已知抛物线
且经过点
、
.
(1)求抛物线的解析式:
(2)直接写出不等式
的解集.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88856df184f4e8aef9e110fd99d1f6f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66b8c639c851e0044ee22020324c5570.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35b82f1aa0c76e5939090f45581bca7f.png)
(1)求抛物线的解析式:
(2)直接写出不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5907fd78d227204d0207b1df44a4801.png)
更新时间:2023-08-03 22:45:44
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【推荐1】公路上正在行驶的甲车,发现前方
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(1)当甲车减速至
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【推荐2】在平面直角坐标系xOy中,关于x的二次函数y=
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(1)当抛物线的图象经过点(1,-4)时,求该抛物线的表达式;
(2)求这个二次函数的对称轴(用含a的式子表示);
(3)若抛物线上存在两点A(
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-
=0,
+
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<0,
>0时,总有
+
>0,求a的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b0a89e3c30f6e4d4c5db4378b05d987.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/29/8c4d52a4-653a-45c0-989d-cdf97bc5e98a.png?resizew=380)
(1)当抛物线的图象经过点(1,-4)时,求该抛物线的表达式;
(2)求这个二次函数的对称轴(用含a的式子表示);
(3)若抛物线上存在两点A(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54015ff5b49e3283901da1291b6b921d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec19b68e3add9d5bfcc6269a1855b87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46f6872ffb1934339c53c2c2282d5889.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46f6872ffb1934339c53c2c2282d5889.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
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【推荐1】在平面直角坐标系
作函数
与函数
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(1)列表:表中a=___________,b=___________,c=___________;
(2)描点、连线: 在图所示的坐标系中作出函数
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![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/25/e25db602-575f-4b4d-9db9-338949b1efb3.png?resizew=213)
①函数
图象的顶点坐标为___________;
②直接写出不等式
0的解集为___________;
③直接写出不等式
的解集为___________.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7795aec93c2c7ac2fd93e6747ca6516c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17d794141572c8b1e70957754f32b9eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ab466aedd6e176088d8dee7bc3e3aaa.png)
x | ... | 0 | 1 | 2 | 3 | 4 | 5 | ... | ||
... | a | 0 | 0 | a | c | ... | ||||
... | 0 | 1 | 2 | 3 | 4 | 5 | b | ... |
(2)描点、连线: 在图所示的坐标系中作出函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f92738aadeac1e3d3d8e919772bce727.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ab466aedd6e176088d8dee7bc3e3aaa.png)
(3)观察图,回答下列问题:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/25/e25db602-575f-4b4d-9db9-338949b1efb3.png?resizew=213)
①函数
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②直接写出不等式
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③直接写出不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1cad49f5e75e4edb0cf4d91690e264d.png)
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(1)写出不等式
的解集____________;
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5f28031b036e4a37be931d5ff28368.png)
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(4)当
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