解答:
(1)如图1,菱形
的顶点E、H在菱形
的边上,且
,请直接写出
的结果(不必写计算过程);
(2)将图1中的菱形
绕点A旋转一定角度,如图2,求
;
(3)把图2中的菱形都换成矩形,如图3,且
,此时
的结果与(2)小题的结果相比有变化吗?如果有变化,求出变化后的结果;若无变化,请说明理由.
(1)如图1,菱形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/344164942bd5946e83cbdf1ceb98c676.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f945a69cf7e8213e50622125cde652f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08fec2a5dde413ffe573455d7a63d71e.png)
(2)将图1中的菱形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/344164942bd5946e83cbdf1ceb98c676.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08fec2a5dde413ffe573455d7a63d71e.png)
(3)把图2中的菱形都换成矩形,如图3,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1da8af4cdcaa06664165a0621094766f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08fec2a5dde413ffe573455d7a63d71e.png)
![](https://img.xkw.com/dksih/QBM/2022/4/23/2968623414272000/2980549580300288/STEM/5f59c37e-ffd0-4453-b656-181cde79cb03.png?resizew=617)
2022·山东泰安·一模 查看更多[2]
更新时间:2022-05-16 11:26:33
|
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解答题-证明题
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较难
(0.4)
【推荐1】在等腰直角
中,
,
,直线
过点
且
.以点
为一锐角顶点作直角
,
,且点
在直线
上(不与点
重合).如图①,
与
交于点
,易证:
(无需写证明过程).
![](https://img.xkw.com/dksih/QBM/2019/7/2/2238232443281408/2238334149492736/STEM/f1b4362a07274ff0b198a19bea4f2096.png?resizew=134)
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(1)在图②中,
与
的延长线交于点
,
是否成立?如果成立,请给予证明,如果不成立,请说明理由.
(2)在图③中,
与
的延长线交于点
,
与
是否相等?请直接写出你的结论,无需证明.
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(1)在图②中,
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(2)在图③中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
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【推荐2】(1)如图1,在锐角
中,分别以
为边向外作等腰
和等腰
,使
,
,
,连接
,
.求证:
.
![](https://img.xkw.com/dksih/QBM/2022/4/26/2966352202031104/2972136022245376/STEM/989ac192b49949ddbe7cd49d513d744a.png?resizew=479)
(2)如图2,在
中,
,D为
上一点,连接
,作
,
,连接
,若
,求四边形
的面积.
(3)如图3,在四边形
中,已知
,求线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dec2ca6438c82b43f746057d8129885.png)
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(2)如图2,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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(3)如图3,在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d0d85c2d46f2b134e2577d0544e1539.png)
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【推荐3】如图,以矩形OABC的顶点O为坐标原点,OA所在直线为x轴,OC所在直线为y轴,建立平面直角坐标系,已知OA=8,OC=10,将矩形OABC绕点O逆时针方向旋转α(0<α<180°)得到矩形ODEF.
(1)当点E恰好落在y轴上时,如图1,求点E的坐标.
(2)连接AC,当点D恰好落在对角线AC上时,如图2,连接EC,EO,
①求证:△ECD≌△ODC;
②求点E的坐标.
(3)在旋转过程中,点M是直线OD与直线BC的交点,点N是直线EF与直线BC的交点,若BM=
BN,请直接写出点N的坐标.
![](https://img.xkw.com/dksih/QBM/2021/4/25/2707212306718720/2716082131361792/STEM/2ce53c52-bf40-480e-97e7-04ecf456e95e.png)
(1)当点E恰好落在y轴上时,如图1,求点E的坐标.
(2)连接AC,当点D恰好落在对角线AC上时,如图2,连接EC,EO,
①求证:△ECD≌△ODC;
②求点E的坐标.
(3)在旋转过程中,点M是直线OD与直线BC的交点,点N是直线EF与直线BC的交点,若BM=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
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解题方法
【推荐1】在正方形
中,点
是对角线
所在直线上的一点;点
在
的延长线上,且
,连接
.
