1 . 给出下列四个命题:
(1)若
为假命题,则
均为假命题;
(2)命题“
”为真命题的一个充分不必要条件可以是
;
(3)已知函数
,则
;
(4)若函数
的定义域为
,则实数
的取值范围是
.
其中真命题的个数是
(1)若
![](https://img.xkw.com/dksih/QBM/2016/10/25/1573093733056512/1573093738708992/STEM/7aef61e5e52646d09c07e7786b71fc28.png)
![](https://img.xkw.com/dksih/QBM/2016/10/25/1573093733056512/1573093738708992/STEM/43ab18badfe1443898d418fe742babd5.png)
(2)命题“
![](https://img.xkw.com/dksih/QBM/2016/10/25/1573093733056512/1573093738708992/STEM/72b48a07ea5647eda7985b0e3a0872f9.png)
![](https://img.xkw.com/dksih/QBM/2016/10/25/1573093733056512/1573093738708992/STEM/ebb1c7812ab44ee3b6351d0b36004322.png)
(3)已知函数
![](https://img.xkw.com/dksih/QBM/2016/10/25/1573093733056512/1573093738708992/STEM/d0f043ca221d4f7593b7f8a20d258155.png)
![](https://img.xkw.com/dksih/QBM/2016/10/25/1573093733056512/1573093738708992/STEM/369d0f62946745d09ed376839d64adc4.png)
(4)若函数
![](https://img.xkw.com/dksih/QBM/2016/10/25/1573093733056512/1573093738708992/STEM/985c9af6f27c45e0acb6c6611379053a.png)
![](https://img.xkw.com/dksih/QBM/2016/10/25/1573093733056512/1573093738708992/STEM/be74c73ca843431d90d2585585cd6c76.png)
![](https://img.xkw.com/dksih/QBM/2016/10/25/1573093733056512/1573093738708992/STEM/c39f09eb37fa44cfac94ae27fa995575.png)
![](https://img.xkw.com/dksih/QBM/2016/10/25/1573093733056512/1573093738708992/STEM/40fbd1b2bdcf414b88fd094b92632257.png)
其中真命题的个数是
A.0 | B.1 | C.2 | D.3 |
您最近一年使用:0次
2 . 给出下列几个命题:
①命题
任意
,都有
,则
”:存在
,使得
.
②命题“若
且![](https://img.xkw.com/dksih/QBM/2017/1/6/1619445101486080/1619445101740032/STEM/1f8aee01d0a54edd92b491df11ba5cfc.png)
且
”的否命题为假命题.
③空间任意一点
和不共线的三点
、
、
,若
,则
、
、
、![](https://img.xkw.com/dksih/QBM/2017/1/6/1619445101486080/1619445101740032/STEM/3e2a340c5ac342648b03b513a6c7e395.png)
四点共面.
④线性回归方程
对应的直线一定经过其样本数据点
、
、…,
中的一个.
其中不正确的个数为
①命题
![](https://img.xkw.com/dksih/QBM/2017/1/6/1619445101486080/1619445101740032/STEM/e38866a16bba4113a5524226ea30c057.png)
![](https://img.xkw.com/dksih/QBM/2017/1/6/1619445101486080/1619445101740032/STEM/62e057f10d9a43eaa3683f1138571b57.png)
![](https://img.xkw.com/dksih/QBM/2017/1/6/1619445101486080/1619445101740032/STEM/88626f2fa51e4310abe08f1dccc080f8.png)
![](https://img.xkw.com/dksih/QBM/2017/1/6/1619445101486080/1619445101740032/STEM/baf3a1ec1a4841b7becebc67e9e43909.png)
![](https://img.xkw.com/dksih/QBM/2017/1/6/1619445101486080/1619445101740032/STEM/6df24cd16f6544da9453c2dec8bd3d9d.png)
![](https://img.xkw.com/dksih/QBM/2017/1/6/1619445101486080/1619445101740032/STEM/3a2a588e364143ff8c222d4a8eb0a1a1.png)
②命题“若
![](https://img.xkw.com/dksih/QBM/2017/1/6/1619445101486080/1619445101740032/STEM/12a28480ade84049bbdba88aa006d567.png)
![](https://img.xkw.com/dksih/QBM/2017/1/6/1619445101486080/1619445101740032/STEM/1f8aee01d0a54edd92b491df11ba5cfc.png)
![](https://img.xkw.com/dksih/QBM/2017/1/6/1619445101486080/1619445101740032/STEM/6a7dd34aebbc4c428235c04b0fee75d7.png)
![](https://img.xkw.com/dksih/QBM/2017/1/6/1619445101486080/1619445101740032/STEM/948a5172f32f4b609a1d71e169507527.png)
③空间任意一点
![](https://img.xkw.com/dksih/QBM/2017/1/6/1619445101486080/1619445101740032/STEM/43dc44a2fd8148faa74fb656bb21bdac.png)
![](https://img.xkw.com/dksih/QBM/2017/1/6/1619445101486080/1619445101740032/STEM/f13a75cf8fcc4c9c8368fcad505c0cac.png)
![](https://img.xkw.com/dksih/QBM/2017/1/6/1619445101486080/1619445101740032/STEM/02f4868789d04ad3b0e8ef63259c44be.png)
![](https://img.xkw.com/dksih/QBM/2017/1/6/1619445101486080/1619445101740032/STEM/3e2a340c5ac342648b03b513a6c7e395.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef7d02a82790eaa113fc0ba667e84038.png)
![](https://img.xkw.com/dksih/QBM/2017/1/6/1619445101486080/1619445101740032/STEM/d25acdd40c394b15b0e2c7f1ea50f741.png)
![](https://img.xkw.com/dksih/QBM/2017/1/6/1619445101486080/1619445101740032/STEM/f13a75cf8fcc4c9c8368fcad505c0cac.png)
![](https://img.xkw.com/dksih/QBM/2017/1/6/1619445101486080/1619445101740032/STEM/02f4868789d04ad3b0e8ef63259c44be.png)
![](https://img.xkw.com/dksih/QBM/2017/1/6/1619445101486080/1619445101740032/STEM/3e2a340c5ac342648b03b513a6c7e395.png)
四点共面.
④线性回归方程
![](https://img.xkw.com/dksih/QBM/2017/1/6/1619445101486080/1619445101740032/STEM/8a9575f2d3de4ce4ad88d48b4529de67.png)
![](https://img.xkw.com/dksih/QBM/2017/1/6/1619445101486080/1619445101740032/STEM/b7ac535a88d645beb129b093b2b01c56.png)
![](https://img.xkw.com/dksih/QBM/2017/1/6/1619445101486080/1619445101740032/STEM/22d22ec86b8540c3b12c778a873c878e.png)
![](https://img.xkw.com/dksih/QBM/2017/1/6/1619445101486080/1619445101740032/STEM/4bfa31b001274f04bbddd63113bb5b0f.png)
其中不正确的个数为
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次