如图,已知二次函数
的图像经过点
.
(1)求该二次函数的表达式;
(2)点D是该二次函数图像上的一点,且满足
(O是坐标原点),求点D的坐标;
(3)点P是该二次函数图像上位于第一象限内的一动点,直线
分别交
、y轴于点E、F,若
、
的面积分别为
、
,是否存在点P,使得
.若存在,请求出点P的坐标,若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe6337d68cd5653767e3a1889b8b2e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff240d1ac55e8c4a6b53562b0a049013.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/7/01a082f4-5917-4fe1-9a1e-699755c97e46.png?resizew=168)
(1)求该二次函数的表达式;
(2)点D是该二次函数图像上的一点,且满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50a7636c1dc29709edb9a648007ca940.png)
(3)点P是该二次函数图像上位于第一象限内的一动点,直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad3cd61d00f89e68ccca2cac5c937783.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f2ea13010e2399194be2a681310543e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31dd78e9156dcf6db93f6cbcc5b43b14.png)
19-20九年级·江苏·期中 查看更多[2]
更新时间:2020-11-17 12:57:26
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相似题推荐
解答题-问答题
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解题方法
【推荐1】已知抛物线
的对称轴为直线
,且与
轴交于
、
两点.与
轴交于点
.其中A(1,0),
.
![](https://img.xkw.com/dksih/QBM/2022/4/27/2967206603816960/2970919880294400/STEM/fd84d613-888b-4f3e-96c8-f911fd5a16c4.png?resizew=579)
(1)求抛物线的解析式;
(2)若点
在抛物线上运动(点
异于点
).
①如图1.当
面积与
面积相等时.求点
的坐标;
②如图2.当
时,求直线
的解析式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/707ea658f3a9359f5740d5aab48f7948.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/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba5ff18d8ec5ddf875f967842b795cde.png)
![](https://img.xkw.com/dksih/QBM/2022/4/27/2967206603816960/2970919880294400/STEM/fd84d613-888b-4f3e-96c8-f911fd5a16c4.png?resizew=579)
(1)求抛物线的解析式;
(2)若点
![](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/5963abe8f421bd99a2aaa94831a951e9.png)
①如图1.当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a871db2bd253dec3d9e78fd567129a27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3c65edad25ddd666cdce0d7e5afefc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
②如图2.当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e66eb2774ad6313154a6b97d30b3245b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
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【推荐2】若两个二次函数图像的顶点、开口方向都相同,则称这两个二次函数为“同簇二次函数”.
(1)请写出两个为“同簇二次函数”的函数.
(2)已知关于
的二次函数
和
,其中
的图像经过点
,
与
为“同簇二次函数”,
①求
的值及函数
的表达式.
②如图点
和点
是函数
上的点,点
和点
是函数
上的点,且都在对称轴右侧,若
轴,
,求
的值.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/8/9bd8f3f6-1a60-4dce-94a2-6b9ed10d5922.png?resizew=178)
(1)请写出两个为“同簇二次函数”的函数.
(2)已知关于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3894090e897a561d9540059c65b9f475.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bb747e1670f80a29d8c4de38dbfae8e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54015ff5b49e3283901da1291b6b921d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3c9708ef0dc6d6f5dcf6596d3e4f6e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46f6872ffb1934339c53c2c2282d5889.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54015ff5b49e3283901da1291b6b921d.png)
①求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46f6872ffb1934339c53c2c2282d5889.png)
②如图点
![](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/54015ff5b49e3283901da1291b6b921d.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/46f6872ffb1934339c53c2c2282d5889.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf79a784c60e75896ea9ca560fb5d687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8af620f6d204d310d8e3f267fdd6c3f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b10517f770b668568191d1228f21eb30.png)
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解题方法
【推荐3】如图1,在平面直角坐标系中,抛物线y
x2bxc交x轴于点A,B,点B的坐标为(4,0),与y轴于交于点C(0,﹣2).
(1)求此抛物线的解析式;
(2)在抛物线上取点D,若点D的横坐标为5,求点D的坐标及∠ADB的度数;
(3)在(2)的条件下,设抛物线对称轴
交x轴于点H,△ABD的外接圆圆心为M(如图1),
①求点M的坐标及⊙M的半径;
②过点B作⊙M的切线交
于点P(如图2),设Q为⊙M上一动点,则在点Q运动过程中
的值是否变化?若不变,求出其值;若变化,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
(1)求此抛物线的解析式;
(2)在抛物线上取点D,若点D的横坐标为5,求点D的坐标及∠ADB的度数;
(3)在(2)的条件下,设抛物线对称轴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
①求点M的坐标及⊙M的半径;
②过点B作⊙M的切线交
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff5a2611484388f39c6c73d2d03d68b4.png)
![](https://img.xkw.com/dksih/QBM/2020/3/27/2428542666096640/2433732363968512/STEM/fda452c1930b471aa0b40d7aa87a3524.png?resizew=324)
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名校
【推荐1】在平面直角坐标系
中,已知抛物线
过点
.
