名校
1 . 下列推断错误的个数是
①命题“若
,则
”的逆否命题为“若
则
”
②命题“若
,则
”的否命题为:若“
,则
”
③“
”是“
”的充分不必要条件
④命题“
,使得
”的否定是:“
,均有
”.
①命题“若
![](https://img.xkw.com/dksih/QBM/2016/10/12/1573065985245184/1573065991069696/STEM/e1b49cd705fe4436a7d8757723bd5867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9741a2fca27f76be9834659c28fc6783.png)
![](https://img.xkw.com/dksih/QBM/2016/10/12/1573065985245184/1573065991069696/STEM/741cbf07664f498ab8192c395a475ce9.png)
②命题“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bad6987e8abfbf07d6a2650483d2a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bad6987e8abfbf07d6a2650483d2a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9741a2fca27f76be9834659c28fc6783.png)
③“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55cd8b0be2229425e6eaa6c0aed2e062.png)
![](https://img.xkw.com/dksih/QBM/2016/10/12/1573065985245184/1573065991069696/STEM/11a67fcf991f4df7b0f40d69ba0ea438.png)
④命题“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/786921d44625369b0e89c3020f41fb2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a44a53f07fb4e9af02564cfea7671dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51d05bfb81fb639a2697789174ac6f21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a44a53f07fb4e9af02564cfea7671dc.png)
A.1 | B.2 | C.3 | D.4 |
您最近一年使用:0次
2016-12-04更新
|
783次组卷
|
5卷引用:2016届山西右玉一中高三冲刺压轴卷四数学(理)试卷
2012·山西·模拟预测
2 . 下列各命题中正确的命题是
①“若
都是奇数,则
是偶数”的逆否命题是“若
不是偶数,则
都不是奇数”;
② 命题 “
”的否定是“
” ;
③ “函数
的最小正周期为
” 是“
”的必要不充分条件;
④“平面向量
与
的夹角是钝角”的充分必要条件是“
” .
①“若
![](https://img.xkw.com/dksih/QBM/2013/2/22/1571117392699392/1571117397884928/STEM/2d2f363c9a49457caf743265e1fb2e31.png)
![](https://img.xkw.com/dksih/QBM/2013/2/22/1571117392699392/1571117397884928/STEM/ad4f83405fed4139b834c723d02bc9fa.png)
![](https://img.xkw.com/dksih/QBM/2013/2/22/1571117392699392/1571117397884928/STEM/ad4f83405fed4139b834c723d02bc9fa.png)
![](https://img.xkw.com/dksih/QBM/2013/2/22/1571117392699392/1571117397884928/STEM/2d2f363c9a49457caf743265e1fb2e31.png)
② 命题 “
![](https://img.xkw.com/dksih/QBM/2013/2/22/1571117392699392/1571117397884928/STEM/c7703cfe40a8401ba99ac88da8cb5c2f.png)
![](https://img.xkw.com/dksih/QBM/2013/2/22/1571117392699392/1571117397884928/STEM/1a0c5d074298462081e0cdbd6b61b09c.png)
③ “函数
![](https://img.xkw.com/dksih/QBM/2013/2/22/1571117392699392/1571117397884928/STEM/5a06f802c0b84ca6bc25c9c4ac82d4d2.png)
![](https://img.xkw.com/dksih/QBM/2013/2/22/1571117392699392/1571117397884928/STEM/f0a22d9f4acd464fac05a3a9e8267cf4.png)
![](https://img.xkw.com/dksih/QBM/2013/2/22/1571117392699392/1571117397884928/STEM/f0ab7d52da9e459fa3d4fba4fb516a41.png)
④“平面向量
![](https://img.xkw.com/dksih/QBM/2013/2/22/1571117392699392/1571117397884928/STEM/f89df65acb604edab5804c37c906bbd3.png)
![](https://img.xkw.com/dksih/QBM/2013/2/22/1571117392699392/1571117397884928/STEM/e68460ead46e4a72b8d8072fc33e1001.png)
![](https://img.xkw.com/dksih/QBM/2013/2/22/1571117392699392/1571117397884928/STEM/f4f679e527244dbdbf83b36c499a06fa.png)
A.②③ | B.①②③ | C.①②④ | D.③④ |
您最近一年使用:0次