1 I don`t know if they ___ A party next sunday A will have B would have C had D can have 为什么是B 2 2009•兰州)如图,某公路隧道横截面为抛物线,其最大高度为6米,底部宽度OM为12米.现以O点为原点,OM所在直

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1 I don`t know if they ___ A party next sunday A will have B would have C had D can have 为什么是B 2 2009•兰州)如图,某公路隧道横截面为抛物线,其最大高度为6米,底部宽度OM为12米.现以O点为原点,OM所在直
1 I don`t know if they ___ A party next sunday A will have B would have C had D can have 为什么是B 2 2009•兰州)如图,某公路隧道横截面为抛物线,其最大高度为6米,底部宽度OM为12米.现以O点为原点,OM所在直线为x轴建立直角坐标系.
(1)直接写出点M及抛物线顶点P的坐标;
(2)求这条抛物线的解析式;
(3)若要搭建一个矩形“支撑架”AD-DC-CB,使C、D点在抛物线上,A、B点在地面OM上,则这个“支撑架”总长的最大值是多少?为什么oa =bm!谢谢了30分 虽然不多

1 I don`t know if they ___ A party next sunday A will have B would have C had D can have 为什么是B 2 2009•兰州)如图,某公路隧道横截面为抛物线,其最大高度为6米,底部宽度OM为12米.现以O点为原点,OM所在直
1、if后面接的将来时的虚拟语气啦,自己去看看笔记吧
2、(1)M(12,0);P(6,6)
(2)设抛物线方程为y=a(x-x0)^2+b然后将M点和P点的坐标带进去就能求出来了,答案省略
(3)oa=bm这是显然的啦,因为是对称的啦,而且求的是最大值啦.
【亲,还是好好学习吧!既然是简单的题目,那我相信你也是可以做出来的.】