真题
名校
1 . 如图,
是
的内接正三角形,点
是圆心,点
,
分别在边
,
上,若
,则
的度数是____ 度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5623cef267f979a4373663573d2680fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cbee6d5731d6f4bb1e4f2ba3d89b7dc.png)
![](https://img.xkw.com/dksih/QBM/2020/7/16/2507335744274432/2507742466588672/STEM/31ff836b8c8446d781ca574ffbe91dce.png?resizew=129)
您最近一年使用:0次
2020-07-17更新
|
2985次组卷
|
23卷引用:贵州省安顺市2020年中考数学试题
贵州省安顺市2020年中考数学试题贵州省贵阳市2020中考试卷数学试题(已下线)考点17 圆-备战2021年中考数学考点河南省洛阳市2020-2021学年九年级上学期期末数学试题(已下线)考点32 圆的有关概念和性质—2021年《三步冲刺中考·数学》(全国通用)之第1步小题夯基础(已下线)第23讲 圆的有关性质 (讲练)-2021年中考数学一轮复习讲练测(已下线)必刷卷01-2021年中考数学考前信息必刷卷(广东专用)(已下线)考点14 等腰三角形与直角三角形的性质(考点)-备战2021年中考数学考点微专题(已下线)【万唯原创】2021年山西省面对面-练册第六章1(已下线)【万唯原创】2021年广东试题研究-练册-第六章1(已下线)【万唯原创】2021年河北面对面-第6章圆第2节(已下线)【万唯原创】2021年山西试题研究-练册-第六章1吉林省吉林市吉林十中2021-2022学年九年级上学期期末数学试题(已下线)专题24.6 垂直于弦的直径-垂径定理(培优篇)(专项练习)-2022-2023学年九年级数学上册基础知识专项讲练(人教版)贵州省遵义市赤水市第一中学2021-2022学年九年级上学期质检数学试卷(12月份)河南省安阳市飞翔中学2022-2023学年上学期第一次月考九年级数学试题2022年宁夏银川市第十五中学中考数学一模试题(已下线)第一次月考押题培优02卷(考试范围:1.1-2.6)-【微专题】2022-2023学年九年级数学上册常考点微专题提分精练(苏科版)(已下线)专题3.9 垂径定理(培优篇)(专项练习)-2022-2023学年九年级数学下册基础知识专项讲练(北师大版) 吉林省吉林市舒兰市2022-2023学年九年级上学期期末考试数学试题2022年广东省东莞市茶山镇中考一模数学试卷(已下线)专题2.55 圆(全章直通中考)(培优练)-2023-2024学年九年级数学上册基础知识专项突破讲与练(苏科版)(已下线)专题24.44 圆(全章直通中考)(培优练)-2023-2024学年九年级数学上册基础知识专项突破讲与练(人教版)
2 . 如图,在菱形ABCD中,∠ABC=120°,AB=4
,E为对角线AC上的动点(点E不与A,C重合),连接BE,将射线EB绕点E逆时针旋转120°后交射线AD于点F.
(1)如图1,当AE=AF时,求∠AEB的度数;
(2)如图2,分别过点B,F作EF,BE的平行线,且两直线相交于点G.
①试探究四边形BGFE的形状,并求出四边形BGFE的周长的最小值;
②连接AG,设CE=x,AG=y,请直接写出y与x之间满足的关系式,不必写出求解过程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
(1)如图1,当AE=AF时,求∠AEB的度数;
(2)如图2,分别过点B,F作EF,BE的平行线,且两直线相交于点G.
①试探究四边形BGFE的形状,并求出四边形BGFE的周长的最小值;
②连接AG,设CE=x,AG=y,请直接写出y与x之间满足的关系式,不必写出求解过程.
![](https://img.xkw.com/dksih/QBM/2020/7/15/2506413819863040/2507018165370880/STEM/5d349f5909dd495db153b62550d49e59.png?resizew=349)
您最近一年使用:0次
2020-07-16更新
|
437次组卷
|
2卷引用:四川省成都市武侯区2019-2020学年八年级下学期期末数学试题
3 . 在△ABC中,AB=AC,∠BAC=120°,以CA为边在∠ACB的另一侧作∠ACM=∠ACB,点D为射线BC上任意一点,在射线CM上截取CE=BD,连接AD、DE、AE.
(1)如图1,当点D落在线段BC的延长线上时,求∠ADE的度数;
(2)如图2,当点D落在线段BC(不含边界)上时,AC与DE交于点F,试问∠ADE的度数是否发生变化?如果不变化,请给出理由;如果变化了,请求出∠ADE的度数;
(3)在(2)的条件下,若AB=6,求CF的最大值.
(1)如图1,当点D落在线段BC的延长线上时,求∠ADE的度数;
(2)如图2,当点D落在线段BC(不含边界)上时,AC与DE交于点F,试问∠ADE的度数是否发生变化?如果不变化,请给出理由;如果变化了,请求出∠ADE的度数;
(3)在(2)的条件下,若AB=6,求CF的最大值.
