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1 . 已知点A,B的坐标分别为
和
,抛物线
的顶点在线段AB上运动时,形状保持不变,且与x轴交于C,D两点(C在D的左侧).给出下列结论:①
;②当
时,y随x的增大而增大;③若点D的横坐标最大值为5,则点C的横坐标的最小值为
;④当四边形
为平行四边形时,
.其中正确结论的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/148d97803c3b16893ced41ad5cd9aba4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2ce2f5e22175e3ff8ab5e0afca58f9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/990a64c41f96ef4355bf4ae017143f99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45641ee74814ba843b140e1833c7f353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75e1512c67e2f7696e7558b43b954641.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d13ce3ebd1112220c639562739f1f9d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea51de5ca1c2879e7a767a60ce4624cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b9f0255df77526718a46c4e78b78513.png)
A.②③ | B.②④ | C.①③④ | D.①②④ |
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