1 . 如图,点
在
轴上,点
是抛物线
上的一个动点,连接
,取
的中点
.
(1)当点
在坐标轴上时,求点
的坐标.
(2)当点
在抛物线上运动时,
①猜想点
构成的曲线是什么求出此曲线的解析式,并在网格中画出大致的图象;
②设点
与点
所在函数的图象分别与直线
从左至右依次相交于
,
,
,
,是否存在
的情况?请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a23e87d16c32b5aa4357f481b5808a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eca756b3e58eca1654e1101a3cd30ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cee6765a83140d745a6de4c85d9b6b50.png)
(1)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cee6765a83140d745a6de4c85d9b6b50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(2)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
①猜想点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cee6765a83140d745a6de4c85d9b6b50.png)
②设点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cee6765a83140d745a6de4c85d9b6b50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff4d12362d4b8dd25813953e1c5a94b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97c01fdc7bc471af0b264a04aef0823e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43a71fc9c0068109dad1382354570665.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2857fac4963b129d99e79dcb3e13d295.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a821e643d5fae24caed0faa6d423dad6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/847c0a08f164f7f3c1c7fb00101cfea1.png)
![](https://img.xkw.com/dksih/QBM/2021/5/27/2730112669761536/2732084724056064/STEM/8b6803b7-143f-427e-a24c-0274a31b22d6.png?resizew=255)
您最近一年使用:0次
2021-05-30更新
|
269次组卷
|
2卷引用:2021年江西省初中名校联盟九年级综合测评卷数学试题
名校
2 . 在一空旷场地上设计一落地为矩形ABCD的小屋,AB+BC=10m,拴住小狗的10m长的绳子一端固定在B点处,小狗在不能进入小屋内的条件下活动,其可以活动的区域面积为S(m2).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/30/7ba9ee9f-bbd1-4ff7-b5b6-dce517c6cfa7.png?resizew=306)
(1)如图1,画出小狗活动的区域,并求出当BC=2m时S的值.(结果保留π)
(2)如图2,现考虑在(1)中的矩形ABCD小屋的右侧以CD为边拓展一正△CDE区域,使之变成落地为五边形ABCED的小屋,其他条件不变,设BC=x,
①写出面积S与x的关系式;
②在BC的变化过程中,当S取得最小值时,求边BC的长及S的最小值.(结果保留π)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/30/7ba9ee9f-bbd1-4ff7-b5b6-dce517c6cfa7.png?resizew=306)
(1)如图1,画出小狗活动的区域,并求出当BC=2m时S的值.(结果保留π)
(2)如图2,现考虑在(1)中的矩形ABCD小屋的右侧以CD为边拓展一正△CDE区域,使之变成落地为五边形ABCED的小屋,其他条件不变,设BC=x,
①写出面积S与x的关系式;
②在BC的变化过程中,当S取得最小值时,求边BC的长及S的最小值.(结果保留π)
您最近一年使用:0次
3 . 如图1是一架菱形风筝,它的骨架由如图2的4条竹棒
,
,
,
组成,其中
,
,
,
分别是菱形
四边的中点,现有一根长为
的竹棒,正好锯成风筝的四条骨架,设
,菱形
的面积为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/2/d763f4d3-f823-4936-91b2-dfd9f75c1f2f.png?resizew=547)
(1)写出
关于
的函数关系式及自变量
的取值范围;
(2)如图3,在所给的直角坐标系中画出(1)中的函数图象;
(3)为了使风筝在空中有较好的稳定性,骨架
长度必须大于骨架
长度且小于
长度的两倍,现已知菱形
的面积为
,则骨架
和
的长为多少?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42887d9bf31c1dd99f13c39e63c9ab9.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/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f748a2fff2648c65b80355004b13bbc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6959d41b68667c43ac1e20ff08432f36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d740004cfdade4c185f722dadc27e15.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/2/d763f4d3-f823-4936-91b2-dfd9f75c1f2f.png?resizew=547)
(1)写出
![](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)
(2)如图3,在所给的直角坐标系中画出(1)中的函数图象;
(3)为了使风筝在空中有较好的稳定性,骨架
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/081085e0342a8d080d60808cddb781e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
您最近一年使用:0次
4 . (1)如图①,点C是
中点,
,P是
上任意一点,则线段
与
的数量关系是________.
