如图①,点P是∠AOB的平分线OC上的一点,我们可以分别OA、OB在截取点M、N,使OM=ON,连结PM、PN,就可得到
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/1/ad952372-2e6c-4ab9-a1b0-259ebf7b75d2.png?resizew=496)
(1)请你在图①中,根据题意,画出上面叙述的全等三角形
和
,并加以证明.
(2)请你参考(1)中的作全等三角形的方法,解答下列问题:
(Ⅰ)如图②,在△ABC中,∠ACB是直角,∠B=60°,AD、CE分别是∠BAC、∠BCA的平分线,AD、CE相交于点F.请你判断并写出FE与FD之间的数量关系.
(Ⅱ)如图③,在△ABC中,如果∠ACB不是直角,而(1)中的其它条件不变,请问,你在(Ⅰ)中所得结论是否仍然成立?若成立,请证明;若不成立,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/139500a4ec7e89d5c14b9ed087cfaff8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/1/ad952372-2e6c-4ab9-a1b0-259ebf7b75d2.png?resizew=496)
(1)请你在图①中,根据题意,画出上面叙述的全等三角形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1addaf4de4d91f3553f7d0e5579fa92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a04498a3ea087bdd04cd3d77b070b35.png)
(2)请你参考(1)中的作全等三角形的方法,解答下列问题:
(Ⅰ)如图②,在△ABC中,∠ACB是直角,∠B=60°,AD、CE分别是∠BAC、∠BCA的平分线,AD、CE相交于点F.请你判断并写出FE与FD之间的数量关系.
(Ⅱ)如图③,在△ABC中,如果∠ACB不是直角,而(1)中的其它条件不变,请问,你在(Ⅰ)中所得结论是否仍然成立?若成立,请证明;若不成立,请说明理由.
更新时间:2020-01-04 21:53:35
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解答题-证明题
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【推荐1】实验证明,平面镜反射光线的规律是:射到平面镜上的光线和被反射出的光线与平面镜所夹的锐角相等.如图1,一束光线m射到平面镜a上,被a反射后的光线为n,则入射光线m、反射光线n与平面镜a所夹的锐角∠1=∠2.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/22/b3e1bf37-d6eb-4348-b3c1-9aefe53a3fbe.png?resizew=419)
(1)如图2,一束光线m射到平面镜a上,被a反射到平面镜b上,又被b反射.若被b反射出的光线n与光线m平行,且∠1=50°,则∠2= °,∠3= °.
(2)请你猜想:当射到平面镜a上的光线m,经过平面镜a、b的两次反射后,入射光线m与反射光线n平行时,两平面镜a、b间的夹角∠3的大小是否为定值?若是定值,请求出∠3,若不是定值,请说明理由.
(3)如图3,两面镜子的夹角为α°(0<α<90),进入光线与离开光线的夹角为β°(0<β<90).试探索α与β的数量关系,并说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/22/b3e1bf37-d6eb-4348-b3c1-9aefe53a3fbe.png?resizew=419)
(1)如图2,一束光线m射到平面镜a上,被a反射到平面镜b上,又被b反射.若被b反射出的光线n与光线m平行,且∠1=50°,则∠2= °,∠3= °.
(2)请你猜想:当射到平面镜a上的光线m,经过平面镜a、b的两次反射后,入射光线m与反射光线n平行时,两平面镜a、b间的夹角∠3的大小是否为定值?若是定值,请求出∠3,若不是定值,请说明理由.
(3)如图3,两面镜子的夹角为α°(0<α<90),进入光线与离开光线的夹角为β°(0<β<90).试探索α与β的数量关系,并说明理由.
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【推荐2】当光线经过镜面反射时,入射光线、反射光线与镜面所夹的角对应相等.例如:在图①、图②中,都有
,
.设镜子
与
的夹角
.
,判断入射光线
与反射光线
的位置关系,并说明理由;
(2)如图②,若
,入射光线
与反射光线
的夹角
.探索
与
的数量关系,并说明理由;
(3)如图③,若
,设镜子
与
的夹角
,入射光线
与镜面
的夹角
,已知入射光线
从镜面
开始反射,经过
为正整数,且
次反射,当第
次反射光线与入射光线
平行时,请直接写出
的度数.(可用含有
的代数式表示)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/682dc163baa74e18746d3d52da6cff7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/597ce705d3a2fe04d29de9e81ec6250d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33ac762a2899a58faa0d3ab44f1281fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42887d9bf31c1dd99f13c39e63c9ab9.png)
(2)如图②,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13b5ea2fc43b19ca043581eb94197234.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42887d9bf31c1dd99f13c39e63c9ab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8bea54c9ce23e39275f2e79eca3839d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
(3)如图③,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/908b807af6761e43117cef8f16a6dc7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0235d78ca0fb06cc349b3df512146eb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eabc3fb6cfe0c3126dd9cb3a65fec0b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ede9197696187ece75627fdfcb1772e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2df2fac1c6e6ed1b42dbabe868b7bb09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f435efcc7869eec21bdba1ed81dc3f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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【推荐3】【问题探究】
(1)如图1,在四边形
中,
与
互补,
与
互补,
,
,
,数学兴趣小组在探究y与x的数量关系时,经历了如下过程:
①数学兴趣小组通过电脑软件“几何画板”进行探究,测量出部分结果如下表所示:
这里
________,
________,
________;
②根据表格,猜想:y与x之间的关系式为________;
③数学兴趣小组发现证明此猜想的一种方法:如图2,延长
到E,使
,连接
,…,请你根据其思路将证明过程补充完整.
