已知函数
.设命题
:
,
在
上至少有两个零点,关于命题
有以下四个判断:
①
为真命题;②
为
,
在
上至多有一个零点;
③
为假命题;④
为
,
在
上至多有两个零点.
其中判断正确的序号是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a76b4e281397b2f5a5b323ba5fffafd1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/699eef6923ef22c36b22177a0f18c6b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ffc1bb9d53a27d484396ad74d6a26e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa9d0700a3b9402a2958b90549ccfe34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ffc1bb9d53a27d484396ad74d6a26e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa9d0700a3b9402a2958b90549ccfe34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
其中判断正确的序号是( )
A.①② | B.②③ | C.③④ | D.①④ |
更新时间:2020-10-22 19:43:16
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【推荐1】下列说法正确的是( )
A.若![]() ![]() |
B.命题“![]() ![]() |
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D.若![]() ![]() |
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【推荐2】给出下列四个命题:
若
为
的极值点,则
”的逆命题为真命题;
“平面向量
,
的夹角是钝角”的充分不必要条件是
;
若命题
,则
;
命题“
,使得
”的否定是:“
,均有
”.其中不正确的个数是
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A.3 | B.2 | C.1 | D.0 |
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【推荐2】设命题
,
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/053be1852c6e4c16aba9d06912f31960.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d45b25db0d2661d7f18706369b43623.png)
A.命题p是真命题,![]() ![]() ![]() |
B.命题p是真命题,![]() ![]() ![]() |
C.命题p是假命题,![]() ![]() ![]() |
D.命题p是假命题,![]() ![]() ![]() |
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【推荐1】二次函数f(x)=ax2+bx+c(x∈R)的部分对应值如下表:
由此可以判断方程ax2+bx+c=0的两个根所在的区间是 ( )
x | -3 | -2 | -1 | 0 | 1 | 2 | 3 | 4 |
y | 6 | m | -4 | -6 | -6 | -4 | n | 6 |
A.(-3,-1)和(2,4) | B.(-3,-1)和(-1,1) |
C.(-1,1)和(1,2) | D.(-∞,-3)和(4,+∞) |
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解题方法
【推荐2】已知函数
,在下列区间中,包含
零点的区间是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1d0a425d94d55d6cfd1c04595adfc42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次