如图,抛物线
交x轴分别于点
,
,交y轴正半轴于点D,抛物线顶点为C.下列结论:①
;②
;③
;④当
是等腰直角三角形时,
;⑤若
,则抛物线的对称轴直线
上的动点P与B、D两点围成的
周长最小值为
.其中,正确结论的序号为________ .
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a18a7caa080988802ba1145b4fe4203.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/14/bc4f66bd-e88c-45cb-b1ee-48155d23c598.png?resizew=171)
更新时间:2022-12-11 20:35:19
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