(1)求该抛物线的顶点坐标;
(2)过该抛物线与
轴的交点作
轴的垂线
,将抛物线在
轴右侧的部分沿直线
翻折,其余部分保持不变,得到图形
,
,
是图形
上的点,设
.
①当
时,求
的值;
②若
,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f17f83a458c0042f4f1f9cb4d352236d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d328a0acd01136ca7c47f794f7860975.png)
(1)求该抛物线的顶点坐标;
(2)过该抛物线与
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84f80d2d8fdab20fde178c1604ef6367.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b00936ae771215bb5c73549841046895.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d381e340eb97efb15bb717576d1a0e76.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b22208bb4dd6a6506410bc440d749e92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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【推荐2】抛物线
与x轴交于A,B两点(点A在点B的左边),与y轴交于点C.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/29/866775f1-31c6-42f2-a203-31dcc8b812e7.png?resizew=199)
(1)求抛物线的对称轴;
(2)求证:不论a取何值,函数图象必过两个定点;
(3)如图,若
,点P是直线
(不与B,C重合)上一动点,过点P作x轴的垂线交抛物线于M点,连接
,将
沿
对折,如果点P的对应点N恰好落在y轴上,求此时点P的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e0c67b9a500191e8bcb79c424308d54.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/29/866775f1-31c6-42f2-a203-31dcc8b812e7.png?resizew=199)
(1)求抛物线的对称轴;
(2)求证:不论a取何值,函数图象必过两个定点;
(3)如图,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49c8dbc31b2e14067ef2f34b4e25f114.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbf1490f8bd695ad195aa1a52fe36373.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
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【推荐1】如图,直线
交
轴于点
,交
轴于点
,抛物线
经过
、
,与
轴交于另一点
,顶点为
.
(1)求抛物线对应函数表达式;
(2)过
点作射线
交直线
下方的抛物线上于点
,使
,求点
的坐标;
(3)作CG平行于
轴,交抛物线于点G,点H为线段CD上的点,点G关于
的平分线的对称点为点
,若
,求点
坐标及三角形
的面积.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/29/98f759ba-fb31-40a3-b1fc-87de1b9b1b1c.png?resizew=189)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/29/abfa9c78-51b3-4fed-bbf4-2afeef3b8f27.png?resizew=177)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c608def11fa0e2b34f05592ef1d11fd8.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/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1b47e7bf02b3ca16f7d96b9369e51a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(1)求抛物线对应函数表达式;
(2)过
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c76805974fefbe166b90d260e822ab5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
(3)作CG平行于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/527ba12c15182827768fdb327ca29869.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0d2160bdf7d093831e2c74a3b70e35e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b209bc11fe03d41029f2fd7e076bd27.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/29/98f759ba-fb31-40a3-b1fc-87de1b9b1b1c.png?resizew=189)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/29/abfa9c78-51b3-4fed-bbf4-2afeef3b8f27.png?resizew=177)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/29/d6db2051-ba4b-4b46-9328-0e674e62246d.png?resizew=193)
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【推荐2】如图①,抛物线
与x轴交于点A、
,与y轴交于点
,点D是抛物线上一点,过点D作y轴的平行线交直线
于点E,过点D、E作x轴的平行线交抛物线的对称轴于点G、F,设点D的横坐标为m.
(2)用含m的代数式表示
的长;
(3)当
,且四边形
是正方形时,求m的值;
(4)过点A作
的平行线交y轴于点H,如图②,当四边形
在直线
、
之间的部分的面积恰好是四边形
面积的一半时,直接写出m的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58d88bbd34102b55fa928e8ff83f0d52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/978afb1da6f1fec85e2b09eeb7ee6403.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76fc88ea5357b675c01e93c62fea338d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(2)用含m的代数式表示
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1464ddc459a7d19e2ff4e322c171e123.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2257da1e2425f2ea9ac7440f52659ff.png)
(4)过点A作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2257da1e2425f2ea9ac7440f52659ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2257da1e2425f2ea9ac7440f52659ff.png)
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