已知二次函数
的二次项系数为a,且不等式
的解集为
,若方程
,有两个相等的根,则实数
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a4b3a8871db62a8344b5fb30cadfaac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3654254401fc902c3cb4912969f21f88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18e8213a386486caa7808e7ffad41a05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
A.![]() | B.1 | C.1或![]() | D.![]() ![]() |
19-20高一上·安徽铜陵·阶段练习 查看更多[2]
更新时间:2020-02-18 18:55:48
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【推荐1】已知二次函数
的图象如图所示,则它与
轴所围图形的面积为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/4/4514bc98-6670-4e6b-b956-1f49971b5459.png?resizew=159)
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A.![]() | B.![]() |
C.![]() | D.![]() |
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【推荐2】如图,在
中,
,
,
.P是AB边上一动点,
于点D,点E在P的右侧,
,连结CE.P从点A出发,沿AB方向运动,当E到达点B时,P停止运动.在整个运动过程中,图中阴影部分面积
的大小变化情况( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/9139b959-a2b2-4a00-a8a8-173bf09224ee.png?resizew=211)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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A.一直减小 | B.一直不变 |
C.先减小后增大 | D.先增大后减小 |
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【推荐1】已知函数
,
若存在实数x,使得
与
均不是正数,则实数m的取值范围是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06c07261d97255c5c1017a3a700d29ba.png)
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A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】定义:如果函数
在区间
上存在
,满足
,
,则称函数
是在区间
上的一个双中值函数,已知函数
是区间
上的双中值函数,则实数
的取值范围是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f030c36bb8786df88d401792062a4100.png)
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A.![]() | B.![]() | C.![]() | D.![]() |
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