1 . 已知二次函数
图象上部分点的横坐标x,纵坐标y的对应值如下表所示:
(1)求二次函数的解析式及顶点坐标;
(2)直接写出当
时,x的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe6337d68cd5653767e3a1889b8b2e3.png)
x | … | 0 | 1 | 2 | 4 | … | |
y | … | 8 | 3 | 0 | 3 | … |
(2)直接写出当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/061813f1ec633c5c4c393c4de7938322.png)
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2 . 在平面直角坐标系
中,点
,
为抛物线
上两个不同的点.
(1)求抛物线的对称轴(用含m的式子表示);
(2)若
,求m的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4e069d41d57a8e4097701319fed1324.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3aa3003b5af22c4e0a89f7fb42694fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69ef85837bf59cb286844948611e6441.png)
(1)求抛物线的对称轴(用含m的式子表示);
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/434f56cdb93bd5d540e23db2d821bb6b.png)
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2024-01-19更新
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2卷引用:北京市丰台区2023-2024学年九年级上学期期末数学试题
3 . 在平面直角坐标系
中,抛物线
与
轴的一个交点为
.
(1)
________;
(2)画出函数
的图像;
(3)当
时,结合函数图像直接写出
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29f09b500a60ed3a5d28eca9546b5de2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0929421a6188c3122442866b0b85a5e.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4e9bb42376c12d7d21702ae8062b25a.png)
(2)画出函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29f09b500a60ed3a5d28eca9546b5de2.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/208e321e1a4a443e103db2482359feae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
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4 . 二次函数
的图象是一条抛物线,自变量x与函数y的部分对应值如下表:
有如下结论:
①抛物线的开口向上
②抛物线的对称轴是直线![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b650820d7bed48ed67a2869ad8c65ff1.png)
③抛物线与y轴的交点坐标为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fec40ff4479edca2ed18b6cadb8db72f.png)
④由抛物线可知
的解集是![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2b13d3854ea2671a9ae5be5b69a573e.png)
其中正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8352b2e643a7ce605334f1b0e572bfb0.png)
x | … | 0 | 1 | 2 | 3 | … | ||
y | … | 0 | 0 | … |
①抛物线的开口向上
②抛物线的对称轴是直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b650820d7bed48ed67a2869ad8c65ff1.png)
③抛物线与y轴的交点坐标为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fec40ff4479edca2ed18b6cadb8db72f.png)
④由抛物线可知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f84617aaab200384efeaec9a4fe71772.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2b13d3854ea2671a9ae5be5b69a573e.png)
其中正确的是( )
A.①② | B.①②③ | C.①②④ | D.①②③④ |
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5 . 在平面直角坐标系
中,点
,
在抛物线
上.
(1)当
时,求抛物线的对称轴;
(2)若抛物线
经过点
,当自变量x的值满足
时,y随x的增大而增大,求a的取值范围;
(3)当
时,点
,
在抛物线
上.若
,请直接写出m的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb0e705301752424a492f6277ed7774e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd0cc0c8a3de6e1aa4e5f19795e91ee5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8352b2e643a7ce605334f1b0e572bfb0.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eb26fe536ed9d50b71d7c49b6826dd4.png)
(2)若抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8352b2e643a7ce605334f1b0e572bfb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b334e2eaa7e8fb79cef8208b56ee4f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55a12a30935c79ae769818043a496f53.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/843e797da1f95cfd3b65ee2ebe90909e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96718982919e778ae41f03392d6704be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/316df94bd87c3bda8ba56ff85e69f222.png)
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2024-01-11更新
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600次组卷
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5卷引用:北京市昌平区2023-2024学年九年级上学期期末数学试题
北京市昌平区2023-2024学年九年级上学期期末数学试题(已下线)数学(北京卷)-学易金卷:2024年中考第一次模拟考试北京市海淀外国语实验学校2023~2024学年九年级下学期月考数学试题2024年北京外国语大学附属外国语学校中考零模数学试题(已下线)专题04 二次函数 (1大易错点分析+20个易错点+易错题通关)-备战2024年中考数学考试易错题(江苏专用)
6 . 已知二次函数
的图象过点
和
.
(1)求这个二次函数的解析式;
(2)当
时,结合图象,直接写出函数值y的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58d88bbd34102b55fa928e8ff83f0d52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8748dc55e2f45bc37fc4d84d7310f79.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba807aba93509588a99824cf24e2e64f.png)
(1)求这个二次函数的解析式;
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2da45e190edb2230c9b6495647954d1c.png)
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7 . 已知抛物线
的对称轴为直线
.
(1)若点
在抛物线上,求
的值
(2)若点
在抛物线上;
①当
时,求
的取值范围;
②若
,且
,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d8de071a9c22c96a59b172d76c127e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6f7b16d65f1b2b8bea8cf4a83fde925.png)
(1)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5b39f102a547d063e5a1a92666a555c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4b53ff5613d0e397e046f004543d7b7.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a2a51944c720568f35d443589dfc1aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fdeb656a669f2901c0a389d50418456.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52b3f2b616686bff495501cfc8a0220e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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8 . 如图,二次函数
的图象与
轴交于
、
两点,与
轴交于点
,且点
的坐标为
,点
的坐标为
,一次函数
的图象过点
、
.
(1)求二次函数的解析式;
(2)直接写出二次函数的图象与x轴的另一个交点B的坐标;
(3)根据图象,直接写出
时,x的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af840c6111ed53db713cd8645cf53820.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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/079dd115a4b8cbc93918a853363786dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bd685943cf39f7945b31e42d6221788.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebe47e01d46d427917ef49b8b4547790.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/29/5873dac5-729e-4d92-9f98-a003e7943faf.png?resizew=216)
(1)求二次函数的解析式;
(2)直接写出二次函数的图象与x轴的另一个交点B的坐标;
(3)根据图象,直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c14afef31dafd22343bcc789cafa5c4b.png)
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9 . 在平面直角坐标系
中,抛物线
,若
,
为抛物线上两个不同的点,设抛物线的对称轴为
.
(1)当
时,求
的值;
(2)若对于
,都有
,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47efcc385d45242ad4411464bde16084.png)
![](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/a6f7b16d65f1b2b8bea8cf4a83fde925.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a2a51944c720568f35d443589dfc1aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)若对于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64c6f8aeb7e1cbb2d9876f5b6bca54b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ac67e9a909472ab852d38d2ec66a1e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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10 . 已知二次函数
.
(1)将
化成
的形式,并写出顶点坐标;
(2)在所给的平面直角坐标系
中,画出它的示意图;
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/15/afd59cff-5f6e-4d79-94ab-6a0cc716c09a.png?resizew=246)
(3)当
时,直接写出
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/620fff76456e4080c41c51661171c66f.png)
(1)将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/620fff76456e4080c41c51661171c66f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6ddc0a29bfef85c1441d02ff117a183.png)
(2)在所给的平面直角坐标系
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/15/afd59cff-5f6e-4d79-94ab-6a0cc716c09a.png?resizew=246)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2da45e190edb2230c9b6495647954d1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
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