如图,若b是正数,直线
与y轴交于点A;直线
与y轴交于点B;抛物线
的顶点为C,且L与x轴的右交点为D.
(1)当
时,求此时L的对称轴与直线a的交点坐标;
(2)当点C在l下方时,求点C与l距离的最大值;
(3)设
,点
,
,
分别在l,a和L上,且
是
,
的平均数,求点
与点D之间的距离;
(4)在L和a所围成的封闭图形的边界上,把横、纵坐标都是整数的点称为“美点”,分别直接写出
和
时“美点”的个数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03dd9516e950db77818090da396b39f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38782aec8adb4b47358901393d335085.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d943ff75537e1a845ad933ec41fe1cd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/20/073b053a-0757-499c-8d0e-5816f483e448.jpg?resizew=147)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03837b3769eda7f0d3804cc5ad4a6d60.png)
(2)当点C在l下方时,求点C与l距离的最大值;
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efe8dc8e5def7d46b88535453ae1fd96.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/192ceb18f0c49b007dc01730ca006c94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/509ff39d8b62d4f546b4b87b092a13a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c828ed9e98dd0ff0b519115ba7ef6ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9314bd1d7a6e070f4f2428f9a321804e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54015ff5b49e3283901da1291b6b921d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46f6872ffb1934339c53c2c2282d5889.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9938230f82e91cf09f8157b532baaba.png)
(4)在L和a所围成的封闭图形的边界上,把横、纵坐标都是整数的点称为“美点”,分别直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/445164094e640a84be30b6ab4e33814a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87172e4c59914978397d12c08c9c4a16.png)
19-20九年级上·浙江·期中 查看更多[1]
(已下线)【新东方】2019年舟山定海二中九年级上期中数学试卷
更新时间:2020-08-29 19:43:20
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相似题推荐
解答题-问答题
|
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【推荐1】如图,在平面直角坐标系中,抛物线
的顶点为
.直线
与这条抛物线交于A、
两点.点
在这条抛物线上,点
的横坐标为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/5/e122acfb-fc2e-46fc-a767-5a488246e584.png?resizew=154)
(1)根据题意,这条抛物线与
轴的交点坐标为______.
(2)求这条抛物线的表达式.
(3)求
、
两点的坐标.
(4)若
为直线
上一点,且直线
轴.设
、
两点之间的距离为
,当
随
的增大而减小时,直接写出
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75929925842ca723b34647ccaa596cdf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5077dd5e584beda91f6e083c26036c42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1882d2f789de61b5b7e3ec952e13b99e.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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/5/e122acfb-fc2e-46fc-a767-5a488246e584.png?resizew=154)
(1)根据题意,这条抛物线与
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
(2)求这条抛物线的表达式.
(3)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(4)若
![](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/d2784a52c4da98dc9df661fc152fc29e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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解题方法
【推荐2】如图,抛物线
:
与
轴交于点
,顶点为点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/20/962c82e5-4e2e-4ae6-af16-7e652f739e0b.png?resizew=362)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/22/036ff006-8311-4bd7-988b-32529c68f3be.png?resizew=311)
(1)直接写出抛物线
的对称轴是______,用含
的代数式表示顶点
的坐标____;
(2)把抛物线
绕点
旋转
得到抛物线
(其中
),抛物线
与
轴右侧的交点为点
,顶点为点
.
①如图1,当
时,求
的值;
②若
,是否存在
为等腰三角形,若存在请求出
的值,若不存在,请说明理由;
③当四边形
为矩形时,请求出
与
之间的数量关系,并直接写出当
时矩形
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2eb7126dd3bcc096f98a993b7e2f26c.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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/20/962c82e5-4e2e-4ae6-af16-7e652f739e0b.png?resizew=362)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/22/036ff006-8311-4bd7-988b-32529c68f3be.png?resizew=311)
(1)直接写出抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(2)把抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b62769b7177ef4bc952dc1dd51d6b510.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfe639eab78eafd2d40ea70aa5d3f21d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be466586da8810ccfd811c59a747adb8.png)
![](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/acc290b44635265137fdf13146b6a6d9.png)
①如图1,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd876a2ed79c64bacc3e64b8ee92735e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e94f16d5ed858699bfea5039a7bf8ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a855335176fc36a15017f50a8561348.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
③当四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8d4ab45e8e8f0084d8d90a4c1233d86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65397f11ea8af736f38debadf420c4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8d4ab45e8e8f0084d8d90a4c1233d86.png)
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【推荐3】某高科技发展公司投资500万元,成功研制出一种市场需求量较大的高科技替代产品,并投入资金1500万元作为固定投资. 已知生产每件产品的成本是40元,在销售过程中发现:当销售单价定为120元时,年销售量为20万件;销售单价每增加10元,年销售量将减少1万件,设销售单价为
(元),年销售量为
(万件),年获利为
(万元)。(年获利=年销售额—生产成本—投资)
(1)试写出
与
之间的函数关系式;
(2)请通过计算说明,到第一年年底,当
取最大值时,销售单价
定为多少?此时公司是盈利了还是亏损了?
