抛物线
关于
轴对称后所得到的抛物线解析式为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/195fe58c4c17037ea0ad69e2c436c296.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
2020·湖北孝感·模拟预测 查看更多[3]
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更新时间:2020-10-17 06:49:25
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【推荐1】二次函数的
与
的部分对应值如表,则下列判断中正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![]() | … | 0 | 1 | 3 | 4 | … |
![]() | … | 2 | 4 | 2 | -2 | … |
A.抛物线开口向上 | B.![]() |
C.当![]() ![]() ![]() | D.当![]() ![]() |
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【推荐2】如图,已知二次函数
在坐标平面上的图象经过
、
两点.若
,
,则
的值可能为( )
![](https://img.xkw.com/dksih/QBM/2018/11/4/2068374433161216/2069925929099264/STEM/68b65219c7f3441eb901da9f159cd51d.png?resizew=105)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c34a0f111bb1149c73399ff08c189b81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4180c7f7bc8ccd47ccc466d8c6544656.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3394a20038e150df5d199d35f3f567ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cf2f46bc120e5b6f8317b02370bffbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b076814acc8df3b1cc9d2b24e265888e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eabd5f3a86afe49dcd70571e2b96cfd.png)
![](https://img.xkw.com/dksih/QBM/2018/11/4/2068374433161216/2069925929099264/STEM/68b65219c7f3441eb901da9f159cd51d.png?resizew=105)
A.1 | B.3 | C.5 | D.7 |
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【推荐1】已知抛物线
与y轴的交点在x轴的下方,下列说法中正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ef709eaee7560470480ff2f72461c38.png)
A.该抛物线的顶点一定在第一象限 | B.该抛物线的顶点一定在第二象限 |
C.该抛物线的顶点一定在第三象限 | D.该抛物线的顶点所在象限不确定 |
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【推荐2】二次函数
的图象如图所示,以下结论:①
②
③
④顶点坐标为
⑤当
时,y随x的增大而减小⑥
正确的有几个( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73c21bd0bd90a89b7ff5ac0eacf612a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94cbc6fbdb7a42c4f3f63ce6424e2eab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f258e2481aa0a861dde26dfbcf685cc4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00ebf12be9314c6bfb2bbf13b7bfcceb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0387735759084e9c6e2bc3ad93875e32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12e7ef804eeb23618fbf91ead47587f2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/23/97c52807-e60e-4b78-a426-9b11b7c83a3e.png?resizew=158)
A.3个 | B.4个 | C.5个 | D.6个 |
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【推荐1】若二次函数
的图象的顶点在第一象限,且过点
和
,则
的值的变化范围是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d06d31c9a2298b02664a86ddd91b1121.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5d1b0e316f658f4ffe056511101614d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcc2c355e5107068d61eee7d23fdd855.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】抛物线
(a,b,c为常数,
)对称轴是直线
,抛物线与x轴相交于
,
两点,
,下列结论正确的是( ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef00713e73b8357cc7900144f5505bc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9df2062940530232ab124a571e951ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fb652143b43cc9439a347b2b1dc5cf6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b96e97805f0853d6f994f0fad3b5aa05.png)
A.![]() |
B.![]() ![]() ![]() |
C.![]() |
D.方程![]() ![]() ![]() ![]() |
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