![](https://img.xkw.com/dksih/QBM/2020/7/9/2502307438288896/2502850281070592/STEM/0ffc7ca457ae46f59e80dcda8c513b00.png?resizew=376)
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4 . 定义:如点M、N把线段AB分割成AM、MN、BN,若以AM、MN、BN,为边的三角形是一个直角三角形,则称点M、N是线段AB的勾股分割点.
![](https://img.xkw.com/dksih/QBM/2020/6/22/2490217899876352/2492513799528448/STEM/d3d8e508a7114de1a6bb67012106067f.png?resizew=655)
(1)如图2,已知点C、D是线段AB的勾股分割点,若AC=3,DB=4,求CD的长;
(2)如图3,在正方形ABCD中,∠MAM=45°,角的两边AM、AN分别交BD于E、F(不与端点重合),求证:E、F是BD的勾股分割点.
![](https://img.xkw.com/dksih/QBM/2020/6/22/2490217899876352/2492513799528448/STEM/d3d8e508a7114de1a6bb67012106067f.png?resizew=655)
(1)如图2,已知点C、D是线段AB的勾股分割点,若AC=3,DB=4,求CD的长;
(2)如图3,在正方形ABCD中,∠MAM=45°,角的两边AM、AN分别交BD于E、F(不与端点重合),求证:E、F是BD的勾股分割点.
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5 . 如图,△ABC是等边三角形,△ADC与△ABC关于直线AC对称,AE与CD垂直交BC的延长线于点E,∠EAF=45°,且AF与AB在AE的两侧,EF⊥AF.
(1)依题意补全图形.
(2)①在AE上找一点P,使点P到点B,点C的距离和最短;
(1)依题意补全图形.
(2)①在AE上找一点P,使点P到点B,点C的距离和最短;
②求证:点D到AF,EF的距离相等.
![](https://img.xkw.com/dksih/QBM/2020/6/20/2488491326734336/2492463358328832/STEM/a7f543df353344689d6e479d8033fa9c.png?resizew=160)
您最近一年使用:0次
解题方法
6 . 探究题:如图1,
和
均为等边三角形,点
在边
上,连接
.
![](https://img.xkw.com/dksih/QBM/2020/6/10/2481434061520896/2483948757721088/STEM/ce35189e9f0c4ed08079c1c085f109f5.png?resizew=148)
(1)请你解答以下问题:
①求
的度数;
②写出线段
,
,
之间数量关系,并说明理由.
(2)拓展探究:如图2,
和
均为等腰直角三角形,
,点
在边
上,连接
.请判断
的度数及线段
,
,
之间的数量关系,并说明理由.
![](https://img.xkw.com/dksih/QBM/2020/6/10/2481434061520896/2483948757721088/STEM/ed36df4e2e664435b59594dbe59be47e.png?resizew=175)
(3)解决问题:如图3,在四边形
中,
,
,
,
与
交于点
.若
恰好平分
,请直接写出线段
的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f460edcced5597615113c0fdc95b1dfc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://img.xkw.com/dksih/QBM/2020/6/10/2481434061520896/2483948757721088/STEM/ce35189e9f0c4ed08079c1c085f109f5.png?resizew=148)
(1)请你解答以下问题:
①求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86a2db6311e228ed33b6c71d0a5918cf.png)
②写出线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
(2)拓展探究:如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f460edcced5597615113c0fdc95b1dfc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26813466e2ee49a493881a4384fc8748.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86a2db6311e228ed33b6c71d0a5918cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://img.xkw.com/dksih/QBM/2020/6/10/2481434061520896/2483948757721088/STEM/ed36df4e2e664435b59594dbe59be47e.png?resizew=175)
(3)解决问题:如图3,在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23b6e08fde74010412a6f14ad4dfbcc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27db558e8db4c957654c8e5cecd2d2dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/037b342a682cbd4241855a243da3c016.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/727ad3e630a224303d6d3b8ad5c114ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/2020/6/10/2481434061520896/2483948757721088/STEM/fe2dc10f7c5c420fa19a267eaf80c0df.png?resizew=131)
您最近一年使用:0次
名校
7 . 如图,
和
中,
,
,
,边
与边
交于点
(不与点
,
重合),点
,
在
异侧,
为
的内心.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/8/a15a4055-2643-4b32-9a02-c4e53c00882c.png?resizew=343)
(1)求证:
;
(2)设
,用含
的式子表示
为___________,则求
的最大值为_______.
