二次函数y=ax2+bx+c的图象的一部分如图所示,则a+b+c的取值范围是 .
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/7/2e0a9dd1-5898-42db-8dd5-6aabde4ed7b4.png?resizew=106)
更新时间:2016-12-05 22:55:14
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【知识点】 根据二次函数的图象判断式子符号解读
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【推荐1】函数
(a、b、c为常数,
)与
的图象如图所示,给出下面4个结论:
;
②
;
③
;
④当
时,
.
上述结论中、所有正确结论的序号是______ .
![](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/1f1524b3f629e0176586efb4ea437d3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9deb79d044a379f31a8fc57736d7ead.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63381c4b8fb5ecfd04af2808a99dca46.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed5b998c9460ba85a821126ff2b72d0b.png)
④当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec0345ad2eb83035986f0ad4d3abaa44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f67c1b4aeb4e07184ad474f7e81841ad.png)
上述结论中、所有正确结论的序号是
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【推荐2】如图,二次函数
图象的顶点为D,其图象与x轴的交点A,B的横坐标分别为
,3,与y轴负半轴交于点C.下面三个结论:①
;②
;③
;其中正确的结论是_________ .(请写出所有正确的序号)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8352b2e643a7ce605334f1b0e572bfb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acbc6a613224461ade69362d46550474.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa285de4d015f208441ffe9a84bbd780.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12e7ef804eeb23618fbf91ead47587f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80a117003593564662956ecbeac4f3d2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/20/87ddfb03-4c10-4370-9915-b3beaf6f680f.png?resizew=140)
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