如图,在平面直角坐标系
中,一次函数
(
为常数)的图像与
轴交于点
,与
轴交于点
,以直线
为对称轴的抛物线![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
,
,
为常数,且
)经过
、
两点,并与
轴的正半轴交于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/6/3ebec5e8-28ea-4bd0-8cf2-0d5f56fcf5c3.png?resizew=160)
(1)求
的值及抛物线的函数表达式;
(2)若
是抛物线对称轴上一动点,
周长最小时,求出
的坐标;
(3)是否存在抛物线上一动点
,使得
是以
为直角边的直角三角形?若存在,求出点
的横坐标;若不存在,请说明理由;
(4)在(
)的条件下过点
任意作一条与
轴不平行的直线交抛物线于
,
两点,试问
是否为定值,如果是,请直接写出结果,如果不是请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f2beb91f10d2d8f2aa0dcc3f5cd1598.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bf9ebc750f290b4efbe91f3477967fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b42fa51cf2cfb364431cfba5d138ed84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/679353e656a54993c041ebd39ec7b31b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66c6ecdf8ced933e8e6657196acc924f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20849c00c47cbdc43f18d53341b6c4e5.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/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/6/3ebec5e8-28ea-4bd0-8cf2-0d5f56fcf5c3.png?resizew=160)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65fbd5e25a4186845a78a9aadd8d4582.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(3)是否存在抛物线上一动点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48fd22ae0d5cc1497816bbb86dde0652.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
(4)在(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b70b32e7c9d83d0e7e09c0f3c3f676d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93895f814f136d8fda3353e1dbe5aaba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/925f199d8da7f999f50bd7f86c781631.png)
更新时间:2016-12-05 19:59:23
|
相似题推荐
解答题-问答题
|
困难
(0.15)
【推荐1】如图,在平面直角坐标系中,
是原点. 直线
与
轴、
轴分别交于
,
两点,抛物线
经过点
,与
轴的另一个交点为
,与
轴交于点
.
(2)点
是直线
上的一个动点,设点
的横坐标为
,
①若
的面积为
,求
关于
的函数表达式;
②在直线
上取
,
在
的左侧,在直线的下方作正方形
,求正方形与抛物线有两个交点时
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4a887d11303e00bbbaa7b88b6ce6d04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.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/bc79790bc6b08088748e0a89ca9d3b15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e32e92c2d8b3ef1696837086314c86fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4a887d11303e00bbbaa7b88b6ce6d04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dddb32a7a5c157fdf8aa049b2d665b4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
②在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4a887d11303e00bbbaa7b88b6ce6d04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37a987f49129d340bebe1ae2b5a9f611.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/389bc3f29c058067e06e0d0d2be399da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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解题方法
【推荐2】如图1,已知抛物线
与
轴相交于
、
两点(
点在
点的左侧),与
轴相交于
点,且
.
![](https://img.xkw.com/dksih/QBM/2020/5/14/2462628446568448/2463441014366208/STEM/7517a932c2a24142b7b25918db64f602.png?resizew=632)
(1)求这条抛物线的解析式;
(2)如图2,
点在
轴上,且在
点的右侧,
点为抛物线上第二象限内的点,连接
交抛物线于第二象限内的另外一点
,点
到
轴的距离与点
到
轴的距离之比为
,已知
,求点
的坐标;
(3)如图3,在(2)的条件下,点
由
出发,沿
轴负方向运动,连接
,点
在线段
上,连接
,
,过点
作
,与抛物线相交于点
,若
,求点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0b289125a71b1f1233734f50424d24f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.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/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc34db5860990e51ba31edc8cdd077c2.png)
![](https://img.xkw.com/dksih/QBM/2020/5/14/2462628446568448/2463441014366208/STEM/7517a932c2a24142b7b25918db64f602.png?resizew=632)
(1)求这条抛物线的解析式;
(2)如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84783b6ba0f36789519816101a437f46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1051376b59981d5f98feb05a02aa0054.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
(3)如图3,在(2)的条件下,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7e4fa04825ac7d071968056322d88be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08df20ad96494417cb342ea03fe9175e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec24d20c7fa5283efe20a5b2df43a523.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3834d7ec7531f3c3c0ce9b286f7a49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4501e87ec8fa06296ed15485230fef1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3834d7ec7531f3c3c0ce9b286f7a49.png)
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【推荐3】在平面直角坐标系中,抛物线
与
轴交与
两点,与
轴正半轴交于
点,且A
∶
(2)如图1,作矩形
,使
过点
,点
是
边上的一动点,连接
,作
交
于点
.设线段
的长为
,线段
的长为
,当
点运动时,求
与
的函数关系式并写出自变量
的取值范围.在同一直角坐标系中,试函数的图象与(1)DE的抛物线中
的部分有何关系?
