23-24九年级上·浙江·期末
1 . 综合实践,
问题背景:借助三角形的中位线可构造一组相似三角形,若将它们绕公共顶点旋转,对应顶点连线的长度存在特殊的数量关系,数学小组对此进行了研究.如图1,在
中,
,分别取
,
的中点D,E,作
.如图2所示,将
绕点A逆时针旋转,连接
,
.
旋转过程中,线段
和
的长度存在怎样的数量关系?写出你的猜想,并证明.
(2)性质应用
如图3,当
所在直线首次经过点B时,求
的长.
(3)延伸思考
如图4,在
中,
,分别取
,
的中点D,E.作
,将
绕点B逆时针旋转,连接
,
.当边
平分线段
时,求
的值.
问题背景:借助三角形的中位线可构造一组相似三角形,若将它们绕公共顶点旋转,对应顶点连线的长度存在特殊的数量关系,数学小组对此进行了研究.如图1,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c509c523e005eebfa5f60cb09766986c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3182db896bc2462331796e2a6108363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6b41d4070854edfaa24071137b314cb.png)
旋转过程中,线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3182db896bc2462331796e2a6108363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6b41d4070854edfaa24071137b314cb.png)
(2)性质应用
如图3,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a6c6e7c025362c46a64a8956761f08e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6b41d4070854edfaa24071137b314cb.png)
(3)延伸思考
如图4,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/981ff64a7bde2e45a97b9f089b6ff05d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f2281cb6df0c3c518ce5ed19a02b57e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f2281cb6df0c3c518ce5ed19a02b57e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6b41d4070854edfaa24071137b314cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a6c6e7c025362c46a64a8956761f08e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c7ed9f2339c28aee0b31b3d877e49cc.png)
您最近一年使用:0次
2024-03-09更新
|
334次组卷
|
4卷引用:【2024年】【初三】【期末】【拱墅区】【数学】【徐娴静收集】
(已下线)【2024年】【初三】【期末】【拱墅区】【数学】【徐娴静收集】2024年山东省济南市九年级学业水平考试数学模拟预测题2024年山东省聊城市莘县九年级下学期期中(一模)数学试题2024年山东省聊城市莘县九年级中考第一次模拟考试数学试题
2 . 如图,在矩形
中,点
在边
上,连接
,过点
作
于点
.若
,
,
,则
( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/1/3063b2f9-a57e-4b84-95d4-45cc53ef726d.png?resizew=114)
![](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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb91cb9a5a14169845d700fbd95890ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4630b9ca3d20635161fa8fbf812b9128.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ebb33adb2310a6e03918761e68204a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f341b98caabf99bc683ce8407068735e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f79997547fb75e88ad1e2c66989a4a0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/1/3063b2f9-a57e-4b84-95d4-45cc53ef726d.png?resizew=114)
A.15 | B.16 | C.![]() | D.![]() |
您最近一年使用:0次
3 . 如图1,,在
和
中,
,
,
,
,
,将
绕点A在平面内顺时针旋转![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
,连接
,
交
于点M,
交
于点N.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/9/f8fec083-30a8-453a-8c0a-74b4e89e4401.png?resizew=417)
(1)求证:
;
(2)请判断线段
和
的位置关系,并说明理由;
(3)当点B、D、E在同一条直线上时,求线段
的长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40e7ba6e267dde1a65a98f9f36b585ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26813466e2ee49a493881a4384fc8748.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10c013bbe1fb6e9acf461548b5cf6cd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21ea52361458ce2e49ed0fe99d8e6c02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6166b9a5437671bcba31e17c375eb39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4aca5534bce25acaeb7379deed8f8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63b43490ca09467a4c8cd8cfe91c94e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22d8e8ca9b631413f1d5a6ea3334d51f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53a08d81353a3ea431787f550b9d9b7b.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/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/9/f8fec083-30a8-453a-8c0a-74b4e89e4401.png?resizew=417)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a86d0e10bf96751840c1c1e0ea0aab9d.png)
(2)请判断线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
(3)当点B、D、E在同一条直线上时,求线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
您最近一年使用:0次
4 . 如图,
是正方形
边
上一个动点E(不与
重合),
是
延长线上一点,且
,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/27/23032604-4b34-4c9f-8534-d9eca4f4889a.png?resizew=254)
(1)求证:
为等腰直角三角形.
(2)过点
作
的垂线,与直线
分别交于
两点,记
交
于点
.
①当
,求线段
的长.
