如图,在直角坐标系中,
,
,
,
,当四边形
周长最小时,
的值是( ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4b2a0a5dfb270e0a498d2922a68c514.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a1870b126b56972575980dafec654db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4551830dbd33c059607ff1dbc1d17041.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a256e96db7340dec5c188fc9d5e68592.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0be44077d42cfffece905b1af13e000.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/6/d680fe42-dc39-40be-b9c6-344b2babba13.png?resizew=140)
A.![]() | B.![]() | C..![]() | D.非以上答案 |
2024八年级·全国·竞赛 查看更多[2]
更新时间:2024-02-05 18:53:59
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【推荐1】如图,点
是反比例函数
在第一象限内的图象上一点,过
作
轴的垂线,垂足为点
,现将
绕点
顺时针旋转
得到
.线段
与反比例函数在同一象限交于点
,若
,则点
的横坐标( )
![](https://img.xkw.com/dksih/QBM/2020/9/29/2560006968254464/2563658685243392/STEM/b0665022-b91e-4770-83bd-330faa61da18.png?resizew=195)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
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【推荐2】如图,一束光线从点
出发,经y轴上的点C反射后经过点
,则点C的坐标是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c17ff5e0a917684d41cd41e0ae303308.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f55d12701014cf53071093e8739d089b.png)
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真题
【推荐1】新定义:在平面直角坐标系中,对于点
和点
,若满足
时,
;
时,
,则称点
是点
的限变点.例如:点
的限变点是
,点
的限变点是
.若点
在二次函数
的图象上,则当
时,其限变点
的纵坐标
的取值范围是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82aaa597a5aa6176863eda3fdf83e181.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a6ad9b0730708406d9b657ba683d593.png)
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【推荐2】如图,等边
的顶点
,
;规定把
“先沿
轴翻折,再向左平移1个单位”为一次变换,这样连续经过2021次变换后,等边
的顶点
的坐标为( ).
![](https://img.xkw.com/dksih/QBM/2021/5/2/2712453753503744/2721681262338048/STEM/671e69e8-e64b-40b7-87c4-3a127cc52614.png)
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【推荐1】如图,在
中,
,
,
,AD平分
交BC于D点,E,F分别是AD,AC上的动点,则
的最小值为
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【推荐2】如图,已知菱形
的面积为20,边长为5,点P、Q分别是边
上的动点,且
.连接
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