(2)如图3,D为
边
上一点,
,其中
,
,
,若
,
的面积为14,求
的面积.
(1)如图1,在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/727ad3e630a224303d6d3b8ad5c114ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c543c3ddc3723fde6bbfca3ea3b921b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e735a28578ba191da6d4f3b0f8e8729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ad72ec2ef4023145d3564fa3d33d49e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/019f31cda4344b736125364f4f07c6a0.png)
①数学兴趣小组通过电脑软件“几何画板”进行探究,测量出部分结果如下表所示:
x | … | 30 | 40 | 50 | 60 | 70 | 80 | 100 | θ | … |
y | … | 75 | 70 | 65 | 60 | α | 50 | β | 25 | … |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9251dff989f7d60db751b73033dee269.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90ca3f0a4b2d06539e74594736881aaa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b657cfa91b6394e4b00fa385a2c0149.png)
②根据表格,猜想:y与x之间的关系式为________;
③数学兴趣小组发现证明此猜想的一种方法:如图2,延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/024dc2ccbbe321774df5d44e8785b203.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
(2)如图3,D为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e735a28578ba191da6d4f3b0f8e8729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82b74e2b6dae540571fdd509c4e966b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88cfc157655905bce388b9055c4bc036.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8b1dcdda556a48f1170776380132947.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b7833469efdedff038892afe454ea18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
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【推荐1】在“学本课堂”的实践中,王老师经常让学生以“问题”为中心进行自主、合作、探究学习.
![](https://img.xkw.com/dksih/QBM/2019/11/20/2337540056702976/2338019279396864/STEM/e87ee24e38d44baa92f07b316fa8ba26.png?resizew=158)
【课堂提问】王老师在课堂中提出这样的问题:如图1,在Rt△ABC中,∠ACB=90°,∠BAC=30°,那么BC和AB有怎样的数量关系?
【互动生成】经小组合作交流后,各小组派代表发言.
(1)小华代表第3小组发言:AB=2BC. 请你补全小华的证明过程.
证明:把△ABC沿着AC翻折,得到△ADC.
∴∠ACD=∠ACB=90°,
∴∠BCD=∠ACD+∠ACB=90°+90°=180°,
即:点B、C、D共线.
(请在下面补全小华的证明过程)
(2)受到第3小组“翻折”的启发,小明代表第2小组发言:如图2,在△ABC中,如果把条件“∠ACB=90°”改为“∠ACB=135°”,保持“∠BAC=30°”不变,若BC=1,求AB的长.
![](https://img.xkw.com/dksih/QBM/2019/11/20/2337540056702976/2338019279396864/STEM/1c22eb5b08fc42bba00b88f9d7f8d395.png?resizew=122)
【能力迁移】我们发现,翻折可以探索图形性质,请利用翻折解决下面问题.
如图3,点D是△ABC内一点,AD=AC,∠BAD=∠CAD=20°,∠ADB+∠ACB=210°,则AD、DB、BC三者之间的数量关系是 .
![](https://img.xkw.com/dksih/QBM/2019/11/20/2337540056702976/2338019279396864/STEM/252fa4668b2d4da7892049ef6ab76b20.png?resizew=132)
【课后拓展】如图4,在四边形ABCD中,∠BCD=45°,∠BAD=90°,∠ADB=∠CDB=60°,且AC=1,
则△ABD的周长为 .
![](https://img.xkw.com/dksih/QBM/2019/11/20/2337540056702976/2338019279396864/STEM/e87ee24e38d44baa92f07b316fa8ba26.png?resizew=158)
【课堂提问】王老师在课堂中提出这样的问题:如图1,在Rt△ABC中,∠ACB=90°,∠BAC=30°,那么BC和AB有怎样的数量关系?
【互动生成】经小组合作交流后,各小组派代表发言.
(1)小华代表第3小组发言:AB=2BC. 请你补全小华的证明过程.
证明:把△ABC沿着AC翻折,得到△ADC.
