若关于x的二次函数y=a
+bx+c(a>0,c>0,a、b、c是常数)与x轴交于两个不同的点A(
,0),B(
,0)(0<
<
),与y轴交于点P,其图像顶点为点M,点O为坐标原点.
![](https://img.xkw.com/dksih/QBM/2015/7/3/1573862284394496/1573862290956288/STEM/8d89a497-0735-4b92-b351-766d4508d2aa.png?resizew=211)
(1)当
=c=2,a=
时,求
与b的值;
(2)当
=2c时,试问△ABM能否为等边三角形?判断并证明你的结论;
(3)当
=mc(m>0)时,记△MAB,△PAB的面积分别为S1,S2,若△BPO∽△PAO,且S1=S2,求m的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b0a89e3c30f6e4d4c5db4378b05d987.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec19b68e3add9d5bfcc6269a1855b87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec19b68e3add9d5bfcc6269a1855b87.png)
![](https://img.xkw.com/dksih/QBM/2015/7/3/1573862284394496/1573862290956288/STEM/8d89a497-0735-4b92-b351-766d4508d2aa.png?resizew=211)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec19b68e3add9d5bfcc6269a1855b87.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
2015·湖南长沙·中考真题 查看更多[2]
更新时间:2016-12-06 00:53:56
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相似题推荐
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【推荐1】如图,
的顶点
,
,直角顶点C在y轴的正半轴上,抛物线
经过A、B、C三点.
(2)动点P从点A出发以2个单位
的速度沿AB向点B运动,动点Q从点C出发以
个单位
的速度沿
向点B运动,当其中一点到达终点时,另一点也停止运动,连接
、
,当
的面积最大时,求点P的坐标及最大面积;
(3)如图2,过原点的直线与抛物线交于点E、F(点E在点F的左侧),点
,若设直线
的解析式为
,直线
的解析式为
,试探究:
是否为定值?若是,请求出定值;若不是,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0929421a6188c3122442866b0b85a5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/316ba5cbb31299d683ac6c7dd795db85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
(2)动点P从点A出发以2个单位
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d350be73afb4a57e820fb8a8cd618e4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2967337e3fcb228dded64ab0c41a17e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d350be73afb4a57e820fb8a8cd618e4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e87b2f781cafa7989d81f9bf8c42b150.png)
(3)如图2,过原点的直线与抛物线交于点E、F(点E在点F的左侧),点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ce5cb4a1b1115641577d3d2e9ec6acc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91f3956f008cc29ca4bae44a087d5427.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4599cb0236b9f3129115f77feccfb9ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0e57a13c665af88f326c9890072bf73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/010cefd3512994c2127ed6ac34922008.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fd1f0ace9ca0b79929e73af6c201c2e.png)
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【推荐2】在平面直角坐标系中,点A是抛物线
的顶点.
(1)当m=0时,求点A的坐标;
(2)若直线OA与x轴所成的夹角为45°,求m的值;
(3)将点
向右平移4个长度单位得到点Q,若抛物线与线段PQ只有一个公共点,求m的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e79bd3a41efb6856c1984228f31d4ee.png)
(1)当m=0时,求点A的坐标;
(2)若直线OA与x轴所成的夹角为45°,求m的值;
(3)将点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1b6f209d1a805437046ca6ef79dd.png)
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【推荐1】数学兴趣小组探究平面内横、纵坐标满足特定关系的动点的运动轨迹问题:
(1)组长提出问题:动点
随着t的变化形成的运动轨迹是什么?
甲同学的思考:t取3个特殊值得到3个点坐标,发现3点在一条直线上,可以利用待定系数法求出该直线的表达式;乙同学的思考:令
,
,通过消去t得到y与x的函数关系式.
______(填甲或乙)同学的方法更严谨,点
运动轨迹的函数表达式为______;
(2)如图,在平面直角坐标系中,已知点
,
,Q为坐标系内一点且
,点M从点A出发以每秒8个单位的速度沿x轴向左运动,同时点N从点O出发以每秒6个单位的速度沿y轴向上运动,点P是MN的中点,设运动时间为t.求点P的运动轨迹的函数表达式,并计算当
时PQ的最小值;
![](https://img.xkw.com/dksih/QBM/2023/5/27/3246866763276288/3248733433135104/STEM/787f5309da5b4fe896c1ac909f1660b0.png?resizew=163)
(3)老师给出坐标平面内两个动点:
,
.
丙学说:点T、K的运动轨迹都是直线;丁同学说:点T、K在运动过程中不可能重合;请你判断两人结论是否正确并说明理由.
(1)组长提出问题:动点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac8c1a983a410c080727fd1d4d1541d4.png)
甲同学的思考:t取3个特殊值得到3个点坐标,发现3点在一条直线上,可以利用待定系数法求出该直线的表达式;乙同学的思考:令
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ac1aa0dc7af14bac3389c2d635bee30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c517b5fcd79e6a89c955e3e1b33cddd.png)
______(填甲或乙)同学的方法更严谨,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac8c1a983a410c080727fd1d4d1541d4.png)
(2)如图,在平面直角坐标系中,已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e8fd1ce0df99890a2147191d6fe8961.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25ce8d4a9d432afe03a988ae2d49c28c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4285ae8617bd752bfc059caf65e4c1d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cbeede118c407a800b05757b9a1393e.png)
![](https://img.xkw.com/dksih/QBM/2023/5/27/3246866763276288/3248733433135104/STEM/787f5309da5b4fe896c1ac909f1660b0.png?resizew=163)
(3)老师给出坐标平面内两个动点:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b3435e109dbfc8cbd368b7af47f3b66.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/519c8e14a1c18b34341a49120a7e3423.png)
丙学说:点T、K的运动轨迹都是直线;丁同学说:点T、K在运动过程中不可能重合;请你判断两人结论是否正确并说明理由.