②设
的面积记作
的面积记作
,用含
的代数式表示
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab609a6574633ebabcff3e73fa862081.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f40b3bf6b27f936e0747de92151a1f77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc6c310fa3c3363a42fe869a70bcc080.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/27/23032604-4b34-4c9f-8534-d9eca4f4889a.png?resizew=254)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
(2)过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c877203215bd4cdc93dd0a6cb66f551.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c0f067a2a348ceb24a408f82992eab8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6f4b6633012ced30ccd116228cb9696.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e105760638b22b26ff8bec4354255e4c.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dfaaf3f7fd61a9414973c00bc3bafe3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
②设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d54a8424bf0ca8a6c23746b22f7e4be7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f944b0bbb4b208ab14d4cfd685ed723.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/235f0a6fb218d28383e6f27f2df1f50f.png)
您最近一年使用:0次
5 . 如图,在
中,
是
的角平分线,点
是边
上一点,且满足
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/27/5209aa56-8364-47b3-a036-f996b3718ac3.png?resizew=192)
(1)证明:
;
(2)若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/102e836344156ea835d7d4e9b4120fe8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/27/5209aa56-8364-47b3-a036-f996b3718ac3.png?resizew=192)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39be09e2acecabb5d37e7ff423d342f0.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d649afbddd907f0dfec1420f02f82fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/267ace52b64e1e7dfc5211e033255b7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
您最近一年使用:0次
6 . 如图1,在
中,
,
,点P是
内一个动点,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/29/6119a3fd-ce77-49d2-b5c0-b7487445ba78.png?resizew=487)
(1)试找出与
相等的角,并说明理由.
(2)如图2,连接
并延长交
的外接圆
于点Q,交
于点D,连接![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f53330c107f8245290a5a42c3d356acd.png)
①求证
;
②求
的最小值.
(3)在如图2的条件下,若
,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f89deb952f57f4b3fa4887b098b7b91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942a9a6bde4a5b9803b68b1e9065de62.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/29/6119a3fd-ce77-49d2-b5c0-b7487445ba78.png?resizew=487)
(1)试找出与
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/172766b458ea1e95ab1f5cd70bab7463.png)
(2)如图2,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4234cf4d8159f5df0333bcc269ffe099.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f53330c107f8245290a5a42c3d356acd.png)
①求证
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7d23d8614be566e6dd3a0c68ea15450.png)
②求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dac9bf5ac3d89d6847a585bf318b3ba8.png)
(3)在如图2的条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f6f95e7b64ef2c99935ca58e44df645.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/074b9214844a7c8a0bca3d97e8c7a244.png)
您最近一年使用:0次
7 . 如图,过菱形
的顶点D作直线,分别交
的延长线于点B,交
的延长线于点C.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/28/e7797b63-f17c-4943-89a4-f7b58344cd99.png?resizew=224)
(1)求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f911bb45beb472681302b182f01a1f6d.png)
(2)若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48a61d8bedef61745ee4fd89a8c0c119.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/28/e7797b63-f17c-4943-89a4-f7b58344cd99.png?resizew=224)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f911bb45beb472681302b182f01a1f6d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb5b12692517a39c320f99a479eb055.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
您最近一年使用:0次
8 . 如图,
内接于
,
,它的外角
的平分线交
于点D,连接
,
,
交
于点F.若
,
,
,则下列结论正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/4/86a0be18-8e62-4627-9687-4efb66f01e83.png?resizew=178)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cf82e97595128f030504932bd738e6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6344778ed1e75c1a99e2268468081867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d3cd8fbcd9eb594adb8367795d444d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/597ce705d3a2fe04d29de9e81ec6250d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93f9052064539cbdf04f5aba4a971f9a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/4/86a0be18-8e62-4627-9687-4efb66f01e83.png?resizew=178)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
9 . 如图,在矩形
中,
,点
在边
上,
于点
,若
,则
的长为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e0cdfb6d592897c6485ce1741677846.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/c672f693a7e75a7bae4936dcb1920430.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aeedb5f361a1baff6338436fff6c471d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/4/7a3608a7-e933-4212-b768-9f2452dd0a65.png?resizew=168)
A.6 | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
10 . 如图,在
中,
分别为
上的点
,
,则
的长为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/5/d181bd48-4e4a-4fcd-8721-6342b9351b6b.png?resizew=150)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3648c864f9f58da1dbb166fee84cfeaf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fa49835cb36d11ba406fa8cabbecd69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac1de4b839c9774f6f3ca27805638e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d649afbddd907f0dfec1420f02f82fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/5/d181bd48-4e4a-4fcd-8721-6342b9351b6b.png?resizew=150)
A.6 | B.5 | C.3 | D.2 |
您最近一年使用:0次