如图①,在正方形
中,
,
为对角线
上任意一点(不与
重合),连接
,过点
作
,交线段
于点
.
(1)求证:
;
(2)若
,求证:
;
(3)如图②,连接
交
于点
.若
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3560c763137e37a5dc7611cba12d24e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8f90eb172dbd2ff7ae6f705801c0737.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c90b62aa75a1b3b42af8bb133e043bf8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/14/5c104646-4f6b-4d6e-92b3-aea23a431a81.png?resizew=141)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/173bd72e073523130b84a1a67f452b9a.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c12ad31fd24989bd80a48bc208790510.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d208c644245710f19afe4467314a5f7f.png)
(3)如图②,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dafebaaf13781120dc57c277d0267c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3a8c000a2f16c5d7ed39c04415f2abd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c43a070934739b9e6b51b917ccf6f44b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/14/7ff005ee-e0a7-4f77-905c-30f2c7c061c9.png?resizew=138)
2019·黑龙江绥化·中考真题 查看更多[15]
黑龙江省绥化市2019年中考数学试题2019年广东省佛山市南海区里水镇中考数学模拟试题山东省枣庄市峄城区第二十八中学2019-2020学年九年级上学期期中数学试题广东省深圳市罗湖区罗湖外语学校初中部2019-2020学年九年级上学期第二次月考数学试题2020年山东省枣庄市台儿庄区中考数学一调试卷(一模)广东省揭阳市普宁市2021-2022学年九年级上学期期中数学试题(已下线)专题27.37 相似三角形几何模型-双垂线等角(专项练习)-2021-2022学年九年级数学下册基础知识专项讲练(人教版)2022年广东省广州市黄埔区九年级数学二模试题(已下线)专题4.41 相似三角形几何模型-双垂线等角(知识讲解)-2022-2023学年九年级数学上册基础知识专项讲练(北师大版)(已下线)专题27.36 相似三角形几何模型-双垂线等角(知识讲解)-2022-2023学年九年级数学下册基础知识专项讲练(人教版)甘肃省兰州市安宁区兰州东方学校2022-2023学年九年级上学期期中数学试题(已下线)专题6.39 相似三角形几何模型-双垂线等角(知识讲解)-2022-2023学年九年级数学下册基础知识专项讲练(苏科版)京改版九年级数学上册第18章 相似形 单元测试卷湖北省襄阳市谷城县2022-2023学年九年级上学期期末数学试题(已下线)专题14相似三角形判定定理的证明(2个知识点6种题型1种中考考法)-【帮课堂】2023-2024学年九年级数学上册同步学与练(北师大版)
更新时间:2019-07-17 21:13:57
|
相似题推荐
解答题-证明题
|
较难
(0.4)
解题方法
【推荐1】已知:点O是平行四边形ABCD两条对角线的交点,点P是AC所在直线上的一个动点(点P不与点A、C重合),分别过点A、C向直线BP作垂线,垂足分别为E、F
(1)如图1,当点P与点O重合时,求证:OE=OF
(2)直线BP绕点B逆时针方向旋转,当∠OFE=
时,有OE=OF,如图2,线段CF、AE、OE之间有怎样的数量关系?给出证明.
(3)当点P在图3位置,且∠OFE=
时,线段CF、AE、OE之间有怎样的数量关系?(直接写出结论,无需证明.
(1)如图1,当点P与点O重合时,求证:OE=OF
(2)直线BP绕点B逆时针方向旋转,当∠OFE=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c030b25575d683af91c06e6a3e4f463.png)
(3)当点P在图3位置,且∠OFE=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c030b25575d683af91c06e6a3e4f463.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/28/88069384-c8f4-4b03-aa02-9baecef20a66.png?resizew=445)
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解答题-证明题
|
较难
(0.4)
【推荐2】如图,已知在梯形ABCD中,AD∥BC,∠ABC=∠BCD=45°,BC=8,DE⊥BC,垂足为E,延长DE至F,使得DE=EF,联结AC、BF、CF.
(1)求证:四边形ABFC是平行四边形;
(2)设AD=x,梯形ABCD的面积为y,求y关于x的函数关系式,并写出自变量x的取值范围;
(3)联结AF交BC于点O,如果△AOB是等腰三角形,求AD的长.
(1)求证:四边形ABFC是平行四边形;
(2)设AD=x,梯形ABCD的面积为y,求y关于x的函数关系式,并写出自变量x的取值范围;
(3)联结AF交BC于点O,如果△AOB是等腰三角形,求AD的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/13/7c92eabf-6c24-4592-8d04-d1b90a465267.png?resizew=183)
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解答题-问答题
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【推荐1】如图,在
中,
,
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07140f277a35733d8c97577ccdd4e3ab.png)
,点D从点A出发以
的速度运动到点C停止.作
交边
或
于点E,以
为边向右作正方形
.设点
的运动时间为
.
的长;
(2)当点F在边
上时,求
的值;
(3)设正方形
与
重叠部分图形的面积为
,当重叠部分图形为四边形时,求
关于
的函数解析式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42798067d911f96e5784cb138319c907.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/439a8f6e8ccd03e2bc0df99d372b4ca3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82f36881389561386786a55c699141e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07140f277a35733d8c97577ccdd4e3ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efa9fbcfb9595e2f031aa691db4564b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e7251130c0d245119e067e494e898b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68fbbd17c89f03dbb61cd6ffdb9a0344.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a6c6e7c025362c46a64a8956761f08e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdff15fafea9a3b60d69a1789ef0220a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c8728adf63c69d50003ef5922c65941.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a6c6e7c025362c46a64a8956761f08e.png)
(2)当点F在边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(3)设正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdff15fafea9a3b60d69a1789ef0220a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27edfcf8b9d43514b9bd80289f89b2c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb194fd63b75af067ba10dee7471d299.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
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(0.4)
【推荐2】如图,已知
是
的直径,弦
于点
,
是
上的一点,
,
的延长线交于点
,连结
.
,求
的度数;
(2)若点
是
的中点.
写出
与
的数量关系并证明你的结论;
若
,
,求
的长(用含
的代数式表示).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b757f0c42ae5c9a2d6a4b19e5877b27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/667349d99185bb045030b733352ff7fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7104425c996fb4655295639dc2e89413.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7d74465c34ad7afa5d39d9e300bdf86.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/667349d99185bb045030b733352ff7fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e1c9ae241fd78126274c65e17990c88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c650fe55b7603f106c53ca2423451c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c31ffa51089e341a5f639d6fba58f94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a4467521aabb7683b7dc58f74c8b1c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62ff2912fd8d93b6e692936d95b727c5.png)
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