(3)如图2,在(1)的抛物线中,点
其顶点,
为抛物线上一动点(不与
重合),取点
,作
且
(点M,N,L按逆时针顺序)当点L在抛物线上运动时,直线
是否存在某种确定的位置关系?若存在写出你的证明结论;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d447fa2b2dc03bbb4320515886d86e00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ae6f48b9a53c0155a692509cf31f7e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7eef368450c8b07bd9ce4c5e1499f6f4.png)
(2)如图1,作矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a429fe99ecd3c79ce1ad5548def2933f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcdae78f4d3b8d8213ac3ac9a9567eb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.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/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc65d6eb9b63f96d80b54ec9893aee8d.png)
(3)如图2,在(1)的抛物线中,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c88d9142df6ba8e43c1a93bd04a1362.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30ecceb75be8d4fe129fa91f6e9a9809.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e52f70b82d5ae2d06b53e5e6ec32ffa2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cae2d88295f3c527c726f1ea7b08e3ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e13e0b256d2fc31da9474272d41276c.png)
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困难
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名校
【推荐1】如图,抛物线y=ax2+bx+4交x轴于点A(﹣1,0)、B(4,0),交y轴于点C,点P是直线BC上方抛物线上的一点.
![](https://img.xkw.com/dksih/QBM/2022/2/24/2923424499965952/2927555873136640/STEM/427150a36306486faa857498ec911251.png?resizew=427)
(1)求抛物线的解析式;
(2)求△PBC的面积的最大值以及此时点P的坐标;
(3)在(2)的条件下,将直线BC向右平移
个单位得到直线l,直线l交对称轴右侧的抛物线于点Q,连接PQ,点R为直线BC上的一动点,请问在平面直角坐标系内是否存在一点T,使得四边形PQTR为菱形,若存在,请直接写出点T的坐标;若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/2022/2/24/2923424499965952/2927555873136640/STEM/427150a36306486faa857498ec911251.png?resizew=427)
(1)求抛物线的解析式;
(2)求△PBC的面积的最大值以及此时点P的坐标;
(3)在(2)的条件下,将直线BC向右平移
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d297eab7380f6a28ec010218d9ab4ba1.png)
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名校
【推荐2】如图,直线
与双曲线
交于
,
两点,点
的坐标为
,点
是双曲线第一象限分支上的一点,连接
并延长交
轴于点
,且
.
(1)求
的值并直接写出点
的坐标;
(2)点
是
轴上的动点,连接
,
,求
的最小值;
(3)点
是直线
上一个动点,是否存在点
,使得
与
相似,若存在,求出此时点
的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a02430f83e4f662e788d234da3c56ce2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45bd7e92dae1e0c2af6c33d5e202f544.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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13b50a900e18fec66f83b28c85d15cab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.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/510634e49198fc429d942d00fa5446ab.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/7/02b35227-7e01-466e-a174-62bd190a4acc.png?resizew=325)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4083c581c6027c4b2ae7e3b3749f485.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8e5f736b1195fef1d2d300168a795f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683f81d1f487d8dd6d965f11fb1bd8fb.png)
(3)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebb49c1fd097c5aafc0c9080449f5fc5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acee03d4bb4667b6c345221b6c9b0fa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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【推荐1】如图,二次函数
的图象交x轴于
、
两点,交y轴于点C,连接
.
(1)求二次函数的解析式;
(2)如图1,点E是直线
下方抛物线上的一动点,过点E作
轴交
于点G,作
于点F,求
周长的最大值及此时点E的坐标;
(3)如图2,动点P以每秒1个单位长度的速度从A向B运动,动点Q以每秒
个单位长度的速度从B向C运动,P、Q同时出发,连接
,当点Q到达C点时,P、Q同时停止运动,设运动时间为t秒.当
时,延长
交y轴于点M,在抛物线上是否存在一点N,使得
的中点恰为
的中点?若存在,求出点N的坐标与t的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22e59da5115d0dafea24822245f92c48.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/22/a6b5b812-79bf-406e-b8a7-a9f1c57d75e4.png?resizew=314)
(1)求二次函数的解析式;
(2)如图1,点E是直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb84cdbf19fbffb5c5b836827ebb4874.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58cc90fee532e50d319081d571410421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36e5e61804ce550636a0354e0a78a22d.png)
(3)如图2,动点P以每秒1个单位长度的速度从A向B运动,动点Q以每秒
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e1961f45e9de6198a9d5807a004de92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f6927cc2a930203ac34366383e76ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
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真题
名校
【推荐2】如图,抛物线
的图象经过
,
,
三点,且一次函数
的图象经过点
.
