如图,抛物线
交
轴于点
和
,交
轴于点
,抛物线的顶点为
.下列四个命题:①当
时,
;②若
,则
;③抛物线上有两点
和
,若
,且
,则
;④点
关于抛物线对称轴的对称点为
,点
、
分别在
轴和
轴上,当
时,四边形
周长的最小值为
.其中真命题的序号是______ .
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2017·天津红桥·模拟预测 查看更多[6]
2017年天津市红桥区西沽中学九年级数学中考模拟试题2021学年广东省广州市铁一中学九年级下学期第二次模拟测试数学试题(已下线)专题22.27 二次函数“将军饮马”问题(巩固篇)(专项练习)-2022-2023学年九年级数学上册基础知识专项讲练(人教版)(已下线)专题2.30 二次函数“将军饮马”问题(巩固篇)(专项练习)-2022-2023学年九年级数学下册基础知识专项讲练(北师大版)(已下线)专题5.30 二次函数“将军饮马”问题(巩固篇)(专项练习)-2022-2023学年九年级数学下册基础知识专项讲练(苏科版)福建省厦门大学附属科技中学2023-2024学年九年级上学期期中数学试题
更新时间:2021-09-02 11:27:27
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