1 . 【课本再现】“直角三角形斜边上的中线等于斜边的一半”是直角三角形的一条重要性质定理.如图1,在
中,
,点D是
的中点.求证:
.
下面是两位同学两种添加辅助线的方法:
小明:如图2,延长
至点E,使
,连接
;
小华:如图3,取
的中点E,连接
;
(1)请你选择其中一位同学的方法完成证明,聪明的你也可以利用图1用其他方法完成证明.
中,
是高,求证:B,C,D,E四点共圆.
【拓展提升】(3)如图5,在五边形
中,
,
,F为
的中点,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c71622531dfa894f21b2da123d020d24.png)
下面是两位同学两种添加辅助线的方法:
小明:如图2,延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0fa1aa5a7a5bb172ed4603f17c8b2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bba87bb6ab3a88f6d9529e01ce585a5d.png)
小华:如图3,取
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
(1)请你选择其中一位同学的方法完成证明,聪明的你也可以利用图1用其他方法完成证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/692c58a2af64d705cd4a988ed2bfbc3d.png)
【拓展提升】(3)如图5,在五边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9142a8490de14a87eda628ffa7e28982.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/766ae8acaddb28f8a5a55eff086fd976.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd34a9d150aff3aa789230d7772384a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/193ea44749f1c64c8723e84a57d15cb9.png)
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2 . 【课本再现】
三角形的中位线定理:三角形的中位线平行于三角形的第三边,并且等于第三边的一半.
如图1,在
中,D,E分别是边
的中点.求证:
且
.
以下是小贤的证明思路:如图2延长
到点F,使
,连接
.
(1)请你根据小贤添加的辅助线,写出完整的证明步骤.
【知识应用】
(2)如图3,在四边形
中,E,F,G,H分别为各边中点.求证:四边形
是平行四边形.
(3)如图4,在四边形
中,对角线
与
相交于点H,E,F分别为边
的中点,连接
,分别交
于点M,N,且
.求证:
.
三角形的中位线定理:三角形的中位线平行于三角形的第三边,并且等于第三边的一半.
如图1,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5dc62e10004e73908091338362917da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c436f108fd4921dae15ecff19270237e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/950e82a0f9712457f2dd9f8a93f8a217.png)
以下是小贤的证明思路:如图2延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9a9618018d717926540d1452f76e44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09004de78fd10368a976cebf709355fb.png)
(1)请你根据小贤添加的辅助线,写出完整的证明步骤.
【知识应用】
(2)如图3,在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
(3)如图4,在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/f9b79c80cc81b5446dfac3ee97b03c03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a81be7fd9af59fef27fcf46aebb86b92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9d85036bd851e7b3c60a4c85f8fd8e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01476dfb5970e27f54f742c27b9515f9.png)
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3 . 综合与实践
问题提出
如图
,在四边形
中,
,
,
,
分别是
,
,
,
的中点,求证:四边形
是平行四边形.
探究展示
某学习小组的解题思路如图
:
反思交流
(1)上述解题思路中的“依据
”、“依据
”分别是什么?
依据
:______ ;
依据
:______ .
(2)若四边形
满足“
”的条件,试判断四边形
的形状,并说明理由.
(3)要使四边形
为矩形,则四边形
需满足的条件是:______ .
拓展思考
(4)如图
,
和
都是等腰直角三角形,
,点
,
分别是
,
的中点,连接
,
.请用等式表示
与
的数量关系,并证明.
问题提出
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/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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/20/6b98e52a-f357-494b-ab24-f2ff1214a809.png?resizew=690)
探究展示
某学习小组的解题思路如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
反思交流
(1)上述解题思路中的“依据
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
依据
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
依据
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
(2)若四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8d2530e7023b2345c651e8f53629ff1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
(3)要使四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
拓展思考
(4)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc3322a2ad9a95bdc9fc576a7a158d4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63b43490ca09467a4c8cd8cfe91c94e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26813466e2ee49a493881a4384fc8748.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.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/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
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2023-08-12更新
|
198次组卷
|
2卷引用:江西省赣州市经开区2022-2023学年八年级下学期期末数学试题
4 . 我们定义:若E,F,G,H分别是四边形
各边的中点,且四边形
是矩形,则四边形
是四边形
的中矩四边形.
(1)如图1,四边形
是菱形,E,F,G,H分别是四边形
各边的中点,求证;四边形
是四边形
的中矩四边形.
(2)如图2,以锐角
的两边
,
为边,在
外作等腰
和等腰
,其中
,F,G,H,M分别为
,
,
,
的中点.
