(1)问题发现
如图1,在
和
中,
,
,
,连接
,
交于点M.填空:
①
的值为__________;
②
的度数为__________.
(2)类比探究
如图2,在
和
中,
,
,连接
交
的延长线于点M.请判断
的值及
的度数,并说明理由.
如图1,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fe95f656b98b53f71a9d72bf0c9a4b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4807ca16360c0cca436e59d4be98f626.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fca3734de79f7f50b552ef62b29dc7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33cbad6599796efc1c177ae9349feda9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91953777ec8c072568713778730616b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d78c44f837a63101c19745cc1a79a740.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2f9c3b578fc0598d5ec6c79404c6cc2.png)
(2)类比探究
如图2,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fe95f656b98b53f71a9d72bf0c9a4b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4807ca16360c0cca436e59d4be98f626.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3d3c378b1118d331d30b63fc587b270.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/332084cfb20ebc7efa528abeb9c49e07.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/d78c44f837a63101c19745cc1a79a740.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2f9c3b578fc0598d5ec6c79404c6cc2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/1/b07bef29-7fa7-42cc-b54e-01be39e6df70.png?resizew=272)
22-23九年级上·河南郑州·期末 查看更多[3]
河南省郑州市金水区郑州龙门实验学校2022-2023学年九年级上学期期末数学试题(已下线)2023年河南省驻马店市八校联考中考二模数学试题变式题21-23题河南省郑州市登封市嵩阳中学2023-2024学年九年级上学期12月月考数学试题
更新时间:2023-01-27 13:08:36
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相似题推荐
解答题-证明题
|
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【推荐1】如图,BC为
直径,AB切
于B点,AC交
于D点,E为AB中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/5/6a4d52e2-2ff5-4d91-8a33-7e7aa421d378.png?resizew=185)
(1)求证:DE是
的切线;
(2)若
,
,求阴影部分的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/5/6a4d52e2-2ff5-4d91-8a33-7e7aa421d378.png?resizew=185)
(1)求证:DE是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3018c687427b6257767eda4a8c6612.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
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【推荐2】如图,在菱形
中,P是它对角线上面的一个点,连接
后并延长,交
于点E,交
的延长线于点F.
;
(2)如果
,
,求线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15422778dec72f46aeb0ab19eb49ae76.png)
(2)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d4fb1fe5859dd21a6efd4feae51a17e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec82d5207daadaefea6846b4036347a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
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【推荐3】问题呈现:证明命题:在直角三角形中,如果一个锐角等于30°,那么它所对的直角边等于斜边的一半.
已知:如图,在
中,
.
求证:
.
证明:如图,延长
至点D.使
,连接
.
(1)请根据提示,结合图形,写出完整的证明过程.
(2)结论运用:
①如图,小明在汽车上看见前面山顶上有一个气象站,此时测得水平线与视线的夹角为
,当汽车又笔直地向山的方向行驶4千米后,小明再看气象站,测得水平线与视线的夹角为
.那么这个气象站离地面的高度为______千米.
②如图,
为等边三角形,
相交于点P,
于点Q,
.求
的长.
已知:如图,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9de751eea06e785410d4d8fd3e78b96.png)
求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebe44ff9f829f6c034682572ad00e366.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/18/d8873ddb-9142-48d3-aa4e-aab547c03f45.png?resizew=318)
证明:如图,延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19a1bf64ba772922fe58b5322eb4bced.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(1)请根据提示,结合图形,写出完整的证明过程.
(2)结论运用:
①如图,小明在汽车上看见前面山顶上有一个气象站,此时测得水平线与视线的夹角为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76c12e76fbd84eeec721386bd3b04cc4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/18/3a01e4ec-2131-422d-8999-1dccf18de423.png?resizew=496)
②如图,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ee7b9ec287a477a0fc846af876be66c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a77f2b19c52a8ef7d6d0cbdc43da861d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a11d23afda422cd8af1214beb527780.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/18/9b0e8b26-8e8f-4087-9e69-9fde55189cfa.png?resizew=164)
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【推荐1】【探究】
已知,点
,
,
,
分别在四边形
的四条边上,且![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b6e1eb7a0bb8b88a7056bc2cf7a7fc0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/4/1d516bdd-5bf7-4c83-9cd9-c8d25d1b2fd1.png?resizew=460)
(1)如图
,若四边形
为正方形,
,则
______;
(2)如图
,若四边形
为矩形,
,
,求
的值.
(3)【拓展】
如图
,四边形
中,点
,
分别在
,
上,且
,若
,
,
,求
的值.
已知,点
![](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/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b6e1eb7a0bb8b88a7056bc2cf7a7fc0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/4/1d516bdd-5bf7-4c83-9cd9-c8d25d1b2fd1.png?resizew=460)
(1)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3319509bbd6b74f077bc88681d7be74d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d151cd24c2f9c320eb54e69d71e5cb46.png)
(2)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d42e97eee705d164e6ac6de9ecd6d1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4a88b719166fcc1431f876bc8c5656c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d12504c6da5f94ba2656ca727c2fe82.png)
(3)【拓展】
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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4e22ba3e6e1c1d6b12d9b8baa8d1f02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3bbe4cdd2c154bd9a8073b0d4cecb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/061080203fc853299a4704d2b9cd3a01.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb5a38c27c3111dfd51b49de5b2e27fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/266448067c16af49b5abf9dd2bff1a14.png)
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真题
【推荐2】已知Rt△ABC中,∠B=90°,AC=20,AB=10,P是边AC上一点(不包括端点A、C),过点P作PE⊥BC于点E,过点E作EF∥AC,交AB于点F.设PC=x,PE=y.
(1)求y与x的函数关系式;
(2)是否存在点P使△PEF是Rt△?若存在,求此时的x的值;若不存在,请说明理由.
(1)求y与x的函数关系式;
(2)是否存在点P使△PEF是Rt△?若存在,求此时的x的值;若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/2016/9/13/1574237524058112/1574237530324992/STEM/70df5d86125a47558fa7967263f9d374.png)
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适中
(0.65)
【推荐1】如图,在
中,
,
,
,动点
从点
出发,沿
以每秒
个单位长度的速度向终点
运动.以点
(点
不与点
重合)为中心,把射线
顺时针旋转
交射线
于点
.设点
的运动时间为
秒,
与
重叠部分图形的面积为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/22/017713e6-1f9c-4af0-a539-8ccf0fd702cf.png?resizew=182)
(1)填空:
__________;
(2)当点
与点
重合时,求
的值;
(3)求
关于
的函数解析式,并直接写出自变量
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3018c687427b6257767eda4a8c6612.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e1f4f255d191786f7d330d278868c2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](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/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e61620a272dada8d4b9a9fab6379dfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84288b493b64c3a30466fb9075621da4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9763846b1131e1e3e2d741ad95d5bb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/22/017713e6-1f9c-4af0-a539-8ccf0fd702cf.png?resizew=182)
(1)填空:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c26a46e7879436d532af3f4b6e258a81.png)
(2)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(3)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
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【推荐2】如图,如图,△ABC中,点O是边AB上任意一点,以O为圆心,OB为半径的圆交AC于E,交AB交于D,给出下列信息:①∠C=90°;②∠BDF=∠F;③AC是⊙O的切线;
(2)如果CF=1,sinA=
,求⊙O的半径.
(2)如果CF=1,sinA=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eac97e6740365c85ad857aff85cefbe5.png)
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