已知抛物线
:
,且过点
.
(1)求抛物线
的函数表达式及其顶点坐标A;
(2)若抛物线G上两点
,
满足:对于
,
时,均有
成立,求出
的取值范围;
(3)直线
:
经过
,点
在直线
上运动,求
最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcce74c72f14ececf401f6d025120b9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0881f9baf27ac7a7faf3f2f34880fed5.png)
(1)求抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
(2)若抛物线G上两点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8198c3b302b3820e86763428eb1e91cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3463ced6030af957f13f9ba05b977c1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5065fb0dff897e9adcdf4a7a39b0745.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/847137c1aa4ca4f45148ab55143ebe6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df86b0da538701c08fb214608e062372.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(3)直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51a003a5de6ad7e02bbb63059b5fa818.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b42e471098a6e79f4d262532fa4f6ff8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b34d23fdd85008e78887c0a6a771bb77.png)
2023·广东广州·二模 查看更多[2]
更新时间:2023-06-06 16:55:21
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相似题推荐
解答题-问答题
|
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名校
【推荐1】如图,在平面直角坐标系中,抛物线
与x轴交于
,B两点(点A在点B的左侧),与y轴交于点C,连接BC,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/14/043c67a5-af21-4c7d-af12-0640752157df.png?resizew=298)
(1)求抛物线的解析式;
(2)点P为直线BC上方抛物线上(不与B,C重合)一点,连接PC,PB,AC,当
,求点P的坐标;
(3)将抛物线沿射线CB方向平移
个单位,点F是平移后新抛物线的顶点,M是y轴正半轴上一点,点N是平面内任意一点,当以A、F、M、N为顶点的四边形是菱形时,请直接写出所有符合条件的N点的坐标;并任选其中一个N点,写出求N点的坐标的过程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa719a1a18eba3a6e0508de82786f2d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/913f78382630e50543e5f7192cae3ed3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fb01d2b57580731c8b807ac8cffc8ba.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/14/043c67a5-af21-4c7d-af12-0640752157df.png?resizew=298)
(1)求抛物线的解析式;
(2)点P为直线BC上方抛物线上(不与B,C重合)一点,连接PC,PB,AC,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05daf426ce60ad6b155cbe23cfded8a8.png)
(3)将抛物线沿射线CB方向平移
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b87ecc72d8130ea6b4fe0512837345b.png)
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【推荐2】如图,在平面直角坐标系中,一次函数y=mx+n(m≠0)的图象与反比例函数
(k≠0)的图象交于第一、三象限内的A、B两点,与y轴交于点C,过点B作BM⊥x轴,垂足为M,BM=OM,OB=
,点A的纵坐标为4.
(1)求该反比例函数和一次函数的解析式;
(2)连接AO,求△AOB的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07854693dd2e33f66030d6106eb6e0ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95bacae35b6e16a0a33c2bdc6bc07df7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/17/1a4e1eb0-adb3-4098-b1f4-aad834f0415e.png?resizew=240)
(1)求该反比例函数和一次函数的解析式;
(2)连接AO,求△AOB的面积.
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【推荐1】如图1,在平面直角坐标系
中,已知抛物线
与
轴交于点
,
,与
轴交于点
,连接
.
(1)求抛物线的解析式
(2)
是直线
下方抛物线上的一点,连接
、
、
,
交
于
,
,求点
的坐标.
