1 . 如图,已知点D是
的边
上一点,
于点 E.
的垂线,垂足为点 F(要求尺规作图,保留作图痕迹,不写作法);
(2)猜想与应用:在(1)的条件下,如图2,若点M是
的中点,试猜想线段
与
的数量关系,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b937442ad4cc480adc11bb143559454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/782a7b8656a7ad52519d7f2079ed6114.png)
(2)猜想与应用:在(1)的条件下,如图2,若点M是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ce6c0e9de83f2e64ae33609fc08459d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/907d5147cea4c9ce855074864fe54506.png)
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2 . 如图,
为平行四边形
的对角线.
(1)实践与操作:利用尺规作对角线
的垂直平分线,分别交
于点E,F,O(要求:尺规作图并保留作图痕迹,不写作法,标明字母);
(2)猜想与证明:连接
.试猜想四边形
是什么特殊四边形?并加以证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/1/2725ee59-55b4-4e28-a3e6-466a216a2ad4.png?resizew=192)
(1)实践与操作:利用尺规作对角线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e1ecefcd888e9495e9b3f549bff82ef.png)
(2)猜想与证明:连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf22927eb6819a02978ef0c6b101f6f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2330c01a4d2b5b20f106e3e48834d5c0.png)
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2023-08-24更新
|
117次组卷
|
2卷引用:河南省郑州市中原区第七十三中学2023-2024学年九年级上学期10月月考数学试题
3 . 如图,在四边形
中,
且
,连接
.
(1)尺规作图:作
的平分线
交
于点E(保留作图痕迹,不写作法);
(2)在(1)的基础上,若
,请探究
与
有何数量关系,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9060f03b9ee41d70d135b1e1a8902ce9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/293088bf0b06d2d299f6c990bdac14ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/17/37bf6698-bf06-4494-8f85-a818d6945103.png?resizew=143)
(1)尺规作图:作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3981e7286d41960daf4e110c1c84e03a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(2)在(1)的基础上,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/615fc8790237a1b09af51d6bcad6b595.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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2023-08-12更新
|
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2卷引用:河南省郑州市巩义市2022-2023学年八年级上学期期末数学试题
真题
4 . 如图,在平行四边形ABCD中,AD>AB.
(2)若(1)中所作的角平分线交AD于点E,AF⊥BE,垂足为点O,交BC于点F,连接EF.求证:四边形ABFE为菱形.
(2)若(1)中所作的角平分线交AD于点E,AF⊥BE,垂足为点O,交BC于点F,连接EF.求证:四边形ABFE为菱形.
您最近一年使用:0次
2016-12-05更新
|
1645次组卷
|
9卷引用:【市级联考】河南省郑州市2019届九年级上学期期末考试数学试题2
5 . 下面是某数学兴趣小组用尺规作图“作一条线段的三等分点”的过程,请认真阅读并完成相应的任务.
如图1,①分别以点A,B为圆心,大于
的长为半径在AB两侧画弧,四段弧分别交于点C,点D;②连接
,
,
,作射线
;③以D为圆心,
的长为半径画弧,交射线
于点E;④连接
,分别交
,
于点F,点H.点F即为
的三等分点(即
).
任务:
(1)填空:四边形
的形状是______,你的依据是______;
(2)在证明点F为
的三等分点时,同学们有不同的思路.
小明:我是先证明
,再通过证明
得到结论的;
小亮:我是通过证明—次三角形相似得到结论的;
小颖:我是通过作辅助线……;
请你选择一种自己喜欢的思路给出证明;
(3)如图2,若
,
,将
绕着点C逆时针旋转,当点H的对应点
落在直线
上时,请直接写出
的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/8/33cc260d-0d43-439d-8884-7034d593d50e.png?resizew=469)
如图1,①分别以点A,B为圆心,大于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20d49404351575703cfe8325d1352ec9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e77686cf448ff6cea9bfc021581da83.png)
任务:
(1)填空:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae33911e41aa2f7004cc01e336f96bf0.png)
(2)在证明点F为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
小明:我是先证明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2d22e4bd48ef5778d6af3f131e301f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bd175ccfa4a0a500752b2a9c7c759a4.png)
小亮:我是通过证明—次三角形相似得到结论的;
小颖:我是通过作辅助线……;
请你选择一种自己喜欢的思路给出证明;
(3)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33b528818e98c5c2ddf301048b4228d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33c99fc553ecb3e2afdb7058201bc642.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6655e2fa64a32cd12fe0279afd65d73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d955d197e2ecbfe724570663efcf2a2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00bab17635a999236e8d2e35017a208d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ebbcc3042e6667b5df17ca4d27678ba.png)
您最近一年使用:0次
2023-05-24更新
|
257次组卷
|
5卷引用:河南省郑州市登封市直属第一初级中学2023-2024学年九年级下学期3月考试数学试题
6 . 小宇将一个含
的三角板绕着等边
中
边上的一点E旋转,如图所示,三角板短直角边、斜边分别与边
、
交于点D、点F,当
时,得到图1,作点E关于
的对称点G,连接
,
.
与
的数量关系是______,
的度数为______.
(2)①证明
;
②证明四边形
是平行四边形.
(3)当
,
时,直接写出
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f805768a5ffaf8bdfa4bc3b680aafdc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d890499dca9a8ef30addafe41d6e771.png)
(2)①证明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcd704a2d2a79bc8afcbd2c2655d5198.png)
②证明四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2db1150b3412830a3ac67975543e8dff.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ca4ac471d3fb5f7156c69a249f4f225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36f11400237c043dc9822dde349513d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d3e081637bcea5368cc72370bae283b.png)
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7 . 小明想知道一堵墙上点A到地面的高度AO,AO⊥OD,但又没有直接测量的工具,于是设计了下面的方案,请你先补全方案,再说明理由.