∴∠ACD=∠ACB=90°,
∴∠BCD=∠ACD+∠ACB=90°+90°=180°,
即:点B、C、D共线.
(请在下面补全小华的证明过程)
(2)受到第3小组“翻折”的启发,小明代表第2小组发言:如图2,在△ABC中,如果把条件“∠ACB=90°”改为“∠ACB=135°”,保持“∠BAC=30°”不变,若BC=1,求AB的长.
![](https://img.xkw.com/dksih/QBM/2019/11/20/2337540056702976/2338019279396864/STEM/1c22eb5b08fc42bba00b88f9d7f8d395.png?resizew=122)
【能力迁移】我们发现,翻折可以探索图形性质,请利用翻折解决下面问题.
如图3,点D是△ABC内一点,AD=AC,∠BAD=∠CAD=20°,∠ADB+∠ACB=210°,则AD、DB、BC三者之间的数量关系是 .
![](https://img.xkw.com/dksih/QBM/2019/11/20/2337540056702976/2338019279396864/STEM/252fa4668b2d4da7892049ef6ab76b20.png?resizew=132)
【课后拓展】如图4,在四边形ABCD中,∠BCD=45°,∠BAD=90°,∠ADB=∠CDB=60°,且AC=1,
则△ABD的周长为 .
![](https://img.xkw.com/dksih/QBM/2019/11/20/2337540056702976/2338019279396864/STEM/fb9e3cdb913d4c28a912196c65cd489f.png?resizew=141)
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【推荐2】解答下列问题.
(1)【问题探究】如图
,有公共顶点
的两个正方形
和正方形
,
,连接
与
,请判断线段
与线段
之间有怎样的数量关系和位置关系,并请说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/7/d4d313b3-7b89-41d9-b868-d891cf975108.png?resizew=175)
(2)【理解应用】如图
,有公共顶点
的两个正方形
和正方形
,
,
,将正方形
绕点
在平面内任意旋转,当
,且点
,
,
三点在同一条直线上时,请直接写出
的长 .
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/7/ebf45567-3ed2-4cb5-b0c5-8c914332f94f.png?resizew=150)
(3)【拓展应用】如图
,有公共顶点
的两个矩形
和矩形
,
,
,
,
,将矩形
绕点
在平面内任意旋转,连接
,
,点
,
分别是
,
的中点,连接
,当点
,
,
三点在同一条直线上时,请直接写出
的长 .
(1)【问题探究】如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8d0e8404f347a0eb4c76f4d25d9bdac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d7f21876f1112f7a64388f7719eb488.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/7/d4d313b3-7b89-41d9-b868-d891cf975108.png?resizew=175)
(2)【理解应用】如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8d0e8404f347a0eb4c76f4d25d9bdac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d7f21876f1112f7a64388f7719eb488.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc34db5860990e51ba31edc8cdd077c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8d0e8404f347a0eb4c76f4d25d9bdac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f1950317eebbb270c4e67b35f0f19f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.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/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/7/ebf45567-3ed2-4cb5-b0c5-8c914332f94f.png?resizew=150)
(3)【拓展应用】如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8d0e8404f347a0eb4c76f4d25d9bdac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cd8dd7c007bfb1802cddff945f0b14e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8aaff238524d90f6657414f38bd249c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93401a1551b7e3c5bda0c9bb7220e01a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9100eadeba8de498bad6bc9189433d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8d0e8404f347a0eb4c76f4d25d9bdac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.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/411461db15ee8086332c531e086c40c7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/7/2c64541c-cec2-4102-b885-b5ef394f5221.png?resizew=182)
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解答题-作图题
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较难
(0.4)
【推荐1】阅读下面材料,完成相应的任务:
![](https://img.xkw.com/dksih/QBM/2019/10/17/2313874115911680/2313948260294656/STEM/92442cc2ed5b4830ba00af37119a3125.png?resizew=455)
(1)小明在研究命题①时,在图1的正方形网格中画出两个符合条件的四边形,由此判断命题①是 命题(填“真”或“假”);
(2)小彬经过探究发现命题②是真命题,请你结合图2证明这一命题;
(3)小颖经过探究又提出了一个新的命题:“若AB=A′B′,BC=B′C′,CD=C′D' , ,则四边形ABCD≌四边形A′B′C′D′,请在横线上填写两个关于“角”的条件,使该命题为真命题.
![](https://img.xkw.com/dksih/QBM/2019/10/17/2313874115911680/2313948260294656/STEM/92442cc2ed5b4830ba00af37119a3125.png?resizew=455)
(1)小明在研究命题①时,在图1的正方形网格中画出两个符合条件的四边形,由此判断命题①是 命题(填“真”或“假”);
(2)小彬经过探究发现命题②是真命题,请你结合图2证明这一命题;
(3)小颖经过探究又提出了一个新的命题:“若AB=A′B′,BC=B′C′,CD=C′D' , ,则四边形ABCD≌四边形A′B′C′D′,请在横线上填写两个关于“角”的条件,使该命题为真命题.