(3)如图2,若动直线
与抛物线交于
,
两点(直线
与
不重合),连接
,
,直线
与
交于点
.当
时,点
的横坐标是否为定值,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bd726a709fcbca1ddf826dca89d054f.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/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/23/328179bd-78e1-405f-9b08-d9a203aee516.png?resizew=445)
(1)求抛物线的解析式
(2)
![](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/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef49a3ca580a144cc65a609c167facc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef49a3ca580a144cc65a609c167facc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a51ded0e5267ed9be713926f0769598.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(3)如图2,若动直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.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/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/167d31eb8432b5c0364316e5048c23dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/167d31eb8432b5c0364316e5048c23dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8fb4b5afd9999b210f1bab1a0854d13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
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解答题-证明题
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(0.4)
真题
解题方法
【推荐2】如图,抛物线
与
轴交于除原点
和点
,且其顶点
关于
轴的对称点坐标为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/23/d2ab8787-670f-41f0-a89c-bb2badd873ac.png?resizew=199)
(1)求抛物线的函数表达式;
(2)抛物线的对称轴上存在定点
,使得抛物线
上的任意一点
到定点
的距离与点
到直线
的距离总相等.
①证明上述结论并求出点
的坐标;
②过点
的直线
与抛物线
交于
两点.证明:当直线
绕点
旋转时,
是定值,并求出该定值;
(3)点
是该抛物线上的一点,在
轴,
轴上分别找点
,使四边形
周长最小,直接写出
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.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/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fad20e2bc6576fc461419f8f138d26e7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/23/d2ab8787-670f-41f0-a89c-bb2badd873ac.png?resizew=199)
(1)求抛物线的函数表达式;
(2)抛物线的对称轴上存在定点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd24f3c4bc9f9a75d4b28630bb630d2b.png)
①证明上述结论并求出点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
②过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02d92c510c7a614077d2c1cf5f6ce190.png)
(3)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/458ee4d93e21ec4ded0a7635b1feeeaa.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/f6bce3d91ca23b86d8c6625f2632e437.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5c203fa789096869f098e7b024dae26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6bce3d91ca23b86d8c6625f2632e437.png)
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【推荐3】如图1,在平面直角坐标系中,抛物线
与
轴交于点
,
点
在点
的左侧
,交
轴于点
,点
的坐标为
,点
为抛物线的顶点,对称轴与
轴交于点
.
_________,点
的坐标是 _________;
(2)连接
,点
是线段
上一动点
点
不与端点
,
重合
,过点
作
,交抛物线于点
点
在对称轴的右侧
,过点
作
轴,垂足为
,交
于点
,点
是线段
上一动点,当
的周长取得最大值时,求![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c63d1febf25cdde83737a9afdca1f02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
的最小值;
(3)在(2)中,当
的周长取得最大值时,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c63d1febf25cdde83737a9afdca1f02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
取得最小值时,如图
,把点
向下平移
个单位得到点
,连接
,把
绕点
顺时针旋转一定的角度
,得到
,其中边
交坐标轴于点
.在旋转过程中,是否存在一点
,使得
?若存在,请直接写出所有满足条件的点
的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10e71461c5134339b5b54a80e588640f.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/7986887b83aab178ae991d8e4c2696e2.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/987517758fad59f6f695761deb2a5ebd.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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b473ca719ebceaad3ccf097bb944f938.png)
![](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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7277696e8d9f58c9ec28887783b317e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3182db896bc2462331796e2a6108363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3182db896bc2462331796e2a6108363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11d71379442f28c038d367d49422cf90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7a53d82f9d27fab1ca605732ec507bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/693a91d4dab6aa1dc59aba9b575ac5f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85e1b7c631060f098502c55d2726d586.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3182db896bc2462331796e2a6108363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6967ebd791092c62b4ef97924d91883.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2be2a5ced4241b715e4110885c6c77b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c63d1febf25cdde83737a9afdca1f02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4d260c4df7b0dc180af6980d21f3371.png)
(3)在(2)中,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2be2a5ced4241b715e4110885c6c77b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c63d1febf25cdde83737a9afdca1f02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4d260c4df7b0dc180af6980d21f3371.png)
![](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/18483c9c195ecd922772527fa85c0fcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/128147bd4834566a78b4e9d2a3b2139c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/883866e7cae237015ea63d0ece6b9a1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35a6ef33406256c8dcccc9a915c9d018.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a50876b3f3f74193245abaa84262ecee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f159bdf3e82d6b58ad696ed844ab6d5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f94a5ff197dc688cc8cd754154c152f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a42da28be159399514cc6179a96e34b.png)
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解答题-问答题
|
较难
(0.4)
名校
【推荐1】如图,已知对称轴为直线
的抛物线
与x轴交于A、B两点,与y轴交于点C,其中
.