(2)如图②,在平面直角坐标系中,直线
分别交x轴、y轴于点A和点B,点C是
中点,
交
于点D,连接
,求
的长.
(3)如图③,①将线段
绕点A顺时针旋转
得到线段
,请在图③网格中画出线段
;
②若存在一点P,使得
,且
,当点P的横、纵坐标均为整数时,则
长度的最小值为______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b757f0c42ae5c9a2d6a4b19e5877b27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
(2)如图②,在平面直角坐标系中,直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5986392869d5f309ad37c3f0834d3866.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b757f0c42ae5c9a2d6a4b19e5877b27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
(3)如图③,①将线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a94dd82d1afae354ad795138fb5b6919.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a94dd82d1afae354ad795138fb5b6919.png)
②若存在一点P,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e47e6c60305be1f758c54e63139a5fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2b46dd1a5fb1ec92839d6a283628df5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://img.xkw.com/dksih/QBM/2021/4/22/2705060054966272/2715904554344448/STEM/436e4675-ba8d-41bd-96f0-e82ffefea22e.png)
您最近一年使用:0次
真题
名校
5 . 下图是某同学正在设计的一动画示意图,
轴上依次有
,
,
三个点,且
,在
上方有五个台阶
(各拐角均为
),每个台阶的高、宽分别是1和1.5,台阶
到
轴距离
.从点
处向右上方沿抛物线
:
发出一个带光的点
.
![](https://img.xkw.com/dksih/QBM/2021/6/22/2748574003732480/2748701406085120/STEM/439de0be-b74f-4f5e-8ec9-506111719bcf.png)
(1)求点
的横坐标,且在图中补画出
轴,并直接 指出点
会落在哪个台阶上;
(2)当点
落到台阶上后立即弹起,又形成了另一条与
形状相同的抛物线
,且最大高度为11,求
的解析式,并说明其对称轴是否与台阶
有交点;
(3)在
轴上从左到右有两点
,
,且
,从点
向上作
轴,且
.在
沿
轴左右平移时,必须保证(2)中沿抛物线
下落的点
能落在边
(包括端点)上,则点
横坐标的最大值比最小值大多少?
【注:(2)中不必写
的取值范围】
![](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/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01cd2bf7c88e24c91625e0f20ba2a4bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88e9f7d1272b7344346b58b660aa260a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbf693dc909eb48a6bfddfcb1c701545.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e9a724b59c890095baa5cb73e267c44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50753afb4f706f4a1308c4a87b717937.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c88d9142df6ba8e43c1a93bd04a1362.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d63494ec73f665ac77eb12656b20573.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://img.xkw.com/dksih/QBM/2021/6/22/2748574003732480/2748701406085120/STEM/439de0be-b74f-4f5e-8ec9-506111719bcf.png)
(1)求点
![](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/dad2a36927223bd70f426ba06aea4b45.png)
(2)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c88d9142df6ba8e43c1a93bd04a1362.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bb192110266d1aefe5a1de2adcc927e.png)
(3)在
![](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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82773737609e65dea3c5c67099f1b10d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e61fcbf0d7edec7218c853d5b2e523df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60634341a9603e24b2bbc6960abe3d31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c15514bc735fe4b744672edefe00009c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.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/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
【注:(2)中不必写
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
您最近一年使用:0次
2021-06-22更新
|
3511次组卷
|
9卷引用:河北省2021年中考数学试题
河北省2021年中考数学试题(已下线)专题16 函数与其他实际运用问题【考点精讲】-【中考高分导航】备战2022年中考数学考点总复习(全国通用)2022年福建省厦门市湖里中学九年级下学期适应性练习数学试题(已下线)专题03 函数-5年(2018-2022)中考1年模拟数学真题分项汇编(河北专用)江苏省苏州市苏州工业园区星汇学校2022-2023学年九年级下学期3月月考数学试题2022年江西省新余市第一中学中考数学模拟试卷 (已下线)22.3 实际问题与二次函数(习题)-2022-2023学年九年级数学上册同步精讲精练(人教版)(已下线)河北中考数学历年真题二次函数应用、综合题16-二次函数实际应用
20-21九年级上·江苏南通·期中
解题方法
6 . 定义:
叫做函数
的“反函数”.比如
就是
的“反函数”.数形结合是学习函数的一种重要方法,对于二次函数
(
的常数),若点
在函数
的图象上,则点
也在其图象上,即从数的角度可以知道它的图象关于
轴对称.