(3)当
时,
的取值范围为
,则
________,
________.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4362edfc026266c5d29b3f90df374e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5adc18ca424552b35ab939e9d57943e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/357d001bbcaffdd67399472fd3120ee8.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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e105760638b22b26ff8bec4354255e4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9524e3810e06dc781285f1289e75d653.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/8/a15a4055-2643-4b32-9a02-c4e53c00882c.png?resizew=343)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5cc2450dc300ce26b513c2abae28cab.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8711eddf26d11fc974dfb6da4b640918.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84494e057cb7bc129257c4cb962678ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce9e3c97a03095a8372d09f2ff6727cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a68a0037b50b07562417d47d1026723b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c57bbef89a37f1a3808c0ceeac0c22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3cb8d72bb2e281b943b3b430138ef7.png)
您最近一年使用:0次
解题方法
8 . 如图,四边形
,
均为菱形,
,连结
,
,
,
,若
,菱形
的周长为12,则菱形
的周长为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b1f13007c6d134c50004c62dc240707.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4e6f5241f614c7d310cbf3e25a6d615.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7eedfb7e187720b35504d90fc0b59ae5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c45cadfec8bd192111ad163a231314c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/255dd434c47872cfe5fee20179ae9e77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b1f13007c6d134c50004c62dc240707.png)
![](https://img.xkw.com/dksih/QBM/2020/5/19/2466152340668416/2466754052890624/STEM/64847675-c2f2-4701-8d35-e29d9787d715.png)
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2020-05-20更新
|
285次组卷
|
6卷引用:浙江省温州市三校2019-2020学年九年级下学期联考模拟数学试题
浙江省温州市三校2019-2020学年九年级下学期联考模拟数学试题(已下线)【新东方】【温州】【初三下】【数学】【00083】(已下线)专题24.5 构造直角三角形解题四大题型-2023-2024学年九年级数学上册举一反三系列(华东师大版)(已下线)专题23.3 构造直角三角形解题四大题型-2023-2024学年九年级数学上册举一反三系列(沪科版)(已下线)专题24.8 解直角三角形章末九大题型总结(拔尖篇)-2023-2024学年九年级数学上册举一反三系列(华东师大版)(已下线)专题23.6 解直角三角形章末九大题型总结(拔尖篇)-2023-2024学年九年级数学上册举一反三系列(沪科版)
解题方法
9 . (1)问题发现
如图1,
和
均为等边三角形,直线AD和直线BE交于点F.
填空:①
的度数是____;②线段AD,BE之间的数量关系为________;
(2)类比探究
如图2,
和
均为等腰直角三角形,
,直线AD和直线BE交于点F.请判断
的度数及线段AD,BE之间的数量关系,并说明理由,
(3)如图3,在
中,
,点D在AB边上,
,
,将
绕着点A在平面内旋转,请直接写出直线DE经过点B时,点C到直线DE的距离.
如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc4b17ce6e90cd3810a3696262e94c1e.png)
填空:①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36719f1e764ee0e719b65c49fae84677.png)
(2)类比探究
如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc4b17ce6e90cd3810a3696262e94c1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e47b22648879c0e9310a8f1db157ccbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36719f1e764ee0e719b65c49fae84677.png)
(3)如图3,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de0fc4483f35ead08cb2c18c2e10409c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68fbbd17c89f03dbb61cd6ffdb9a0344.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86338536656046e93b53672ade9a78b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f460edcced5597615113c0fdc95b1dfc.png)
您最近一年使用:0次
2020-05-10更新
|
194次组卷
|
8卷引用:【区级联考】河南省周口市川汇区2019届九年级上学期 期末数学试题
【区级联考】河南省周口市川汇区2019届九年级上学期 期末数学试题2019年河南省新野县九年级第二次中考模拟数学试题河南省洛阳市伊滨区2019-2020学年九年级第三次联考数学试题2020年河南省洛阳市伊滨区中考数学三模试题(已下线)【万唯原创】河南省中考数学-河南缺题-类比探究中(已下线)专题12 手拉手模型证相似-【微专题】2022-2023学年九年级数学下册常考点微专题提分精练(人教版)(已下线)专题17 手拉手旋转模型证相似-【微专题】2022-2023学年九年级数学下册常考点微专题提分精练(苏科版)2024年内蒙古自治区赤峰市松山区中考三模数学试题
10 . 如图1,在平面直角坐标系中,直线AB分别交y轴、x轴于点A(0,a),点B(b,0),且a、b满足a2-4a+4+
=0.
(1)求a,b的值;
(2)以AB为边作Rt△ABC,点C在直线AB的右侧,且∠ACB=45°,求点C的坐标;
(3)若(2)的点C在第四象限(如图2),AC与 x轴交于点D,BC与y轴交于点E,连接 DE,过点C作CF⊥BC交x轴于点F.
①求证:CF=
BC;
②直接写出点C到DE的距离.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/7/36e18f5c-0f6f-4d47-a18b-1ce6fd8dcc08.png?resizew=191)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c1a6d64155295cf6ecf34da4514c60.png)
(1)求a,b的值;
(2)以AB为边作Rt△ABC,点C在直线AB的右侧,且∠ACB=45°,求点C的坐标;
(3)若(2)的点C在第四象限(如图2),AC与 x轴交于点D,BC与y轴交于点E,连接 DE,过点C作CF⊥BC交x轴于点F.
①求证:CF=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
②直接写出点C到DE的距离.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/7/36e18f5c-0f6f-4d47-a18b-1ce6fd8dcc08.png?resizew=191)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/7/e2659584-11eb-4420-ab0b-beb554bae5cd.png?resizew=180)
您最近一年使用:0次
2020-04-12更新
|
640次组卷
|
8卷引用:湖北省十堰市丹江口市2019-2020学年八年级上学期期末数学试题