如图,四边形
中的两条对角线
,
互相垂直,
,当
长为______ 时,四边形
的面积最大.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7712aaf7c0fa135847df6e3a1d547b27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/6/889efe5d-6081-4e5a-9e46-d2002738fbc1.png?resizew=139)
更新时间:2024-01-02 16:42:19
|
【知识点】 图形问题(实际问题与二次函数)
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【推荐1】如图,在Rt△ABC中,∠B=90°,AB=6cm,BC=8cm,点P从A点开始沿AB边向点B以1cm/s的速度移动,点Q从B点开始沿BC边向点C以2cm/s的速度移动,则P、Q分别从A、B同时出发,经过 ___ 秒钟,使△PBQ的面积最大.
![](https://img.xkw.com/dksih/QBM/2021/12/5/2865757021290496/2867346734080000/STEM/d194a715-55ab-41cc-a4cc-7ae91e7129a1.png?resizew=150)
您最近一年使用:0次
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【推荐2】如图,用一段长为10米的篱笆围成一个一边靠墙(墙的长度不限)的长方形菜园
,设
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/27/3bcf3e96-56e8-4fbd-a351-b5a51e4be48f.png?resizew=180)
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