![](https://img.xkw.com/dksih/QBM/2020/11/22/2598331878506496/2599343674892288/STEM/9c8ba50ebd034f47995ddd8afc01045b.png?resizew=297)
根据上面的定义和提示,解答下列问题:
(1)
的图象的对称轴是_______;
(2)①直接写出函数
的“反函数”的表达式为_______;
②在如图所示的平面直角坐标系中画出
的“反函数”的大致图象;
(3)若直线
与
轴交于点
,与
轴交于点
,与
的“反函数”图象交于
、
两点(点
的横坐标小于点
的横坐标),过点
作
轴,垂足为点
,若
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f773e2ceaff0e2c54b432b649f2411f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cf210c8c9e83e70f2d3ede1e18a5f3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e8953ded144195804384dcb494d5e2a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/344ccbf79da6ad7e3709d6fa72efb756.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cf210c8c9e83e70f2d3ede1e18a5f3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20849c00c47cbdc43f18d53341b6c4e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba7204f43679af6935e494c59d40c6ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cf210c8c9e83e70f2d3ede1e18a5f3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf8faa56dbd665fd14ede66ff52c7605.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://img.xkw.com/dksih/QBM/2020/11/22/2598331878506496/2599343674892288/STEM/9c8ba50ebd034f47995ddd8afc01045b.png?resizew=297)
根据上面的定义和提示,解答下列问题:
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e8953ded144195804384dcb494d5e2a.png)
(2)①直接写出函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/108c18cb76d7d34b05c991a644c8b136.png)
②在如图所示的平面直角坐标系中画出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/108c18cb76d7d34b05c991a644c8b136.png)
(3)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf7ed77b70523f08a0bcecb350d9cce1.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/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/108c18cb76d7d34b05c991a644c8b136.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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d84acd3c96e20c0ce064aac125f7fe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98856c7df29ccd43e4edee164b62a8ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
您最近一年使用:0次
7 . 如图1是一架菱形风筝,它的骨架由如图2的4条竹棒AC,BD,EF,GH组成,其中E,F,G,H分别是菱形ABCD四边的中点,现有一根长为80cm的竹棒,正好锯成风筝的四条件架,是BD=xcm,菱形ABCD的面积为ycm2.
(1)写出y关于x的函数关系式及自变量x的取值范围;
(2)如图3,在所给的直角坐标系中画出(1)中的函数图象;
(3)为了使风筝在空中有较好的稳定性,骨架AC长度必须大于骨架BD长度且小于BD长度的两倍,现已知菱形ABCD的面积为375cm2,则骨架BD和AC的长为多少?
(1)写出y关于x的函数关系式及自变量x的取值范围;
(2)如图3,在所给的直角坐标系中画出(1)中的函数图象;
(3)为了使风筝在空中有较好的稳定性,骨架AC长度必须大于骨架BD长度且小于BD长度的两倍,现已知菱形ABCD的面积为375cm2,则骨架BD和AC的长为多少?
