已知
满足:
,且方程
有两相等的实数根.
(1)求
在区间
上的最大值.
(2)是否存在实数m、n,使得
在区间
上的最小值为4m,最大值为4n?若存在,求出m、n的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea89fb796dea0e3e7571530eaee85bbc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02e9a9ad236288e670ea7d944cf44e87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d3cc66b811ad2395efe04d93b61c711.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb6bfefa5b41faae17987876d570685d.png)
(2)是否存在实数m、n,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db527571cfd256c515424c6f9d114284.png)
23-24八年级下·北京·期中 查看更多[1]
(已下线)北京市清华大学附属中学创新班2023-2024学年八年级下学期期中数学试题
更新时间:2024-05-02 13:48:13
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【推荐1】若关于x的一元二次方程
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【推荐2】关于
的一元二次方程
有两个不相等的实数根.
(1)求
的取值范围;
(2)若
为不大于
的整数,且方程的根为整数,求满足条件的
的值及对应的方程的根.
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a4604296bc7c6ceffcc4c97e5e9412b.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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【推荐1】如图,抛物线:
的图像与
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两点,与
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轴交于点
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![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/9/9a411746-41df-4c23-8115-57449867dd33.png?resizew=164)
(1)求抛物线的解析式和
点坐标;
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轴上是否存在点
,使得以
、
、
为顶点的三角形与
相似,若存在,直接写出点
的坐标:若不存在,试说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22e59da5115d0dafea24822245f92c48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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(1)求抛物线的解析式和
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【推荐2】如图,已知抛物线
与x轴交于点A,C(点A在点C的右边),与y轴交于点B,
.
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(2)当
时,求二次函数
的最大值与最小值的差;
(3)点P为抛物线上任意一点,将点P向上平移2个单位长度得到点
,若点
关于原点O的对称点
恰好落在抛物线上,请直接写出此时点P的坐标.
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【推荐1】某水果超市经销一种高档水果,进价每千克40元.
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(1)若按售价为每千克50元,每天可售出500千克,经市场调查发现,在进货价不变的情况下,超市决定采取适当的涨价措施,但超市规定每千克涨价不能超过8元,若每千克涨价1元,日销售量将减少20千克.现该超市希望每天盈利6000元,那么每千克应涨价多少元?
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解答题-证明题
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【推荐2】矩形
的边长
,点E在
上,把
沿
折叠,使点B落在
边的点F处,
.
![](https://img.xkw.com/dksih/QBM/2023/9/12/3323445521252352/3335387034755072/STEM/e3dea2d6409f4422b0d3aac354c0a71d.png?resizew=297)
(1)如图1,求
的长度;
(2)如图2,点N从点F出发沿
以每秒
的速度向点D运动,同时点P从点A出发沿
以每秒
的速度向点F运动,运动时间为t秒(
),过点P作
,于点M.
①请证明在N、P运动的过程中,四边形
是平行四边形;
②连接
,
,当t为何值时,
为直角三角形?
③连接
,
,记
的面积为S,用含t的代数式表示S,求出当t为何值时S取得最大值,并求出最大值.
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(1)如图1,求
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(2)如图2,点N从点F出发沿
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①请证明在N、P运动的过程中,四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83ca0aff24f47fa554ab1f72775fb27b.png)
②连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5845ffc7d1af9053b027cf9e726f5367.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d23b488f961d9fde37feb7f5c497c0d9.png)
③连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5845ffc7d1af9053b027cf9e726f5367.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1ed4c4e8edbd179f3fc38a6653f18c1.png)
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