两块全等的等腰直角三角板如图放置,∠BAC=∠EDF=90°,△DEF的顶点E与△ABC的斜边BC的中点重合,将△DEF绕点E旋转,旋转过程中,当点D落在直线AB上时,若BC=2,则AD=______ .
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/12/ef5d7167-4463-462a-8ab0-45645ed2a020.png?resizew=254)
更新时间:2022-05-07 19:16:38
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【推荐1】如图,在平面直角坐标系中,已知正方形ABCO,A(0,3),点D为x轴上一动点,以AD为边在AD的右侧作等腰Rt△ADE,∠ADE=90°,连接OE,则OE的最小值为________ .
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【推荐2】如图,直线
与x轴和y轴分别交与A,B两点,射线
于点A,若点C是射线
上的一个动点,点D是x轴上的一个动点,且以A,C,D为顶点的三角形与
全等,则
的长为______ .
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d390782b8ea7016628ee68403dcbfbf3.png)
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解题方法
【推荐1】在矩形ABCD中,P在边BC上,联结AP,DP,将△ABP,△DCP分别沿直线AP,DP翻折,得到
,
,且点
,
,P在同一直线上,线段
交边AD于点M,联结
,若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0de8fae873831b2ce2ae919e099d55d7.png)
_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b13e4828c0b33a84f8b97828a6bde9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7df018c41604a20a685020e3128f64c.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c407eeb34204a1df967b8fbe481cb04d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24bb49fdc6b6bbb2449fdf8a0de769d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab4ab0a48674c356bbdb5a62c4cea82b.png)
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【推荐2】如图,在正方形ABCD中,对角线AC,BD交于点O,点E,F分别在OB,OC上,且
,连接AE,BF,EF,则下列结论:①
;②
;③
;④
.其中正确的是______ .(填序号)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcf2e3236ea30ee2c37928b98041f13a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee73452ee4d5437f1399f1235b95e55f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4e22ba3e6e1c1d6b12d9b8baa8d1f02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b3d93c54252423bd0d6b312e7b393bd.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/24/a7fea5a7-bf80-4a75-a0e3-eb32e993f939.png?resizew=144)
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【推荐1】定义:在平面直角坐标系
中,已知点
,
,
,这三个点中任意两点间的距离的最小值称为点
,
,
的“最佳间距”.例如:点
,
,
的“最佳间距”是1.
(1)点
,
,
的“最佳间距”是__________ ;
(2)当点
,
,
的“最佳间距”为
时,点
的横坐标为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ff7768c2b3c99e26a9651d38755c99d.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b9cb8e6ff801523b0304576cd69fd2d.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52f64ce0cb15573f0e700e4891333b1a.png)
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(1)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f4d959c570141afd7d0d6abc3969012.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/919025c2d8eaf2705b44a7974d61eac2.png)
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(2)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19b62194097ac66a5093c57fca2f5b4f.png)
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【推荐2】我们将满足等式
的每组x,y的值在平面直角坐标系中画出,便会得到如图所示的“心形”图形.下面三个结论中,
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/24/07cb74c9-b2da-4a1b-b9b7-8dd4080df9e3.png?resizew=136)
①“心形”图形是轴对称图形;
②“心形”图形所围成的面积一定大于2;
③“心形”图形上任意一点到原点的距离都小于
,
所有正确结论的序号是___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a76e73fc44b8fcc3ffb9bc269ae7bcb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/24/07cb74c9-b2da-4a1b-b9b7-8dd4080df9e3.png?resizew=136)
①“心形”图形是轴对称图形;
②“心形”图形所围成的面积一定大于2;
③“心形”图形上任意一点到原点的距离都小于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
所有正确结论的序号是
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【推荐1】为了庆祝“六一儿童节”,育才初一年级同学在班会课进行了趣味活动,小舟同学在模板上画出一个菱形
,将它以点
为中心按顺时针方向分别旋转90°,180°,270°后得到如图所示的图形,其中
,
,然后小舟将此图形制作成一个靶子,那么当我们投飞镖时命中阴影部分的概率为______ .
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【推荐2】如图,一段抛物线;
,记为
它与
轴交于点
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绕点
旋转
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得
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轴于点
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__________ .
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