名校
1 . 如图,矩形ABCD的长AD=9cm,宽AB=3cm,将其折叠,使点D与点B重合,那么折叠后DE的长和折痕EF的长分别为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/15/2517244b-8950-4951-a9f6-8f7ffe0f02e6.png?resizew=309)
A.4cm ,![]() | B.5cm ,![]() |
C.4cm ,![]() | D.5cm, ![]() |
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2 . 如图,在矩形ABCD中,
,对角线相交于点O,动点M从点B向点A匀速运动(到点A即停止),点N是AD上一动点,且满足
,连接MN,在点M、N运动过 程中,则以下结论中正确的有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a09e2ad192430db0c0b1c736d727807.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a51322acafd53c29ce5c7444d3649cb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/9/c706c888-5b8a-43ec-a80d-0ab2b4cb1969.png?resizew=167)
A.△AMN和△MON的面积不可能相等 | B.点M、N的运动速度不相等 |
C.△AMN的面积先减小再增大 | D.![]() |
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3 . 如图,直线
与坐标轴交于
、
两点,点
是线段
上的一个动点,过点
作
轴的平行线交直线
于点
,
绕点
顺时针旋转
,边
扫过区域(阴影部分)面积的最大值是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9427de5d22d37859a110dbb234313c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](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/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/812eed46a589bde8b7c78a81a8cf9b9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea1f0417d8269f01d8e0bc1a8756e2ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1e5fa72f2878b476bc57f0df12d6555.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/9/65ea167a-2137-4a4b-9239-6019043a64ed.png?resizew=175)
A. ![]() | B.![]() | C.![]() | D.![]() |
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4 . 如图,等腰
中,顶角
,用尺规按①到④的步骤操作:
①以O为圆心,
为半径画圆;
②在⊙O上任取一点P(不与点A,B重合),连接
;
③作
的垂直平分线与⊙O交于M,N;
④作AP的垂直平分线与⊙O交于E,F.
结论I:在⊙O上有两个点P,使得
;
结论II:顺次连接M,
,N,F四点必能得到矩形.
对于结论I和II,下列判断正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/866b81a8384cce4f24867baca2e6820c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e60b66545def38ae9187cc1dcfa60d6.png)
①以O为圆心,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
②在⊙O上任取一点P(不与点A,B重合),连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
③作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
④作AP的垂直平分线与⊙O交于E,F.
结论I:在⊙O上有两个点P,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd304db20219cfa1d5a6b13ab93559a.png)
结论II:顺次连接M,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
对于结论I和II,下列判断正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/9/fbed52e7-c27c-465f-aeb9-d4f1ef93539a.png?resizew=151)
A.I和II都对 | B.I和II都不对 | C.I不对II对 | D.I对II不对 |
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5 . 已知抛物线
与直线
有两个交点
,
,抛物线
与直线
的一个交点是
,则m的值是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6ddc0a29bfef85c1441d02ff117a183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c50866229ec5a3640fb250f9bd2192b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a16a46f03535c5af872fa8fa9f21a431.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d49a31f8e8dba418bd5d886998ef8d17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a97d52d5567e06d42d72842339602042.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c50866229ec5a3640fb250f9bd2192b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2157b41548f02a86a438e63238719841.png)
A.![]() | B.![]() | C.6或2 | D.![]() ![]() |
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6 . 如图,将一张圆形纸片(圆心为点O)沿直径MN对折后,按图1分成六等份折叠得到图2,将图2沿虚线BA剪开,再将△AOB展开得到如图3的一个六角星,若
,则∠OBA的度数为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40bc83b0ba099574d800d84c2c32d52.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/7/1aea8b5e-9359-488d-9299-26eaa460a040.png?resizew=412)
A.![]() | B.![]() | C.![]() | D.![]() |
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7 . 甲和乙两个几何体都是由大小相同的小立方块搭成,它们的俯视图如图,小正方形中数字表示该位置上的小立方块个数,下列说法正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/7/007fc7c4-9295-48c1-abdf-dfc9e456c2a1.png?resizew=186)
A.甲和乙左视图相同,主视图相同 | B.甲和乙左视图相同,主视图不相同 |
C.甲和乙左视图不相同,主视图相同 | D.甲和乙左视图不相同,主视图不相同 |
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解题方法
8 . 已知如图在Rt△OAB中,
.若以O为坐标原点,OA所在直线为x轴,建立如图所示的平面直角坐标系,点B在第一象限内.将Rt△OAB沿OB折叠后,点A落在第一象限内的点C处.
(1)求点C的坐标;
(2)若抛物线
经过C、A两点,求此抛物线的解析式;
(3)若抛物线的对称轴与OB交于点D,点P为线段DB上一点,过P作y轴的平行线,交抛物线于点M.问:是否存在点P,使得
?若存在,请求出此时点P的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f06bf2e0e04d12c41025fa476bc765.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/1/5f12fa00-9c1a-4558-b13f-f2001f3321b4.png?resizew=118)
(1)求点C的坐标;
(2)若抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62df6feec0736be43171e25089d12677.png)
(3)若抛物线的对称轴与OB交于点D,点P为线段DB上一点,过P作y轴的平行线,交抛物线于点M.问:是否存在点P,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b187c822e41bd763d1a7a3a1f4a929ed.png)
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9 . 如图,在矩形ABCD中,DE平分∠ADC时,将△ABE沿AE折叠至△AFE,点F恰好落在DE上.
(1)求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2b34233772c4c26d6669499d9b1f15a.png)
(2)如图,延长CF交AE于点G,交AB于点H.
①求证:
;
②求
的值.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/1/459fe26e-22b8-421b-af21-cb1bfefaf4fc.png?resizew=378)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2b34233772c4c26d6669499d9b1f15a.png)
(2)如图,延长CF交AE于点G,交AB于点H.
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/245f8f7bc4a3e71d38fca7a19a7ab8d3.png)
②求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/624cf36a6102fe01057b25d72aa5462b.png)
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10 . 如图,在△ABC中,
,以AB为直径的圆交BC于点D,连接AD,点P是AD上一点,过点C作
,延长BP交AC于E,交CF于F,若
则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9985eaef9e31b243d5aaf89b71f66075.png)
___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5239ba27ddab40a89c0c450f321065e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35d8a838b6822cce51517d96fc145dc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9985eaef9e31b243d5aaf89b71f66075.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/31/3488b290-11ea-4028-ac98-e798cd82a72a.png?resizew=110)
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