(1)如图1,当点
在线段
上时,线段
与线段
的数量关系是______.
(2)如图2,当点
在
的延长线上时,其它条件不变,则(1)中的结论是否仍然成立?若成立,请予以证明;若不成立,请说明理由;
(3)如图3,把正方形
改为菱形
,其它条件不变,当
时,
①探究线段
与线段
的数量关系,并请直接写出你的结论;
②若
,
,请直接写出
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
(1)如图1,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
(2)如图2,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
(3)如图3,把正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e918b70b02a73685e3c536c7f380e2c.png)
①探究线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/077c956ac0eb05cf120e14f17413dfa2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65ff13b4da65c7da3d898ba58e967b24.png)
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解答题-证明题
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较难
(0.4)
【推荐2】某数学小组在探究四边形的性质时,经历了如下过程:四边形
是菱形,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/4/eecf516b-dc8c-47d8-ac9f-734007624346.png?resizew=486)
(1)【操作发现】如图1,点
是线段
上的一个动点(不与端点重合),连接
,以
为边作等边
,过
点作
于点
,作
于点
,连接
.
①
__________°;②
__________
(填“>”或“<”或“=”).
(2)【数学思考】如图2,点
是线段
延长线上的一个动点(不与端点重合),连接
,以
为边作等边
.
①连接
,求证:点
在
的角平分线上;
②过
点作
,交
于点
,连接
,求证:四边形
是平行四边形;
(3)【类比探索】如图3,若
点不在直线
上时,以
为边作等边
,连接
并延长,交
于点
,连接
,求
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/4/eecf516b-dc8c-47d8-ac9f-734007624346.png?resizew=486)
(1)【操作发现】如图1,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f2ea13010e2399194be2a681310543e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfbc4cad609f3cfdee8a17941ef1273e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b43890e9b5cebbe8b7066c6cf46dfa1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7337193a22ac012ca750c1dbac73bb8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5c2293f93791a597bf0162411f3395f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632917e61f4208959686d118c7f19231.png)
(2)【数学思考】如图2,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f2ea13010e2399194be2a681310543e.png)
①连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/727ad3e630a224303d6d3b8ad5c114ba.png)
②过
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc4042e4acd0e823c2a69ce8bee3b995.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f46b357e543eb2e895d0ea4742f4546.png)
(3)【类比探索】如图3,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f2ea13010e2399194be2a681310543e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2f9c3b578fc0598d5ec6c79404c6cc2.png)
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解答题-问答题
|
较难
(0.4)
名校
【推荐1】在平面直角坐标系中,
为原点,点
,点
.若正方形
绕点
顺时针旋转,得正方形
,记旋转角为
.
![](https://img.xkw.com/dksih/QBM/2019/3/28/2170312639602688/2170851735601152/STEM/31daf1cb8f8542198384d69093e24abf.png?resizew=387)
(Ⅰ)如图①,当
时,求
与
的交点
的坐标;
(Ⅱ)如图②,当
时,求点
的坐标;
(Ⅲ)若
为线段
的中点,求
长的取值范围(直接写出结果即可).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b078585c75524673305d270e9eefab89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c83ebc472717d6ddeeeabeb6dff738a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241d7fedd89d85711acd7a2635298af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0c50654d011b19a3ab03dbcaa4b5cdf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://img.xkw.com/dksih/QBM/2019/3/28/2170312639602688/2170851735601152/STEM/31daf1cb8f8542198384d69093e24abf.png?resizew=387)
(Ⅰ)如图①,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c69a23d106fd34aa17b22e9c9a8de36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fc890342ba48792f572f99e3f8c033a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(Ⅱ)如图②,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97cf714ffb3fd5917a76b191640b55fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c5d54dfb9237412a7c1c00658830de6.png)
(Ⅲ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa78ace12e5dca050ba2c70880d4d8ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
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解答题-问答题
|
较难
(0.4)
【推荐2】已知抛物线
经过点
和点
,抛物线的顶点为点
.
