已知,如图,二次函数y=ax2+2ax﹣3a(a≠0)图象的顶点为H,与x轴交于A、B两点(B在A点右侧),点H、B关于直线l:
对称.
(1)求A、B两点坐标,并证明点A在直线l上;
(2)求二次函数解析式;
(3)过点B作直线BK∥AH交直线l于K点,M、N分别为直线AH和直线l上的两个动点,连接HN、NM、MK,求HN+NM+MK和的最小值.
![](https://img.xkw.com/dksih/QBM/2011/8/8/1573236868136960/1573236908244992/STEM/a5f7ac9bd5f94014984b1cf85579aec7.png)
(1)求A、B两点坐标,并证明点A在直线l上;
(2)求二次函数解析式;
(3)过点B作直线BK∥AH交直线l于K点,M、N分别为直线AH和直线l上的两个动点,连接HN、NM、MK,求HN+NM+MK和的最小值.
![](https://img.xkw.com/dksih/QBM/2011/8/8/1573236868136960/1573236908244992/STEM/dc4171a544434a0da341f1eafb69d698.png)
2011·青海西宁·中考真题 查看更多[4]
(已下线)2011年初中毕业升学考试(青海西宁卷)数学(已下线)2011年初中毕业升学考试(福建福州卷)数学青岛版九年级下5.9用图象法解一元二次方程22015届浙江省金华四中九年级上学期10月月考数学试卷
更新时间:2019-01-30 18:14:09
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相似题推荐
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【推荐1】(1)如图1,在平面直角坐标系中,等腰
,
,
,AB与y轴交点D,点C的坐标为
,点A的坐标为
,则点B的坐标是______
(2)如图2,河道
与x轴、y轴分别相交于点A、点B,另一河道过点B交x轴于点
,市政府为了给市民提供一个放松身心,走进大自然的场所,规划在河道BC上选一点D,建一三角形的的湿地公园
,为了给大家更好的体验感,湿地公园要求
,请求出点D的坐标;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f76899b3a0bfbbdae7cb1148ad4bf018.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1803dc3c76fd2b51696647aa18602412.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b569572c8d9bf05d78d3ab741e68bb2.png)
(2)如图2,河道
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e091cface0c4a22727634eb480562d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca0b4afd16b79370532de44989d6c43d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd4c625a55ef1d2920a0605d52c8da23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c4cb73e9d976cbfe9c590044fa69dd5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/25/46c86550-1576-4b3f-9d13-1438a44504cf.png?resizew=403)
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【推荐2】如图,在平面直角坐标系中,直线
与y轴交于点C(0,6),与x轴交于点B.
(1)求这条直线的解析式;(2)直线AD与(1)中所求的直线相交于点D(
,n),点A的坐标为(
).
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/8/8538b333-4618-42c1-8256-1928d9d842a2.png?resizew=199)
①求n的值及直线AD的解析式;
②求△ABD的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8913cdc9937e2594a37bbeefcb9cce2f.png)
(1)求这条直线的解析式;(2)直线AD与(1)中所求的直线相交于点D(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acbc6a613224461ade69362d46550474.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/147f5826268b2310d7b504b2364317bf.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/8/8538b333-4618-42c1-8256-1928d9d842a2.png?resizew=199)
①求n的值及直线AD的解析式;
②求△ABD的面积.
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【推荐3】如图,在平面直角坐标系xOy中,直线
分别交x轴,y轴于A、B两点,点A关于原点O的对称点为点D,点C在第一象限,且四边形ABCD为平行四边形.
(1)在图①中,画出平行四边形ABCD,并直接写出C、D两点的坐标;
(2)动点P从点C出发,沿线段CB以每秒1个单位的速度向终点B运动;同时,动点Q从点A出发,沿线段AD以每秒1个单位的速度向终点D运动,设点P运动的时间为t秒.
①若△POQ的面积为3,求t的值;
②点O关于B点的对称点为M,点C关于x轴的对称点为N,过点P作PH⊥x轴,问MP+PH+NH是否有最小值,如果有求出相应的点P的坐标;如果没有,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71c682405d9bcca65e257ac37ba07d6d.png)
(1)在图①中,画出平行四边形ABCD,并直接写出C、D两点的坐标;
(2)动点P从点C出发,沿线段CB以每秒1个单位的速度向终点B运动;同时,动点Q从点A出发,沿线段AD以每秒1个单位的速度向终点D运动,设点P运动的时间为t秒.
①若△POQ的面积为3,求t的值;
②点O关于B点的对称点为M,点C关于x轴的对称点为N,过点P作PH⊥x轴,问MP+PH+NH是否有最小值,如果有求出相应的点P的坐标;如果没有,请说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/28/479a30dd-3f4c-4719-9835-507aabc22a2c.png?resizew=399)
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【推荐1】如图,顶点为M的抛物线
与x轴交于
,
两点,与y轴交于点C.