第二步:使直杆顶端竖直缓慢下滑,直到
,标记此时直杆的底端点D;
第三步:测量 的长度,即为点A到地面的高度AO.
请说明小明这样测量的理由.
第二步:使直杆顶端竖直缓慢下滑,直到
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8a565c57acf1689fc82e8eb912beab2.png)
第三步:测量 的长度,即为点A到地面的高度AO.
请说明小明这样测量的理由.
您最近一年使用:0次
2022-07-09更新
|
302次组卷
|
4卷引用:河南省郑州市金水区实验中学2022-2023学年七年级下学期期末数学试题
名校
8 . 【问题发现】小明在一次利用三角板作图的过程中发现了一件有趣的事情:如图
,在
中,
,点
和点
分别是斜边
上的动点,并且满足
,分别过点
和点
作
边的垂线,垂足分别为点
和点
,那么
的值是一个定值.
问题:若
时,
值为___________ ;
【操作探究】如图
,在
中,
;
爱动脑筋的小明立即拿出另一个三角板进行了验证,发现果然和之前发现的结论一样,于是他猜想,对于任意一个直角三角形,当
时,
的值都是固定的,小明的猜想对吗?如果对,请利用图
进行证明,并用含
和
的式子表示
的值.
【解决问题】如图
,在菱形
中,
若
、
分别是边
、
上的动点,且
,作
,垂足分别为
、
,则
的值为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81750aafd6a0d3a6bcc2c74b4a4ff9f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.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/1369d71cf85a656152073e2aef91a837.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c82f3672863c70c3a46ff547120e731.png)
问题:若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06783a096c0d9581923a80d3375b9ca6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c82f3672863c70c3a46ff547120e731.png)
【操作探究】如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/860adaf4f564ff7520b8a143d1ed8fd3.png)
爱动脑筋的小明立即拿出另一个三角板进行了验证,发现果然和之前发现的结论一样,于是他猜想,对于任意一个直角三角形,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1369d71cf85a656152073e2aef91a837.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c82f3672863c70c3a46ff547120e731.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c82f3672863c70c3a46ff547120e731.png)
【解决问题】如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad85b4fd7df52029b829812ca72bc6dc.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/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29819c98ebd087116d5e579f4f088fe8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c7d3d0f67a0f0564162f659ab0fd3ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fee0b88f39b6ce9ada86f6549bc5928.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/1/94e61984-2af9-4ea4-afc1-d6543905e5a6.png?resizew=517)
您最近一年使用:0次
2023-06-28更新
|
274次组卷
|
2卷引用:2023年河南省郑州外国语中学中考三模数学试题
9 . 数学兴趣小组活动中,刘老师展示一个问题情境,供同学们探究:
问题情境:如图,
中,
,点P为斜边
上不与A,B重合的一个动点,过点P作
于点Q,分别过P,Q作
,
交
于点D,请讨论可能发现的结论.
以下是讨论过程:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/11/7725e80d-4e69-431e-9912-8b1f2aeff997.png?resizew=428)
请仔细阅读讨论过程,完成下述任务:
(1)小明推导四边形
是平行四边形的依据是 ,小亮推导四边形
是平行四边形的依据是 ,其中小亮得出
的依据是 (填序号);
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c0817de6f4d7c820304fbf9ef1c3fe0.png)
(2)当点D恰好落在
上时,请证明小红的结论;
(3)若
的中点为E,当点E恰好落在
一边的垂直平分线上时,直接写出此时
的长.
问题情境:如图,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6305fec0a56a185c9d77305989cc6b43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92b154270249b0ef54ddb26137b2681a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b81ca2053ee356f7171d1ad5906f4e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c118858379800688c993a8b61270b356.png)
以下是讨论过程:
小明:我发现四边形![]() 理由:由作图可知, ![]() ![]() 小亮:我和小明想法一样,但还可以用全等三角形来解决. 理由:∵ ![]() ![]() 又∵ ![]() ![]() ![]() ∴四边形 ![]() 小红:我发现如果点D恰好落在 ![]() ![]() |
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/11/7725e80d-4e69-431e-9912-8b1f2aeff997.png?resizew=428)
请仔细阅读讨论过程,完成下述任务:
(1)小明推导四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e5fbbca784b2edc6af96ce3b21451df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e5fbbca784b2edc6af96ce3b21451df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86e8079425f7984c1480af05c8c77f5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c0817de6f4d7c820304fbf9ef1c3fe0.png)
(2)当点D恰好落在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
您最近一年使用:0次
2023-03-06更新
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125次组卷
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2卷引用:河南省郑州市二中共同体2022-2023学年九年级上学期期末数学试题
名校
10 . 如图,一次函数
的图象与反比例函数
的图象交于点A,
,与x轴交于点
,点D在第三象限,且
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/16/834672ce-fc74-445d-a5fe-420ea51df12b.png?resizew=175)
(1)利用尺规作出点D(不写作法,保留作图痕迹);
(2)若
,求反比例函数与一次函数的解析式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c15fb18163df0690365a0d2e7ee88f5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05621b18b7ffc991d9f30380e2e08fea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e2c254a6b8c7d07a223af8bc1e045ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca0b4afd16b79370532de44989d6c43d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b757f0c42ae5c9a2d6a4b19e5877b27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fffc2a946e72f26a8af584d8ead3a396.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/16/834672ce-fc74-445d-a5fe-420ea51df12b.png?resizew=175)
(1)利用尺规作出点D(不写作法,保留作图痕迹);
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c6d938bb311b462ad16381bcf3b7e69.png)
您最近一年使用:0次
2023-02-08更新
|
214次组卷
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3卷引用:河南省郑州市航空港区外国语中学2022-2023学年九年级上学期数学期末试题