![](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/e81e59019989b7dc2fb59b037ef6e010.png)
(1)试写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e81e59019989b7dc2fb59b037ef6e010.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)请通过计算说明,到第一年年底,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e81e59019989b7dc2fb59b037ef6e010.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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名校
【推荐1】如图1,在平面直角坐标系中,抛物线与x轴交于
、B两点,与y轴交于点C,顶点D的坐标为
.
(1)求抛物线的解析式;
(2)已知直线l:y=
x与抛物线交于E、F两点(点E在F的左侧),点G为线段
上的一个动点,过G作y轴的平行线交抛物线于点H,求
的最大值及此时点G的坐标;
(3)在(2)的条件下,如图2,若点G是
的中点,将
绕点O旋转,旋转过程中,点B的对应点为
、点G的对应点为
,将抛物线沿直线
的方向平移(两侧均可),在平移过程中点D的对应点为
,在运动过程中是否存在点
和点
关于△ABF的某一边所在直线对称(
与
不重合),若存在,请直接写出点
的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/448c0a5ee776d19ce8e42ac9a5fd27c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20660e49954f09601cbf528a7f436fca.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/4/b4ac6f2d-ad23-488b-b99a-b2b80ed3836b.png?resizew=540)
(1)求抛物线的解析式;
(2)已知直线l:y=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b2a698891d42c70b597f0da4f215f09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b6024bd977eae407b79172b4659a312.png)
(3)在(2)的条件下,如图2,若点G是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cec2af6f089b9bf6214b751b59ffc38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81722445de00f3cfcc3cb97e45b0d8dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5b3bd5e6bc2a0a277d279bb01af9584.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5b3bd5e6bc2a0a277d279bb01af9584.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5b3bd5e6bc2a0a277d279bb01af9584.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
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【推荐2】已知抛物线
(a,c为常数,
)经过点
,顶点为D.
(1)当
时,求该抛物线的顶点坐标;
(2)当
时,点
,
,求该抛物线的解析式;
(3)当
时,点
,过点C作直线l平行于x轴,
是x轴上的点,
是直线l上的动点.当a为何值时,
的最小值为
?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d039de5bf810e3ff6b0b6096fa48d462.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20849c00c47cbdc43f18d53341b6c4e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38f5eb173fa6534e98075c3b27074837.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a88212ed1d0eb4f3b349dcbabc1de7f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcb272c01f09449bec3d68e54967fa94.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3002ad1638f25e355d70d5ab63e637f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/477e0a99dc22f27aac991a8ea3363479.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7143fa23579131133e86e96baa01e8fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9322b99ec120d1374c3bef678d1f8c6b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a94ac1ce167fd74b30ae2012c3791a7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa82a15632a545ce2cc6dc998899807.png)
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【推荐3】如图1,直线y=2x+2交x轴于点A,交y轴于点C,过A、C两点的抛物线
与x轴的另一交点为B.
![](https://img.xkw.com/dksih/QBM/2022/6/1/2992097166319616/2994237051682816/STEM/e0cdf2b1-d93a-4e32-a79a-68de52b308fa.png?resizew=688)
(1)求该抛物线的函数表达式;
(2)如图2,点D是抛物线在第一象限内的一点,连接OD,将线段OD绕O逆时针旋转90°得到线段OM,过点M作MN∥x轴交直线AC于点N.求线段MN的最大值及此时点D的坐标;
(3)在(2)的条件下,若点E是点A关于y轴的对称点,连接DE,试探究在抛物线上是否存在点P,使得∠PED=45°?若存在,求出点P的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c1a89c495be618bca7c4e6af85ba8ec.png)
![](https://img.xkw.com/dksih/QBM/2022/6/1/2992097166319616/2994237051682816/STEM/e0cdf2b1-d93a-4e32-a79a-68de52b308fa.png?resizew=688)
(1)求该抛物线的函数表达式;
(2)如图2,点D是抛物线在第一象限内的一点,连接OD,将线段OD绕O逆时针旋转90°得到线段OM,过点M作MN∥x轴交直线AC于点N.求线段MN的最大值及此时点D的坐标;
(3)在(2)的条件下,若点E是点A关于y轴的对称点,连接DE,试探究在抛物线上是否存在点P,使得∠PED=45°?若存在,求出点P的坐标;若不存在,请说明理由.
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