1 . 命题A:点M的直角坐标是
,命题B:点M的极坐标是
,则命题A是命题B的
![](https://img.xkw.com/dksih/QBM/2016/5/12/1572634642522112/1572634647732224/STEM/d5030883f0854f64b3a5abf3d4aca538.png)
![](https://img.xkw.com/dksih/QBM/2016/5/12/1572634642522112/1572634647732224/STEM/ae11c851402a4be985c564915ab7383e.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 |
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2 . 下列说法正确的是
A.命题“若![]() ![]() |
B.命题“![]() ![]() |
C.命题“![]() ![]() |
D.“![]() ![]() |
您最近一年使用:0次
11-12高二上·福建三明·期中
3 . (1)写出命题“若
是偶数,则
是偶数”的否命题;并对否命题的真假给予说明.
(2)求证:“
”是“方程
无实根”的必要不充分条件.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632244ea6931507f8656e1cc3437d392.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20d6fc9b90f370fbb27552876b650f8f.png)
(2)求证:“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58b140e221ddf537b8964fff8557cca0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d5707186257494f1fea86066f2778b5.png)
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4 . 命题
,命题
,则
是
成立的.
![](https://img.xkw.com/dksih/QBM/2015/3/24/1572024488345600/1572024493498368/STEM/f8c666608f8b43cab7d448dcf9b4a0e1.png)
![](https://img.xkw.com/dksih/QBM/2015/3/24/1572024488345600/1572024493498368/STEM/c850215079094b5d8e1635b827305f0f.png)
![](https://img.xkw.com/dksih/QBM/2015/3/24/1572024488345600/1572024493498368/STEM/897a675358c640e389eb9bd01b457818.png)
![](https://img.xkw.com/dksih/QBM/2015/3/24/1572024488345600/1572024493498368/STEM/b812971ad79b414d85735718eb65cc58.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 |
您最近一年使用:0次
2016-12-03更新
|
386次组卷
|
3卷引用:2016届福建省三明一中高三上第二次月考理科数学试卷
解题方法
5 . 设集合
,
,那么“
或
”是“
”的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25188b6feb11e1b9b9a99526c86d32ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7843c7dabb6131a642b4674957e5d194.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5fb32dded72930d3f8a0fb081eb96a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae203a6425bc1cc630139f823bb79a23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d92dba43748af21419cc042803c1d4d5.png)
A.充分条件但非必要条件 |
B.必要条件但非充分条件 |
C.充分必要条件 |
D.非充分条件,也非必要条件 |
您最近一年使用:0次