如图(1),在矩形ABCD中,已知BC=9,AB=15,E为AD上一点,若△ABE沿直线BE翻折,使点A落在DC边上点F处,折痕为BE.
(1)求证:△BCF∽△FDE;
(2)如图(2),矩形ABCD的一边BC在直角坐标系中x轴上,CD⊥x轴,设点C坐标为(m,0)(m<0),点P为平面内一点,若以O、B、F、P四点为顶点的四边形为菱形,请直接写出此时点C的坐标;
(3)如图(3),设抛物线y=a(x﹣m+5)2+h经过A、F两点,其顶点为M,连接AM,若∠OAM=90°,求a、h、m的值.
(1)求证:△BCF∽△FDE;
(2)如图(2),矩形ABCD的一边BC在直角坐标系中x轴上,CD⊥x轴,设点C坐标为(m,0)(m<0),点P为平面内一点,若以O、B、F、P四点为顶点的四边形为菱形,请直接写出此时点C的坐标;
(3)如图(3),设抛物线y=a(x﹣m+5)2+h经过A、F两点,其顶点为M,连接AM,若∠OAM=90°,求a、h、m的值.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/13/2ae72f2b-a8bf-466b-8c18-b9f611d4057a.png?resizew=518)
更新时间:2021-04-11 21:04:42
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【推荐1】如图,在矩形ABCD中,AB=15,BC=8,E是AB上一点,沿DE折叠使A落在DB上,求AE的长.
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【推荐2】如图,四边形
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(1)求证:
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(2)若
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②
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【推荐1】如图,在正方形网格中,每个小正方形的边长均为
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【推荐2】如图,菱形ABCD的对角线AC,BD相交于点O,E是AD的中点,点F,G在AB上,EF⊥AB,OG∥EF.
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(1)求证:四边形OEFG是矩形;
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【推荐1】已知抛物线y=
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【推荐2】如图,在
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(2)除(1)中相似三角形,图中还有其他相似三角形吗?如果有,请把它们都写出来.(证明不做要求)
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【推荐1】如图,在平面直角坐标系中,已知抛物线
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【推荐2】已知抛物线
:
.
的结论正确的有 (填序号).
①开口向下;
②对称轴在y轴的左侧;
③与y轴的交点坐标为
;
④函数值y有最小值
;
(2)当
时,抛物线
的顶点坐标为 ,将抛物线
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翻折得到抛物线
,则抛物线
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(3)如图,设抛物线
与y轴相交于点C,将抛物线
沿直线
翻折,得到抛物线
,抛物线
,
的交点为A,抛物线
的顶点为P.是否存在实数m,使得∠PCA=90°?若存在,请求出m的值;若不存在,请说明理由.
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①开口向下;
②对称轴在y轴的左侧;
③与y轴的交点坐标为
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④函数值y有最小值
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(2)当
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翻折得到抛物线
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
(3)如图,设抛物线
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