![](https://img.xkw.com/dksih/QBM/2019/10/17/2313874115911680/2313948260294656/STEM/9b109797149a4bff9f1bfcead3a82029.png?resizew=395)
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解答题-作图题
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较难
(0.4)
【推荐2】如图,在菱形
中,点
为
边上一点,请仅用无刻度直尺 分别按下列要求画图.(保留画图痕迹)
(1)在图1中,在
边画出一点
,使
;
(2)在图2中,以
为顶点画一个矩形,使得矩形的四个顶点都在菱形的边上.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/20/a7faf1c0-4537-4baa-ac60-0e47471538a9.png?resizew=390)
(1)在图1中,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f40b3bf6b27f936e0747de92151a1f77.png)
(2)在图2中,以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
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解答题-作图题
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较难
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解题方法
【推荐1】如图,已知抛物线L:y=ax2+bx+c经过点A(-3,0)、B(0,4)和F(4,0).
![](https://img.xkw.com/dksih/QBM/2020/7/2/2497308481699840/2498133759074304/STEM/24ab3db9343248ada2bd554c4403988f.png?resizew=190)
(1)求抛物线L的解析式;
(2)在图①抛物线L上,求作点C(保留作图痕迹,不写作法),使∠BAC=∠FAC,并求出点C的坐标;
(3)在图①中,若点D为抛物线上一动点,过点D作DH⊥x轴于点H,交直线AC于点G,过点C作CK⊥x轴于点K,连接DC,当以点G,C,D为顶点的三角形与△ACK相似时,求点D的坐标.
![](https://img.xkw.com/dksih/QBM/2020/7/2/2497308481699840/2498133759074304/STEM/116bdb3043ad42109d92e3ec8d5dea60.png?resizew=195)
![](https://img.xkw.com/dksih/QBM/2020/7/2/2497308481699840/2498133759074304/STEM/24ab3db9343248ada2bd554c4403988f.png?resizew=190)
(1)求抛物线L的解析式;
(2)在图①抛物线L上,求作点C(保留作图痕迹,不写作法),使∠BAC=∠FAC,并求出点C的坐标;
(3)在图①中,若点D为抛物线上一动点,过点D作DH⊥x轴于点H,交直线AC于点G,过点C作CK⊥x轴于点K,连接DC,当以点G,C,D为顶点的三角形与△ACK相似时,求点D的坐标.
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解答题-证明题
|
较难
(0.4)
名校
【推荐2】阅读以下材料,并按要求完成相应的任务.
《数学的发现》是2006年科学出版社出版的图书,作者是(美)乔治·波利亚.本书通过对各种类型生动而有趣的典型问题(有些是非数学的))进行细致剖析,提出它们的本质特征,从而总结出各种数学模型.
共高三角形:有一条公共高的三角形称为共高三角形.
共高定理:如图①,设点M在直线
上,点P为直线外一点,则有![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c318711715cdaa8e002da34918989062.png)
下面是该结论的证明过程:证明:如图①,过点P作
于点Q,
......
按要求完成下列任务:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/4/9c544dd3-d989-4dba-a957-891fa1700044.png?resizew=460)
(1)请你按照以上证明思路,结合图①完成剩余的证明;
(2)如图②,
,
①画出
的平分线(不写画法,保留作图痕迹,使用2B铅笔作图);
②若
的平分线交
于D,求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a02bad7fac070822f4c8b4f8b64bda72.png)
(3)如图③,E是平行四边形
边
上一点,连接
并延长,交
的延长线于点F,连接
,若
的面积为2,则
的面积为 ;
《数学的发现》是2006年科学出版社出版的图书,作者是(美)乔治·波利亚.本书通过对各种类型生动而有趣的典型问题(有些是非数学的))进行细致剖析,提出它们的本质特征,从而总结出各种数学模型.
共高三角形:有一条公共高的三角形称为共高三角形.
共高定理:如图①,设点M在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c318711715cdaa8e002da34918989062.png)
下面是该结论的证明过程:证明:如图①,过点P作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d84733f9dc908ceb11459cc2aed580ab.png)
......
按要求完成下列任务:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/4/9c544dd3-d989-4dba-a957-891fa1700044.png?resizew=460)
(1)请你按照以上证明思路,结合图①完成剩余的证明;
(2)如图②,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
①画出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a02bad7fac070822f4c8b4f8b64bda72.png)
(3)如图③,E是平行四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21b1efb5d9072a67be9d5497a783016c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ff39c7aa648afd1080206c8080ff79e.png)
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