![](https://img.xkw.com/dksih/QBM/2021/4/21/2704351500181504/2707464906260480/STEM/aca2088d-a67f-4a80-9192-8005d41f1f7f.png)
您最近一年使用:0次
8 . 现有规定:若抛物线的顶点在坐标轴上,则称该抛物线为“数轴函数”.例如抛物线
和
都是“数轴函数”.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/13/d73d02d5-d7af-4fbb-9f14-e6a42b08bc6a.png?resizew=348)
(1)在同一直角坐标系中直接 画出抛物线
和![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d72c36149bd2a42b7e05714cb3803e4c.png)
;
(2)
和
是“数轴函数”吗?请说明理由;
(3)若
是“数轴函数”,求
的值和它的表达式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c28b4f0234b698f001e7dec787b4d44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d72c36149bd2a42b7e05714cb3803e4c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/13/d73d02d5-d7af-4fbb-9f14-e6a42b08bc6a.png?resizew=348)
(1)在同一直角坐标系中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c28b4f0234b698f001e7dec787b4d44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d72c36149bd2a42b7e05714cb3803e4c.png)
![](https://img.xkw.com/dksih/QBM/2020/9/25/2557368675164160/2557573934800896/STEM/5121a53880174203a166a2b0f3f2b38d.png?resizew=27)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ae190e65378b216a74c31374f9f0876.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3aff32c80bc21cfeb8b523e893abaf3c.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/444b4fafa85482fa27fb26329b138e13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
您最近一年使用:0次
9 . 已知二次函数y=ax2+(3a+1)x+3(a<0).
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/4/0ac724f5-f6fb-4fe1-8658-bfeb7d016865.png?resizew=205)
(1)该函数的图象与y轴交点坐标为 ;
(2)当二次函数的图象与x轴的两个交点的横坐标均为整数,且a为负整数.
①求a的值及二次函数的表达式;
②画出二次函数的大致图象(不列表,只用其与x轴的两个交点A、B,且A在B的左侧,与y轴的交点C及其顶点D,并标出A,B,C,D的位置);
(3)在(2)的条件下,二次函数的图象上是否存在一点P,使△PCA为直角三角形,如果存在,求出点P的坐标;如果不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/4/0ac724f5-f6fb-4fe1-8658-bfeb7d016865.png?resizew=205)
(1)该函数的图象与y轴交点坐标为 ;
(2)当二次函数的图象与x轴的两个交点的横坐标均为整数,且a为负整数.
①求a的值及二次函数的表达式;
②画出二次函数的大致图象(不列表,只用其与x轴的两个交点A、B,且A在B的左侧,与y轴的交点C及其顶点D,并标出A,B,C,D的位置);
(3)在(2)的条件下,二次函数的图象上是否存在一点P,使△PCA为直角三角形,如果存在,求出点P的坐标;如果不存在,请说明理由.
您最近一年使用:0次
2020-08-13更新
|
285次组卷
|
2卷引用:2020年江苏省徐州市铜山区、睢宁县、邳州市等六区县(市)九年级第二次质量检测数学试题
名校
10 . 有这样一个问题:探究函数
的图象和性质.
小奥根据学习函数的经验,对函数
的图象和性质进行了探究.下面是小奥的探究过程,请补充完整:
(1)函数
的自变量x的取值范围是_______;
(2)下表是y与x的几组对应值:
则表格中的为m为_______;
(3)如下图,在平面直角坐标系
中,描出了以上表中各对对应值为坐标的点.根据描出的点,画出该函数的图象;
(4)进一步探究发现,该函数图象在第一象限内的最低点的坐标是
.结合函数图象,写出该函数的其他性质(一条即可):__________;
(5)若直线
(n为常数)与该函数图像无交点,则n的取值范围为_______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c3c181141276f81b327ceea3c1ac3ee.png)
小奥根据学习函数的经验,对函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c3c181141276f81b327ceea3c1ac3ee.png)
(1)函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c3c181141276f81b327ceea3c1ac3ee.png)
(2)下表是y与x的几组对应值:
x | … | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | 1 | 2 | 3 | 4 | 5 | … |
y | … | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | 2 | m | ![]() | ![]() | … |
(3)如下图,在平面直角坐标系
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7795aec93c2c7ac2fd93e6747ca6516c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/25/3ac466cf-52a4-4e70-bb97-5076ce4a7381.jpg?resizew=252)
(4)进一步探究发现,该函数图象在第一象限内的最低点的坐标是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b86022205a7487439dd8d0897cd3bf19.png)
(5)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8963da33f2dd163bee1e890958f858b.png)
您最近一年使用:0次
2020-10-21更新
|
203次组卷
|
3卷引用:河南省洛阳市2019-2020学年九年级下学期东方二中6月份数学测试卷