小刚在用描点法画抛物线
:
时,列出了下面的表格:
(1)请根据表格中的信息,写出抛物线
的一条性质: ;
(2)求抛物线
的解析式;
(3)将抛物线
先向下平移3个单位长度,再向左平移4个单位长度,得到新的抛物线
;
①若直线
与两抛物线
,
共有两个公共点,求
的取值范围;
②抛物线
的顶点为A,与
轴交点为点
,
(点
在点
左侧),点
(不与点A重合)在第二象限内,且为
上任意一点,过点
作
轴,垂足为
,直线
交
轴于点
,连接
,
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![]() | ![]() | 0 | 1 | 2 | 3 | 4 | ![]() |
![]() | ![]() | 3 | 6 | 7 | 6 | 3 | ![]() |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
(2)求抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
(3)将抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
①若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87490be8d0cdb7bc6c39d1a37f3bc335.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
②抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.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/7f9e8449aad35c5d840a3395ea86df6d.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/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19f00d0ff8dd38da17167cf9b789eec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3525ddc5153fada64eaf14e50b536542.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b77dac8d9185105be114a0f1ffc594f0.png)
![](https://img.xkw.com/dksih/QBM/2022/4/18/2960914419384320/2961018405920768/STEM/138cefe0-8a40-4f66-a4a2-3afbc783b73a.png?resizew=580)
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更新时间:2022-04-18 21:10:16
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【推荐1】如图,在平面直角坐标系中,二次函数
的图象与直线
交于
、
两点,
,
,其中点
是抛物线
的顶点,交y轴于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/3/46ab9f0f-6122-482e-a1fa-27b9b0f197f7.png?resizew=214)
(1)求二次函数解析式;
(2)点
是抛物线第三象限上一点(不与点
、
重合),连接
,以
为边作正方形
,当顶点
或
恰好落在抛物线对称轴上时,直接写出对应的
点的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.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/69b8ebddc990511996b3eb12982f9bbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8760ff28f93b72775f3eec1f87f9d686.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/3/46ab9f0f-6122-482e-a1fa-27b9b0f197f7.png?resizew=214)
(1)求二次函数解析式;
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.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/cb6ede9761b5b90f8dc137708e1ee90f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb6ede9761b5b90f8dc137708e1ee90f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9914e2ef21027f63ef9c118b07cb07c2.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/acc290b44635265137fdf13146b6a6d9.png)
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名校
【推荐2】如图1,在平面直角坐标系中,直线
与
轴、
轴分别交于点
、
,点
为
轴负半轴上一点,
于点
交
轴于点
.已知抛物线
经过点
、
、
.
(1)求抛物线的函数式.
(2)连接
,点
在线段
上方的抛物线上,连接
、
,若
和
面积满足
,求点
的坐标.
(3)如图
,
为
中点,设
为线段
上一点(不含端点),连接
.一动点
从
出发,沿线段
以每秒
个单位的速度运动到
,再沿着线段
以每秒
个单位的速度运动到
后停止.若点
在整个运动过程中用时最少,请直接写出最少时间和此时点
的坐标.
![](https://img.xkw.com/dksih/QBM/2017/8/10/1748969304006656/1749616608059392/STEM/5a777ade2955473994aaf7e8dfa4578b.png?resizew=164)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.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/7291b3d921f595f28960abcdce6dfbed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62855ff21228ecea8e28fd0fbeb814ee.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/ed46a014ece6a0830c7c8b8deb2c56e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6158ceeaf5875314751a08e3f308bcf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.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)
(1)求抛物线的函数式.
