“”;④等比数列中,首项,则数列是递减数列的充要条件是】;主要考察你对简单逻辑联结词等知识点的理解。[详细]
举一反三
①下面给出四种说法:
①设
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103065231-95363.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103065231-45397.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103065231-24784.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103065231-21101.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103065231-21991.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103065232-45428.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103065232-85565.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103065231-21101.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103065231-21991.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103065231-21991.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103065232-32594.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103065232-45428.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103065232-25801.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103065232-26468.png)
②在线性回归模型中,相关指数
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103065232-29252.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103065232-29252.png)
③绘制频率分布直方图时,各小长方形的面积等于相应各组的组距;
④设随机变量
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103065233-66390.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103065233-57965.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103065233-54078.png)
其中正确的说法有 (请将你认为正确的说法的序号全部填写在横线上)
(1)若
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103065224-56599.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103065224-50091.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103065224-55910.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103065224-23042.png)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103065224-38693.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103065225-18605.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103065224-23042.png)
(3)若不平行的两个非零向量
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103065225-45367.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103065225-74349.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103065225-20051.png)
(4)若
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103065225-54339.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103065225-69288.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103065226-72576.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103065218-54182.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103065218-41543.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103065218-54182.png)
A.充分不必要条件 | B.必要不充分条件 |
C.充要条件 | D.既不充分也不必要条件 |
A.命题“若![]() ![]() ![]() ![]() |
B.“![]() ![]() |
C.命题“![]() ![]() ![]() ![]() |
D.命题“在![]() ![]() ![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103065208-99202.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103065208-47725.png)
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