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【推荐2】对于关于x的方程x2+(2m﹣1)x+4﹣2m=0,求满足下列条件的m的取值范围,
(1)两个正根;
(2)有两个负根;
(3)两个根都小于﹣1;
(4)两个根都大于
;
(5)一个根大于2,一个根小于2;
(6)两个根都在(0,2)内;
(7)两个根有且仅有一个在(0,2)内;
(8)一个根在(﹣2,0)内,另一个根在(1,3)内;
(9)一个正根,一个负根且正根绝对值较大;
(10)一个根小于2,一个根大于4.
(1)两个正根;
(2)有两个负根;
(3)两个根都小于﹣1;
(4)两个根都大于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
(5)一个根大于2,一个根小于2;
(6)两个根都在(0,2)内;
(7)两个根有且仅有一个在(0,2)内;
(8)一个根在(﹣2,0)内,另一个根在(1,3)内;
(9)一个正根,一个负根且正根绝对值较大;
(10)一个根小于2,一个根大于4.
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【推荐1】如图,在
中,
,
,过C作直线
,B关于直线
的对称点为D,连接
,
,
,
与
的交点为E,设
.
,则请直接写出下列两个角的度数:
_______,
_______.
(2)随着α的变化,
的度数是否也发生变化,请说明理由;
(3)当
成为等腰三角形时,求α的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b57fdd2a3642716fcf5100011eb3ec88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4472448bf73d660afee2df89784eee8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/671fdac69c4951a72cc06f6d598044dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db90c0feb35aa54464f1303be9118f37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acb663fe83b1f7e93e13d91cc6460f9c.png)
(2)随着α的变化,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/868ff1350bd72625328c85c3097cd85e.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
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【推荐2】综合与实践:
已知:等边
.
上一点,
,交
于点E.可知
为______三角形.
【实践发现】如图②:D为线段
外一点,连接
,以
为一边作等边三角形
.连接
.猜想
与
数量关系为______,直线
与
相交所产生的交角中的锐角为______.
【深入探究】:D为线段
上一点,F为线段
延长线上一点,且
.
(1)特殊感知:当点D为
的中点时,如图③,猜想线段
与
的数量关系为______;
(2)特例启发:当D为
上任意一点,其余条件不变,如图④,猜想线段
与
的数量关系?并说明理由.
(3)拓展延伸:在等边三角形
中,点D在直线
上,点F在直线
上,且
.若
的边长为2,
,则
的长为______.
已知:等边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c436f108fd4921dae15ecff19270237e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
【实践发现】如图②:D为线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9a32bd7a1b78b5a0ec562c4025aea8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a03841966d8142fa4a4aed023e37931.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
【深入探究】:D为线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2e94399c4924cf2a862737a2825fe4d.png)
(1)特殊感知:当点D为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
(2)特例启发:当D为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
(3)拓展延伸:在等边三角形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2e94399c4924cf2a862737a2825fe4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0d5a2cd05e4476fc72271e8fdb59a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
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【推荐1】如图,抛物线
与坐标轴分别交于
,
,
三点,
是第二象限内抛物线上的一动点且横坐标为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/25/c02798c0-8ae5-45c1-b698-4ff454e2bdd8.png?resizew=272)
(1)求
点的坐标及直线
的解析式为_____________,_____________.
(2)连接
,交线段
于点
,求
的最大值;
(3)连接
,是否存在点
,使得
,若存在,求
的值.若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0166598f0094ea9011cf7bfba3a082cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/25/c02798c0-8ae5-45c1-b698-4ff454e2bdd8.png?resizew=272)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](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/dc46e24d1c9a93b7d17e5aae30b4db70.png)
(3)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/060318e9e57a9a4a610bc90b08a92800.png)
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【推荐2】如图,已知抛物线y=
x2+bx+c经过△ABC的三个顶点,其中点A(0,1),点B(-9,10),AC∥x轴,点P是直线AC下方抛物线上的动点.
(1)求抛物线的解析式;
(2)过点P且与y轴平行的直线l与直线AB、AC分别交于点E、F,当四边形AECP的面积最大时,求点P的坐标;
(3)当点P为抛物线的顶点时,在直线AC上是否存在点Q,使得以C、P、Q为顶点的三角形与△ABC相似,若存在,求出点Q的坐标,若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
(1)求抛物线的解析式;
(2)过点P且与y轴平行的直线l与直线AB、AC分别交于点E、F,当四边形AECP的面积最大时,求点P的坐标;
(3)当点P为抛物线的顶点时,在直线AC上是否存在点Q,使得以C、P、Q为顶点的三角形与△ABC相似,若存在,求出点Q的坐标,若不存在,请说明理由.
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