①求证:四边形
是四边形
的中矩四边形.
②若四边形
的面积为8,
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(1)如图1,四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/20/733a3138-4025-47c4-8a49-6a4db998ccf1.jpg?resizew=128)
(2)如图2,以锐角
![](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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96e30a35fde57e0fee792f76b81d345a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5ce497569436aa4db106121018162ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa6dbdad29420bfbac0731f0fa4f7cb6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.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/editorImg/2023/6/20/a19df36e-555e-4ef5-a38d-14c5392bf59b.jpg?resizew=182)
①求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e90a571446744299e6325fd2892743b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65c42bce098904b241986bb91c65ab33.png)
②若四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e90a571446744299e6325fd2892743b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c42ed2e5bd5a0f033e24008697bf4963.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a01cd23196440c8e056fb81ea9379d4.png)
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5 . (1)计算:
.
(2)如图,在
中,D,E分别是
,
的中点,连接
并延长至点F,延长BC至点G,使得
,连接
.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e056e3f333fd88c771edc1ae77262e6e.png)
(2)如图,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/baedb038db26d9c599cdd2414695d772.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/feb2f646f44a4e93cd5959b598eb57df.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/20/524ccc17-5207-486f-8b4f-779850c7180b.png?resizew=166)
您最近一年使用:0次
2023-06-14更新
|
46次组卷
|
2卷引用:江西省上饶市余干县2022—2023学年八年级下学期第七次月考数学试题
6 . 如图,点D、E、F分别为
的边
、
、
的中点,连接
、
、
、
,
与
相交于点O,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.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/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0866e1551b61074ca8e61261ecd1f9dc.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/19/0f82d7a5-1995-432a-bdde-a37b929977c1.png?resizew=190)
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2023-06-08更新
|
94次组卷
|
4卷引用:江西省九江市永修县第三中学2023-2024学年九年级上学期月考数学试题
7 . 如图1所示:在
中,点D、E分别是AB,AC的中点,
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/12/55299c81-b1ee-4029-85d2-a15c50b008d1.png?resizew=490)
(1)直接写出DE与BC之间的关系:________________.理由:____________________________.
(2)如图2,点D、E、F分别是三边中点,图中有______个平行四边形,求证:
;
(3)如图3,点P、Q、R、S分别是四边形ABCD的中点,问题1,图中是否有平行四边形,有请指出并证明你所指出的四边形是平行四边形.问题2、猜想四边形ABCD和四边形PQRS之间的面积关系.并证明你的猜想.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/12/55299c81-b1ee-4029-85d2-a15c50b008d1.png?resizew=490)
(1)直接写出DE与BC之间的关系:________________.理由:____________________________.
(2)如图2,点D、E、F分别是三边中点,图中有______个平行四边形,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c633c39cf371885a55de0cfe47401d13.png)
(3)如图3,点P、Q、R、S分别是四边形ABCD的中点,问题1,图中是否有平行四边形,有请指出并证明你所指出的四边形是平行四边形.问题2、猜想四边形ABCD和四边形PQRS之间的面积关系.并证明你的猜想.
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8 . 如图正方形ABCD的边长为4,E、F、G、H分别是各边中点,连结EF、GH,把正方形分割成四个小正方形,EF、GH交于O点,I、K点分别是EB、OF的中点,∠HIJ=90°,IJ交EG于J,连结JK、HK.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/25/a6b73b0d-8453-45bc-9371-e4227c245fcf.png?resizew=178)
(1)点J处于EG什么位置?线段IJ与IH的长度关系如何?试证明你的结论.
(2)求四边形HIJK的面积.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/25/a6b73b0d-8453-45bc-9371-e4227c245fcf.png?resizew=178)
(1)点J处于EG什么位置?线段IJ与IH的长度关系如何?试证明你的结论.
(2)求四边形HIJK的面积.
您最近一年使用:0次
9 . (1)【母题呈现】如图1,
是
的中位线,以
为斜边作
,
,求证:
.
(2)【母题变式】如图2,
是
的中位线,分别以
为斜边作
和
,
,作
交
的延长线于点H,
与
交于点O.
①求证:
;②求
的度数.
