若一元二次方程
的两个根分别是矩形的边长,则矩形对角线长为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dac77366c746161a381e0589d63e451.png)
更新时间:2020-06-11 07:14:28
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【推荐1】已知等腰直角三角形斜边上的高为方程
的根,那么这个直角三角形斜边的长是 _____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bfcffd48bd96e513072d998b69b6629.png)
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【推荐2】如图,A,B分别为x轴,和y轴正半轴上的点.
、
的长分别是
的两根(
),直线
平分
交x轴于C点,P为
上一动点,P点以每秒1个单位的速度从B点开始沿
方向向终点C移动.
(1)设
和
的面积为
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23fb917816706e46935cf225893e3ab3.png)
______ .
(2)P点移动时间为t,当![](https://staticzujuan.xkw.com/quesimg/Upload/formula/825116eb345f5505ebc8c1cdb8a1f131.png)
______ 时,
是等腰三角形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66c7a677b9230fe19d301828469ef1f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/18/c6272199-3e39-4d9a-88f1-0453faff5384.png?resizew=173)
(1)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af2cc5f8cec8c498aa12c99c04e1c97d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a10347f66197ccc693068ca3686e793.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23fb917816706e46935cf225893e3ab3.png)
(2)P点移动时间为t,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/825116eb345f5505ebc8c1cdb8a1f131.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9dc427a01582ec222446b352d40ab0d.png)
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【推荐1】如图是一种手机三脚架,它通过改变锁扣C在主轴
上的位置调节三脚架的高度,其它支架长度固定不变.已知支脚
,底座
,且
,F是
上的固定点,且
.当点B,G,E三点在同一直线上(如图1所示)时,测得
;若将点C向下移动
,则点B,G,F三点在同一直线上(如图2),此时点A离地面的高度是_____
.
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【推荐2】如图①,在正方形
中,点
是
的中点,点
是对角线
上一动点,设
,
,图②是
关于
的函数图象,且图象上最低点
的坐标为
,则正方形
的边长为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
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【推荐1】如图,在矩形
中,
,
,P为矩形内一点,
,连接
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/19/48861453-5b40-46ba-a02f-ee475d833888.png?resizew=128)
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名校
【推荐2】如图,矩形
中,对角线
交于
点.若
,
,则
的长为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/989c75a3fd02e4971cab421c88de92f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
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