题目
题型:不详难度:来源:
①若
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102091242-22200.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102091242-74223.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102091242-82072.png)
②已知平面
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102091243-14223.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102091243-88858.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102091243-63072.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102091243-39107.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102091243-21265.png)
③△ABC中
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102091244-82747.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102091244-55517.png)
④若动点P到点
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102091244-48007.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102091244-88415.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102091245-63387.png)
其中正确命题的序号为 。
答案
解析
①若
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102091242-22200.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102091242-74223.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102091242-82072.png)
②已知平面
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102091243-14223.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102091243-88858.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102091243-63072.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102091243-39107.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102091243-21265.png)
③△ABC中
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102091244-82747.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102091244-55517.png)
④若动点P到点
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102091244-48007.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102091244-88415.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102091245-63387.png)
核心考点
试题【下列四个命题:①若,则函数的最小值为;②已知平面,直线,若则//;③△ABC中和的夹角等于180°-A;④若动点P到点的距离比到直线的距离小1,则动点P的轨迹方】;主要考察你对四种命题等知识点的理解。[详细]
举一反三
①若函数
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102091233-71773.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102091233-91996.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102091233-85780.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102091233-77529.png)
②若不论
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102091234-38933.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102091234-90388.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102091234-35388.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102091234-74651.png)
③若
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102091235-13513.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102091235-69003.png)
④若命题“存在
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102091235-69128.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102091235-84828.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102091236-56682.png)
以上四个命题正确的是 (填入相应序号).
A.三点确定一个平面; |
B.三条相交直线确定一个平面; |
C.对于直线![]() ![]() ![]() ![]() ![]() |
D.对于直线![]() ![]() ![]() ![]() ![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102091204-69071.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102091204-80634.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102091204-76576.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102091205-38006.png)
A.1个 | B.2个 | C.3个 | D.4个 |
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102091159-22060.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102091159-51964.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102091200-97575.png)
①
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102091200-72611.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102091159-22060.png)
②
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102091200-39514.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102091159-22060.png)
③
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102091159-22060.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102091200-57048.png)
④
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102091159-22060.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102091201-31225.png)
则正确命题的序号是 .(写出所有正确命题的序号)
A.命题“若![]() ![]() ![]() |
B.若命题![]() ![]() |
C.若![]() ![]() ![]() |
D.![]() |
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