(2)连接
![](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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff38e565770d5a49f3dca7be9863e6f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(3)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/735056c174e8dd7906257a2a50a962a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91e07104b699c4012be2d26160976a2.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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/2017/8/10/1748969304006656/1749616608059392/STEM/5a777ade2955473994aaf7e8dfa4578b.png?resizew=164)
![](https://img.xkw.com/dksih/QBM/2017/8/10/1748969304006656/1749616608059392/STEM/b2fa84b639a34f89a70beb56c09a8413.png?resizew=164)
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【推荐1】如图,二次函数
的图象交y轴于点C,点B与点C关于该二次函数图象的对称轴对称,已知一次函数
的图象经过该二次函数图象上的点
及点B.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/26/200c8c6d-a246-47e5-88d7-ac5fa8a0e9d2.png?resizew=142)
(1)求二次函数与一次函数的解析式.
(2)点P是该抛物线上一动点,点P从A点沿抛物线向B点运动(点P不与A、B重合),过点P作
轴,PD交直线AB于点D.请求出点P在运动的过程中,线段PD的长度的最大值以及此时点P的坐标;
(3)抛物线上是否存在点Q,使
,若存在,请直接写出点Q的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1640b052f2c40214a4004b0fe979f31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c15fb18163df0690365a0d2e7ee88f5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f911e0ed2429ab67c269cb0ff60ef218.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/26/200c8c6d-a246-47e5-88d7-ac5fa8a0e9d2.png?resizew=142)
(1)求二次函数与一次函数的解析式.
(2)点P是该抛物线上一动点,点P从A点沿抛物线向B点运动(点P不与A、B重合),过点P作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d73a38b2b88a7fb833ce6d2ad0e54b5.png)
(3)抛物线上是否存在点Q,使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88ef98a69ed12c2d97523a9847dc75d0.png)
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【推荐2】如图1,在平面直角坐标系中,抛物线
与x轴交于
两点(点A在点B左侧),与y轴交于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/5/02c69aad-e4c7-4f17-92e2-bce88e370713.png?resizew=377)
(1)求此抛物线的解析式;
(2)D为抛物线顶点,点P在抛物线的对称轴上(不与点D重合),将线段
绕点P按顺时针方向旋转
,点D恰好落在抛物线上的点Q处.求点Q的坐标;
(3)如图2,将抛物线
在x轴下方部分的图象沿x轴翻折到x轴上方,与原抛物线在x轴上方部分的图象组成新图象,再将新图象向左平移m个单位长度,若平移后的图象在
范围内,y随x的增大而增大,求m的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b369423a3633c9b87ba58102c12167e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da50ebd2656745259525c8b157e389e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7f8d62ae2d9870f1f4b5004d6609e0a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/5/02c69aad-e4c7-4f17-92e2-bce88e370713.png?resizew=377)
(1)求此抛物线的解析式;
(2)D为抛物线顶点,点P在抛物线的对称轴上(不与点D重合),将线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
(3)如图2,将抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b369423a3633c9b87ba58102c12167e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b6e80db7f2d705016809640d5c30dc1.png)
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【推荐1】二次函数y=a
+bx+c的图像如图所示,根据图像解答下列问题:
![](https://img.xkw.com/dksih/QBM/2021/3/1/2668609548640256/2671229347782656/STEM/1536a43684d646299f383bcc1cbed4b1.png?resizew=160)
(1)方程a
+bx+c=0的两个根为 ,不等式a
+bx+c>0的解集为 ;
(2)若关于x的一元二次方程a
+bx+c=k的两个不相等的实数根,则k的取值范围为 ;
(3)若关于x的一元二次方程a
+bx+c﹣t=0在1<x<4的范围内有实数根,求t的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f696ef3ca490eca447bfc0f04771c3df.png)
![](https://img.xkw.com/dksih/QBM/2021/3/1/2668609548640256/2671229347782656/STEM/1536a43684d646299f383bcc1cbed4b1.png?resizew=160)
(1)方程a
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f696ef3ca490eca447bfc0f04771c3df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f696ef3ca490eca447bfc0f04771c3df.png)
(2)若关于x的一元二次方程a
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f696ef3ca490eca447bfc0f04771c3df.png)
(3)若关于x的一元二次方程a
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f696ef3ca490eca447bfc0f04771c3df.png)
