题目
题型:云南省期中题难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223938-44737.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223939-13475.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223939-27109.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223939-78573.png)
①
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223940-52485.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223940-41530.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223940-78070.png)
②
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223940-50686.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223941-33031.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223941-94719.png)
③
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223941-36388.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223941-44229.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223942-85335.png)
④
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223942-60615.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223942-90221.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223942-57980.png)
其中真命题的序号是:
B. ③、④
C. ①、④
D. ②、③
答案
核心考点
举一反三
①若a
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223933-94395.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223933-10292.png)
②若
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223933-18891.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223934-85286.png)
③若
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223934-93866.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223934-43810.png)
④定义在R上的函数f(x),若对任意的x
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223934-70873.png)
⑤已知a>0,b>0,则
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223934-86653.png)
其中真命题的编号是_________.
①命题“若x
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223927-73392.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223927-89945.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223927-56585.png)
②函数f(x)=lnx+x﹣
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223927-86631.png)
③不等式
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223928-32407.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223928-85106.png)
④函数
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223928-58962.png)
其中正确的序号是_________(把你认为正确命题的序号都填上)
①函数f(x)=x2(x∈R)是单函数;
②函数f(x)=2x(x∈R)是单函数,
③若f(x)为单函数,x1,x2∈A且x1≠x2,则f(x1)≠f(x2);
④在定义域上具有单调性的函数一定是单函数
其中的真命题是 _________ (写出所有真命题的编号)
B.“2、x、8成等差数列”是“x=5”的充分不必要条件
C.“ac2=bc2”的充要条件是“a=b”
D.若“p或q”是真命题,则p,q中至少有一个真命题
(1)若k∈R,且k
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223904-15973.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223905-16346.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223905-51042.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223905-51900.png)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223905-70834.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223905-81466.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223905-37566.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223905-14455.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223905-87062.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223906-74444.png)
(3)若不平行的两个非零向量
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223906-45801.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223906-69388.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223906-70495.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223906-68559.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223906-20638.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223907-97042.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223907-95408.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223907-41091.png)
(4)若
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223907-97562.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223907-66761.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223908-17385.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223908-74223.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223908-51778.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223909-21331.png)
(5)(
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223909-27480.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223909-78989.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223909-48510.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223910-46952.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223910-73054.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223910-41331.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223911-67550.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223911-79028.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223911-47678.png)
其中真命题的个数是
B.1
C.2
D.3
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