(1)求抛物线的表达式和顶点坐标;
(2)当一元二次方程
有两个负根时,求c的取值范围;
(3)当
时,函数的最大值与最小值的差是一个定值,直接写出m的取值范围:______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef00713e73b8357cc7900144f5505bc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d8de071a9c22c96a59b172d76c127e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8748dc55e2f45bc37fc4d84d7310f79.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/19/6cf57085-b7a6-47ad-978d-a659fee39af5.png?resizew=182)
(1)求抛物线的表达式和顶点坐标;
(2)当一元二次方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/051ebc0e67c7182141ab5fb2f288b3d9.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7091c49074f62962862ba440a87802a.png)
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解答题-问答题
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较难
(0.4)
【推荐2】已知函数
(
,
为实数).
(
)当
,
取何值时,函数是二次函数.
(
)若它是一个二次函数,假设
,那么:
①它一定经过哪个点?请说明理由.
②若取该函数上横坐标满足
(
为整数)的所有点,组成新函数
.当
时,
随
的增大而增大,且
时是函数最小值,求
满足的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7564ab52efbaf9fc201999bbbe6ff0dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e09e5a94d85f21cd7ba70275f0300d8.png)
①它一定经过哪个点?请说明理由.
②若取该函数上横坐标满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3a122e9be314c439858ff1c8f57d228.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54015ff5b49e3283901da1291b6b921d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9b8b1a3061abfc01b629ba49ef245ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54015ff5b49e3283901da1291b6b921d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5072bef93b6845e3332a2b212e32b46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
您最近一年使用:0次
解答题-证明题
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较难
(0.4)
【推荐1】已知,
的弦
交于点
,连接
交
于点
.
(1)如图1,求证:
;
(2)如图2,过点
作
的直径
,若
,求证:
;
(3)如图3,在(2)的条件下,连接
,若
,求线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5c4cd264c97c1f261229925cc5a6761.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9585740db9515cff458341447fbb768.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38b6ddcbb7590e7166cef507e2b5dbeb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/21/6cb5327f-91b3-4c5e-9c74-efd2ff5a8f0a.png?resizew=510)
(1)如图1,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf08218fa1c933cf557368e15fdab9d3.png)
(2)如图2,过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e4c6b0869d7248b6c2f964718a67702.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b975d407d732fd7372751262226898a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
(3)如图3,在(2)的条件下,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a78abb4b37ce31f711fc7b95c2fb45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fda6aa14f49c45b19f851674802a2e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83ebffbdca89cc68c33706ab069fc6fb.png)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
【推荐2】已知抛物线y=ax2+bx+c经过点D(5,4),与x轴相交于A(﹣3,0),B(8,0)两点,与y轴交于点C,点P(m,n)是抛物线上位于直线AD上方的动点.
(2)如图1,连接AC、CD,
①求证:AD平分∠BAC;
②利用该图形可知,若sin2
=
,则cos
的值为 ;
(3)如图2,过点P作PQ⊥AD,垂足为Q,求PQ的最大值及此时点P的坐标.
(2)如图1,连接AC、CD,
①求证:AD平分∠BAC;
②利用该图形可知,若sin2
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e514bc1761deff47d27c1909c1906ab4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7294f5ae2a24ff42e84cd9773b2a7287.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e514bc1761deff47d27c1909c1906ab4.png)
(3)如图2,过点P作PQ⊥AD,垂足为Q,求PQ的最大值及此时点P的坐标.
您最近一年使用:0次