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【推荐2】已知二次函数
的图象对称轴为
,图象交x轴于A、B两点,交y轴于
,且
,直线
与二次函数图象交于M、N(M在N的右边),交y轴于P.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/11/8bd2585c-1516-4a79-9fec-42d89b78179c.png?resizew=292)
(1)求二次函数图象的解析式;
(2)若
,若M、N均在第一象限,且
的面积为
,求k的值;
(3)若
,且M在第四象限,若直线AN交y轴于Q,求
取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ad838beaf06922968c4404e5d26c782.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c052d7af2f98d95bac8725b608fba0fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f08273d339dc5ddbb89aa67bb8205e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ca03136f1b3ca6ef9fa397e5f055147.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/11/8bd2585c-1516-4a79-9fec-42d89b78179c.png?resizew=292)
(1)求二次函数图象的解析式;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/711b21672fd907c5c92fee1d649e7003.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12225a1a1eda07908309f8100cc34726.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ca42772282f7df1f5d5aa58ce432b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d186a4fcdb87120d5307fed9a100434d.png)
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解答题-问答题
|
较难
(0.4)
【推荐1】如图,已知扇形
的半径
,
,点
、
分别在半径
、
上(点
不与点
重合),联结
.点
是弧
上一点,
.
![](https://img.xkw.com/dksih/QBM/2021/5/10/2717991804657664/2727957049155584/STEM/2efa4ef7-a72f-471b-8ffb-3877b66d8fcf.png)
(1)当
,以
为半径的圆
与圆
相切时,求
的长;
(2)当点
与点
重合,点
为弧
的中点时,求
的度数;
(3)如果
,且四边形
是梯形,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a77343ecde1c2665df291761b6563.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6e3dfcd8aff269dd5aba398816490c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20ccc37b189fa2cbc269ca0b233dac37.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/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.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/9d78abbad68bbbf12af10cd40ef4c353.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/6ed66431681da1db8f7cb0f40cd19201.png)
![](https://img.xkw.com/dksih/QBM/2021/5/10/2717991804657664/2727957049155584/STEM/2efa4ef7-a72f-471b-8ffb-3877b66d8fcf.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e472641b795fa2fd93be40b54854fe4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(2)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.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/8407954a328c08add8decf551fa4340d.png)
(3)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85bdcc2742be52cc80ba7dbe79f9a574.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22bde5707e57ffcfde178897ebe06942.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ef3335bb9b8c4a67387e3dcce773765.png)
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解答题-问答题
|
较难
(0.4)
【推荐2】如图,已知
,抛物线
经过A、B两点,交y轴于点C.点P是第一象限内抛物线上的一点,点P的横坐标为m.过点P作
轴,垂足为点M,PM交BC于点Q.过点P作
,垂足为点N.
![](https://img.xkw.com/dksih/QBM/2022/4/22/2967781801058304/2990528699662336/STEM/d5ff2cc2-bf07-47a2-9f90-725d2f0b6141.png?resizew=621)
(1)求抛物线的函数表达式;
(2)请用含m的代数式表示线段PN的长,并求出当m为何值时PN有最大值,最大值是多少?
(3)连接PC,在第一象限的抛物线上是否存在点P,使得
?若存在,请直接写出m的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93126143dd73213bb958b8b13fc3759d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ceba6b11658f2cc227b1f550ba25c3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea3a3db6d96518255f96ad7fc1ac98f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3a6922808e9b59352c25c341cf23851.png)
![](https://img.xkw.com/dksih/QBM/2022/4/22/2967781801058304/2990528699662336/STEM/d5ff2cc2-bf07-47a2-9f90-725d2f0b6141.png?resizew=621)
(1)求抛物线的函数表达式;
(2)请用含m的代数式表示线段PN的长,并求出当m为何值时PN有最大值,最大值是多少?
(3)连接PC,在第一象限的抛物线上是否存在点P,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35e269185c79f012a42a1d990b9bbf12.png)
您最近一年使用:0次