(1)求抛物线的表达式及顶点
;
(2)点
在对称轴上,且在
点下方,将点
绕点
顺时针旋转
得到点
,点
恰好落在抛物线上,求点
的坐标;
(3)在(2)的条件下,点
在抛物线的对称轴上(点
在点
的下方),四边形
的面积为12,求
的正切值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0c9800e4b992044d16681e77ff6563c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a91df96d2cbc7e1b65d610ef00123128.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b83a87f55e2ee372668e82c4a0d4697a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/30/c0a3730f-b98d-40a5-a5ad-b8c6d1284be2.png?resizew=308)
(1)求抛物线的表达式及顶点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
(3)在(2)的条件下,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f416ef43a6e030b2d124c6a29cb28964.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b722d58e08c10e360dafb52bb73515ab.png)
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解答题-证明题
|
较难
(0.4)
【推荐1】如图,AB是⊙O的直径.CD⊥AB于点E,G是BC上任意一点,连接GD交AB于点F,连接AD,AG.
![](https://img.xkw.com/dksih/QBM/2021/6/13/2741849748307968/2743009291894784/STEM/fdac58c22c834219aae46ee6fac889fe.png?resizew=137)
(1)求证:∠ADC=∠AGD.
(2)若CD=AG,
①求证:△ADG是等腰三角形.
②连接BG,若BF=2,BG=3,求⊙O的半径.
![](https://img.xkw.com/dksih/QBM/2021/6/13/2741849748307968/2743009291894784/STEM/fdac58c22c834219aae46ee6fac889fe.png?resizew=137)
(1)求证:∠ADC=∠AGD.
(2)若CD=AG,
①求证:△ADG是等腰三角形.
②连接BG,若BF=2,BG=3,求⊙O的半径.
您最近一年使用:0次
解答题-证明题
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较难
(0.4)
【推荐2】某数学兴趣小组在数学课外活动中,对多边形内两条互相垂直的线段做了如下探究:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/6/efee898d-e067-42a3-bddb-b5fa89be1042.png?resizew=590)
(1)【观察与猜想】如图1,在正方形ABCD中,点E,F分别是AB,AD上的两点,连接DE,CF,
,则
的值为______;
(2)如图2,在矩形ABCD中,
,
,点E是AD上的一点,连接CE,BD,且
,则
的值为______;
(3)【类比探究】如图3,在四边形ABCD中,
,点E为AB上一点,连接DE,过点C作DE的垂线交ED的延长线于点G,交AD的延长线于点F,求证:
;
(4)【拓展延伸】如图4,在
中,
,
,
,将
沿BD翻折,点A落在点C处得
,点E,F分别在边AB,AD上,连接DE,CF,
垂足为G,连接EF,若
,求EF的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/6/efee898d-e067-42a3-bddb-b5fa89be1042.png?resizew=590)
(1)【观察与猜想】如图1,在正方形ABCD中,点E,F分别是AB,AD上的两点,连接DE,CF,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1f87b02b744534ae1ed700d21fcceb4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ada5e380d6b5b2066e34497e5f0baf0.png)
(2)如图2,在矩形ABCD中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/267ace52b64e1e7dfc5211e033255b7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e673ef2d48215ca84a48377f17d6df00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a45b04cc3e5adaeff6f9e01e29032803.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8775dcf60ad143bc59a58b000f374c56.png)
(3)【类比探究】如图3,在四边形ABCD中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41aba1711910c6f533cc94319104f4fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccb545c1a90c841d0d25070cf62b64e3.png)
(4)【拓展延伸】如图4,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16834582e86f9c1030a4a4b316fab909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce0d7095ddd69d6ceaf1065b1bc2c79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04ee826937d2add7a93aaa1422f8b736.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73636989e83905f8800a865c2b608c43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1f87b02b744534ae1ed700d21fcceb4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50f218914337edd06e59e75d90b777e6.png)
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