飞行中的炮弹经
秒后的高度为
米,且高度与时间的关系为
,若此炮弹在第
秒与第
秒时的高度相等,则炮弹在最高处的时间是第________ 秒.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20cc6de24c9f456f41c15f609fe2c2c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b06e95b57b7a81cd81d05557a11fa92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/180ea775f2af05650404d764384e7faa.png)
更新时间:2016-12-06 09:43:04
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【知识点】 投球问题(实际问题与二次函数)解读
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