如图,抛物线
与x轴交于点
、点B与y轴相交于点
,下列结论:①
;②B点坐标为
;③抛物线的顶点坐标为
;④直线
与抛物线交于点D、E,若
,则h的取值范围是
;⑤在抛物线的对称轴上存在一点Q,使
的周长最小,则Q点坐标为
.其中正确的有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58d88bbd34102b55fa928e8ff83f0d52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aee6f55f5de53781cc0e1c61f9fc5995.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25c43f704b5d150cb4e29e9796a07d80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f06408895febc126c2ae409e807349c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7267f12d61e2e4c373e1407c05d3610.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/496a7240c134e06a068495c583f8b247.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62febf1db3a4e0e989fca82391989829.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77d37dd8b4de4d89fa1fbdbea364a638.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/938bd055cd0beb7d1cb07d8387175701.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82bc4b926b29e58400df99ebf5771404.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9d51b51352854f7a88f7f3619ba5be3.png)
A.![]() | B.![]() | C.![]() | D.![]() |
更新时间:2022-12-11 11:45:16
|
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【推荐1】将函数
在
轴下方的图像沿
轴向上翻折,在
轴上方的图像保持不变,得到一个新图像.若使得新图像对应的函数最大值与最小值之差最小,则
的值为( )
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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A.2.5 | B.3 | C.3.5 | D.4 |
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【推荐2】已知抛物线
上部分点的横坐标x纵坐标y对应值如表:
以下说法不正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aecff2b807315608e925d1e5c6a63a1d.png)
x | …… | ﹣1 | 0 | 1 | 2 | 3 | …… |
y | …… | 0 | ﹣3 | ﹣4 | ﹣3 | m | …… |
A.![]() |
B.![]() |
C.方程![]() ![]() ![]() ![]() |
D.函数![]() ![]() ![]() |
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【推荐1】在平面直角坐标系中有两点
、
,若二次函数
的图象与线段
只有一个交点,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e6c8170dd3ad55d366c866dfa21c7df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5590337b3868db8523eeb7f448efcf05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8804533eb534befa584fac15b8904ed3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
A.a的值可以是![]() | B.a的值可以是![]() |
C.a的值不可能是![]() | D.a的值不可能是1 |
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【推荐2】抛物线y=x2-6x+n经过A(x1,y1),B(x2,y2),C(x3,y3)三点,且x1<x2<x3,|x1|=|x3|,x2+x3>6,则下列关于y1,y2,y3的大小关系的结论正确的是( )
A.y1>y3>y2 | B.y3>y2>y1 |
C.y1>y2>y3 | D.y2>y3>y1 |
您最近一年使用:0次
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【推荐1】已知开口向下的抛物线
经过点
,且对称轴为直线
,有下列结论:①
;②
;③若方程
有解
、
,满足
,则
,
;④抛物线与直线
交于P、Q两点,若
,则
或1.其中,正确结论的个数是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcbcd0aebdd8bd688d108834747009f5.png)
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A.4 | B.3 | C.2 | D.1 |
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解题方法
【推荐2】如图,在平面直角坐标系中,二次函数y=x2﹣2x+c的图象与x轴交于A、C两点,与y轴交于点B(0,﹣3),若P是x轴上一动点,点D(0,1)在y轴上,连接PD,则
PD+PC的最小值是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/5/efbb371a-2e4a-48fe-97ee-ed2b05a67493.png?resizew=171)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/5/efbb371a-2e4a-48fe-97ee-ed2b05a67493.png?resizew=171)
A.4 | B.2+2![]() | C.2![]() | D.![]() |
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