如图,在平面直角坐标系中.直线y=﹣x+3与x轴交于点B,与y轴交于点C,抛物线y=ax2+bx+c经过B,C两点,与x轴负半轴交于点A,连结AC,A(-1,0)
(1)求抛物线的解析式;
(2)点P(m,n)是抛物线上在第一象限内的一点,求四边形OCPB面积S关于m的函数表达式及S的最大值;
(3)若M为抛物线的顶点,点Q在直线BC上,点N在直线BM上,Q,M,N三点构成以MN为底边的等腰直角三角形,求点N的坐标.
(1)求抛物线的解析式;
(2)点P(m,n)是抛物线上在第一象限内的一点,求四边形OCPB面积S关于m的函数表达式及S的最大值;
(3)若M为抛物线的顶点,点Q在直线BC上,点N在直线BM上,Q,M,N三点构成以MN为底边的等腰直角三角形,求点N的坐标.
![](https://img.xkw.com/dksih/QBM/2018/1/17/1862377742712832/1865890909028352/STEM/7f12ec78f8394e438760304481d2c693.png?resizew=156)
更新时间:2018-01-22 15:07:41
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【知识点】 特殊三角形问题(二次函数综合)
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解答题-应用题
|
较难
(0.4)
【推荐1】如图,在平面直角坐标系中,抛物线
交
轴于点A,交
轴于点
和点
,连接
、
、
,
与
轴交于点
.
(2)点
,点
在
轴上,点
在平面内,若
,且四边形
是平行四边形.
①求点
的坐标;
②设射线
与
相交于点
,交
于点
,将
绕点
旋转一周,旋转后的三角形记为
,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ceba6b11658f2cc227b1f550ba25c3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dde32eac58a246c6813f0802ea91987c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5eae074b97ec3ff58fbd9d556aea81f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d454c82d9e52747563d47b68099249.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb6ede9761b5b90f8dc137708e1ee90f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb6ede9761b5b90f8dc137708e1ee90f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8623aa8133f8e6cbcdd718bdfaddf9ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f62816d56337e48d1cd6238af120542.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/213c82fa2074e9366a3b9dbe63ff7890.png)
①求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
②设射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7785afeeaf274892253d04b4f693b367.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d910673b435e0fe48840f10fa17c6c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab6c5d130ca443a1accadee6b87b3e3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/169e8c8b75643c5e62370454b9bcb114.png)
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解答题-问答题
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较难
(0.4)
【推荐2】已知在平面直角坐标系中,二次函数
与x轴交于A、B两点(点A在点B左侧),与y轴交于点C,
.
![](https://img.xkw.com/dksih/QBM/2022/4/29/2968651978530816/2974108321497088/STEM/7bd8f22b-f842-4283-af77-9f553ad74d13.png?resizew=555)
(1)求这个二次函数的解析式;
(2)如图1,点P为直线
下方抛物线上的一个动点,过点P作
轴交直线
于点D,过点P作
交x轴于点E,求
的最大值及此时点P的坐标;
(3)如图2,将抛物线沿射线
方向平移
个单位,得到新抛物线
,点F为
的对称轴上任意一点,若以点B、C、F为顶点的三角形是直角三角形,请直接写出符合条件的点F的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/392fa642cd917509372a926ae1833cd5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ae3cc6f398d0cb044c9c330ed5fcccf.png)
![](https://img.xkw.com/dksih/QBM/2022/4/29/2968651978530816/2974108321497088/STEM/7bd8f22b-f842-4283-af77-9f553ad74d13.png?resizew=555)
(1)求这个二次函数的解析式;
(2)如图1,点P为直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d73a38b2b88a7fb833ce6d2ad0e54b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0b73db43b2ded725b5ec0fde022b32c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1979be66dc69edef881704887dfbc195.png)
(3)如图2,将抛物线沿射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2d52429c8324350309f77e7209a5c35.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b4d2174f411d9db6ab7b2aea47818cb.png)
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