(1)求抛物线的表达式;
(2)求直线
表达式;
(3)在直线
的上方的抛物线上,有一点P(不与点M重合),使
的面积等于
的面积,请求出点P的坐标;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb2b3667adf59c4b60ac3b3e75dda2eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bf0225a1fd0aa0305a3b008b8406392.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b189d334cbb4501ad0dd011c4294387b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/27/98d6241b-882a-4a75-84c7-a3ef3a077c52.png?resizew=169)
(1)求抛物线的表达式;
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
(3)在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65fbd5e25a4186845a78a9aadd8d4582.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13bec6cc71fbc77b58d61f192164081b.png)
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【推荐2】如图,拋物线经过
三点.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/5/7f6a664d-3d17-4ed1-ad27-74c5858071a7.png?resizew=153)
(1)求出抛物线的解析式;
(2)若在直线
上方的抛物线上有一点
,使得
的面积最大,求出点
的坐标;
(3)若
是抛物线上一动点,过
作
轴,垂足为
,使得以
为顶点的三角形与
相似,请直接写出符合条件的点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49409479e860f39ebe701bfbda17cbf4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/5/7f6a664d-3d17-4ed1-ad27-74c5858071a7.png?resizew=153)
(1)求出抛物线的解析式;
(2)若在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b93f77fc658b1f307566bb05d6d629fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea3a3db6d96518255f96ad7fc1ac98f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9dac152e5e7d8f9549fbc04c1d42bbfa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/806fd60fb45a557b7f33fe601c919313.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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解答题-证明题
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解题方法
【推荐1】如图1,在等边
中,
,点D,E分别在边
上,
,连接
,点M,P,N分别为
的中点.
(1)观察猜想:图1中,线段
与
的数量关系是 ,
;
(2)探究证明:把
绕点A逆时针方向旋转到图2的位置,连接
,则上面题(1)中的两个结论是否依然成立,并说明理由;
(3)拓展延伸:把
绕点A在平面内自由旋转,若
,请直接写出
周长的最大值
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f73e49ce515d3b54ecc49634bac33153.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dec2ca6438c82b43f746057d8129885.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2d212c1709b8e72a055cf1b5381ef64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fe472bf6d3e045584151796135e017b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/28/1c769d8f-7979-4afe-ad0c-25eb81d67730.png)
(1)观察猜想:图1中,线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c8ffe24cf9f327aeb241225ab15ab1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ede1745e549ad66e2c9c4968cbc72e15.png)
(2)探究证明:把
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b9c31334f998f1c1effed527089bb9f.png)
(3)拓展延伸:把
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed187c673a12fa976ffdaea52bc1d911.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1ed4c4e8edbd179f3fc38a6653f18c1.png)
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【推荐2】我们把对角线互相垂直的四边形叫做垂美四边形.如图1,四边形
中对角线
于点
.所以四边形
是垂美四边形.
(1)在图1中,我们发现垂美四边形
的两组对边满足:
,请你证明这个结论;
(2)如图2,请你用(1)中的结论解决下面问题:分别以
的直角边
和斜边
为边向外作正方形
和正方形
,连接
,
,
.若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfc1f76257275ab4b04f9bc913535670.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/2/1b1eddb6-500d-4e57-8ea4-9e2f8342ba83.png?resizew=336)
(1)在图1中,我们发现垂美四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d20324c4262b72d72b6624ef90675827.png)
(2)如图2,请你用(1)中的结论解决下面问题:分别以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f76899b3a0bfbbdae7cb1148ad4bf018.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff7a0bfc593a8a33b6cade6ba213904c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad3a079cfdcca9acdacecbf08f9f78cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91f3956f008cc29ca4bae44a087d5427.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a7b5adfcac0f46a4cd19da4ebb4a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f08273d339dc5ddbb89aa67bb8205e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91f3956f008cc29ca4bae44a087d5427.png)
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【推荐1】如图,抛物线
与
轴交于
,
两点,过点
的直线
交抛物线于点
.
(1)求抛物线的解析式.
(2)点
是线段
上一个动点,过点
作
轴的垂线交抛物线于点
,求线段
最大时点
的坐标.
(3)点
是抛物线上的动点,在
轴的正半轴上是否存在点
,使得以点
,
,
,
为顶点的四边形是平行四边形?如果存在,请直接写出所有满足条件的点
的坐标;如果不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22e59da5115d0dafea24822245f92c48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0929421a6188c3122442866b0b85a5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08ef03f452410ab19c6246567c427178.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9316f8a58f503d0ea3879b8be30eaae.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/11/31deff83-ef41-4f3d-b322-ffd6e2bbe087.png?resizew=152)
(1)求抛物线的解析式.
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.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/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(3)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
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【推荐2】如图,二次函数
的图象与y轴交于点C,点B在抛物线上,且与点C关于抛物线的对称轴对称,已知一次函数
的图象经过该二次函数图象上的点
及点B.
(1)求二次函数与一次函数的解析式;
(2)在对称轴上找一点P,使
最小,求点P的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e389625b996348ce7c211910488d9c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c15fb18163df0690365a0d2e7ee88f5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0929421a6188c3122442866b0b85a5e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/14/fc315a21-9d5f-4ef5-9dd0-00836afafbe6.png?resizew=195)
(1)求二次函数与一次函数的解析式;
(2)在对称轴上找一点P,使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a51a8d10345f567e0f2daf18529d42f0.png)
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