如图,在
中,
,
,点
是线段
上一点(不与点
、
重合),连接
,过点
、
分别作
、
的垂线,两线相交于点
,则
面积的最大值为____ .
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22-23九年级上·重庆开州·期末 查看更多[2]
重庆市开州区2022-2023学年九年级上学期期末数学试题(已下线)专题22.32 实际问题与二次函数(分层练习)(培优练)-2023-2024学年九年级数学上册基础知识专项突破讲与练(人教版)
更新时间:2023-07-24 21:24:15
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【推荐1】如图,在
中,
,
,
,
为
边上一动点(不与点
重合),以
为边长作正方形
,连接
,则
的面积的最大值等于________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3c65edad25ddd666cdce0d7e5afefc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc34db5860990e51ba31edc8cdd077c2.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b32c05247f6998d7a70d31d13be4148c.png)
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【推荐2】如图,在正方形
中,
是对角线
与
的交点,
是
边上的动点(点
不与点
,
重合),过点
作
交
于点
,连结
、
,
.下列五个结论:①
;②
;③
;④若
,则
的最小值是
;⑤
.其中正确结论是___________ ;(只填序号)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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【推荐1】如图,边长为1的正方形
的对角线
、
相交于点
,有直角
,使直角顶点P与点O重合,直角边
、
分别与
、
重合,然后逆时针旋转
,旋转角为
,
、
分别交
、
于E、F两点,连接
交
于点G,则下列结论:(1)
;(2)
;(3)
;(4)在旋转过程中,当
与
的面积之和最大时,
;(5)
,其中正确的是_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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【推荐2】如图,在第一象限内作与x轴的夹角为30°的射线OC,在射线OC上取点A,过点A作AH⊥x轴于点H,在抛物线y=x2(x>0)上取一点P,在y轴上取一点Q,使得以P,O,Q为顶点的三角形与△AOH全等,则符合条件的点A有____ 个.
![](https://img.xkw.com/dksih/QBM/2021/4/8/2695386663477248/2697720022466560/STEM/f2d8751f-5766-49ac-8be2-48a4f9e29f2d.png)
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