(1)求抛物线和一次函数的解析式.
(2)点
,
为平面内两点,若以
、
、
、
为顶点的四边形是正方形,且点
在点
的左侧.这样的
,
两点是否存在?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.
(3)将抛物线
的图象向右平移
个单位长度得到抛物线
,此抛物线的图象与
轴交于
,
两点(
点在
点左侧).点
是抛物线
上的一个动点且在直线
下方.已知点
的横坐标为
.过点
作
于点
.求
为何值时,
有最大值,最大值是多少?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/204696a289b1f47a176eb16c1cecf8b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b078585c75524673305d270e9eefab89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e894101c52591ac320eed1c9b452f30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c83ebc472717d6ddeeeabeb6dff738a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/170785d8eaffa7cb618e52c4580e95fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/29/358238ae-5742-4f77-ab8d-ee3e304bdeae.png?resizew=549)
(1)求抛物线和一次函数的解析式.
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
(3)将抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/204696a289b1f47a176eb16c1cecf8b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3304e23f3b0f9569c4140ca89b6498.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46f6872ffb1934339c53c2c2282d5889.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46f6872ffb1934339c53c2c2282d5889.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dafebaaf13781120dc57c277d0267c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/397dab2cc39244e41e1744214cccb204.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f1a19786fab29c8db90e83a331a04b0.png)
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解题方法
【推荐1】如图,在平面直角坐标系xOy中,已知Rt△ABC的直角顶点C(0,12),斜边AB在x轴上,且点A的坐标为(﹣9,0),点D是AC的中点,点E是BC边上的一个动点,抛物线y=ax2+bx+12过D,C,E三点.
(1)当DE∥AB时,
①求抛物线的解析式;
②平行于对称轴的直线x=m与x轴,DE,BC分别交于点F,H,G,若以点D,H,F为顶点的三角形与△GHE相似,求点m的值.
(2)以E为等腰三角形顶角顶点,ED为腰构造等腰△EDI,且I点落在x轴上.若在x轴上满足条件的I点有且只有一个时,请直接写出点E的坐标.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/10/6b294e3d-ef03-44e9-8eef-4d349549ce8f.png?resizew=230)
(1)当DE∥AB时,
①求抛物线的解析式;
②平行于对称轴的直线x=m与x轴,DE,BC分别交于点F,H,G,若以点D,H,F为顶点的三角形与△GHE相似,求点m的值.
(2)以E为等腰三角形顶角顶点,ED为腰构造等腰△EDI,且I点落在x轴上.若在x轴上满足条件的I点有且只有一个时,请直接写出点E的坐标.
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【推荐2】如图,抛物线
经过
三点,已知![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b075fb7cf7b6738a1a7327483058a631.png)
![](https://img.xkw.com/dksih/QBM/2020/5/4/2455667316211712/2456227928506368/STEM/0347504a-3c6f-4430-9469-562f58790183.png)
求此抛物线的关系式;
设点
是线段
上方的抛物线上一动点,过点
作
轴的平行线,交线段
于点
当
的面积最大时,求点
的坐标;
点
是抛物线上的一动点,当
中
的面积最大时,请直接写出使
的点
的坐标
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d96dde9c4aad0536c069127df0d4b12f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b075fb7cf7b6738a1a7327483058a631.png)
![](https://img.xkw.com/dksih/QBM/2020/5/4/2455667316211712/2456227928506368/STEM/0347504a-3c6f-4430-9469-562f58790183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f58058d0da4487ac359708f25d849674.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f53190d6ead827a6338b9de847aeaf1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e3ad66cf49d46fe39be15f5c23eec68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/357265c532428e886a643e8e653eec9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f62295c36d2e2174908c2bec0eb5b30f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f53190d6ead827a6338b9de847aeaf1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/357265c532428e886a643e8e653eec9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fae41a64ee03ba9863e7d6000e4cd2fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
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