(3)【拓展应用】如图3,在
中,分别以
为斜边作
和
,
,点P是线段
上一点,且
,连接
,请写出
与
之间的一个等量关系,并证明.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/16/46838caf-c89f-4f98-b798-fe847d50ce6f.png?resizew=205)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/16/a808682d-6233-4458-bd47-9d8f2f58213b.png?resizew=275)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](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/c49dad8ae6258676921827b51938ac71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ef15c28cb324a018a8575133f403506.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74e46fb91464159b80eab7c28a926b4e.png)
(2)【母题变式】如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0d54431bbb28ebd98db5c1dc6083a75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/856a695ccd2cf07a44ffee6ccfa04cd1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ea47cd8b50c17ed88e8d80dae8435be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3c785a70a027d0684973e9718015cb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/790db8e233280bec605fb7b6c3dfb873.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7e4fa04825ac7d071968056322d88be.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dc4091397c194c7f9244298867b6a19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56dcd6bc050c5609fa70e9e41122d233.png)
(3)【拓展应用】如图3,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0d54431bbb28ebd98db5c1dc6083a75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/856a695ccd2cf07a44ffee6ccfa04cd1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ea47cd8b50c17ed88e8d80dae8435be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3c785a70a027d0684973e9718015cb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/734a2e7b2e112c0d849169dc8ad3cd0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42387f096d74b2d9eeb20b0bfab3186.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb26d84907c923278ac4626a9d58947.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4505508b3e36db64a207dcdaf8eb22dc.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/16/46838caf-c89f-4f98-b798-fe847d50ce6f.png?resizew=205)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/16/a808682d-6233-4458-bd47-9d8f2f58213b.png?resizew=275)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/16/ab2111a3-dc18-4e68-89f4-e37407dcf02a.png?resizew=238)
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2022-07-09更新
|
223次组卷
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2卷引用:江西省景德镇市乐平市2021-2022学年八年级下学期期末数学试题
真题
名校
10 . 综合与实践
数学是以数量关系和空间形式为主要研究对象的科学.数学实践活动有利于我们在图形运动变化的过程中去发现其中的位置关系和数量关系,让我们在学习与探索中发现数学的美,体会数学实践活动带给我们的乐趣.
如图①,在矩形ABCD中,点E、F、G分别为边BC、AB、AD的中点,连接EF、DF,H为DF的中点,连接GH.将△BEF绕点B旋转,线段DF、GH和CE的位置和长度也随之变化.当△BEF绕点B顺时针旋转90°时,请解决下列问题:
(2)图③中,AB=2,BC=3,则
;
(3)当AB=m , BC=n时.
.
(4)在(2)的条件下,连接图③中矩形的对角线AC,并沿对角线AC剪开,得△ABC(如图④).点M、N分别在AC、BC上,连接MN,将△CMN沿 MN翻折,使点C的对应点P落在AB的延长线上,若PM平分∠APN,则CM长为 .
数学是以数量关系和空间形式为主要研究对象的科学.数学实践活动有利于我们在图形运动变化的过程中去发现其中的位置关系和数量关系,让我们在学习与探索中发现数学的美,体会数学实践活动带给我们的乐趣.
如图①,在矩形ABCD中,点E、F、G分别为边BC、AB、AD的中点,连接EF、DF,H为DF的中点,连接GH.将△BEF绕点B旋转,线段DF、GH和CE的位置和长度也随之变化.当△BEF绕点B顺时针旋转90°时,请解决下列问题:
(2)图③中,AB=2,BC=3,则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24d3913865c22e150166d463fcbd97dc.png)
(3)当AB=m , BC=n时.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24d3913865c22e150166d463fcbd97dc.png)
(4)在(2)的条件下,连接图③中矩形的对角线AC,并沿对角线AC剪开,得△ABC(如图④).点M、N分别在AC、BC上,连接MN,将△CMN沿 MN翻折,使点C的对应点P落在AB的延长线上,若PM平分∠APN,则CM长为 .
您最近一年使用:0次
2022-06-28更新
|
1484次组卷
|
12卷引用:2023年江西省萍乡市中考二模数学试题
2023年江西省萍乡市中考二模数学试题(已下线)2023年江西二模(几何综合)江西省吉安市吉安八校联盟2023-2024学年九年级下学期期中数学试题2022年黑龙江省齐齐哈尔市中考数学真题(已下线)专题13 相似三角形-2022年中考数学真题分项汇编(全国通用)(第2期)广东省深圳市华中师范大学龙岗附属中学(集团)2022-2023学年九年级上学期期中考试数学试卷(已下线)第五节 图形的旋转与位似03综合测河南省周口市淮阳区冯塘乡中学2022-2023学年九年级下学期3月月考数学试题广东省深圳市深圳实验学校初中部2022-2023学年九年级上学期月考数学试题2024年辽宁省初中学业水平模拟考试数学模拟预测试题2023学年吉林省长春市九年级下学期数学综合模拟预测题2024年河南省三门峡市九年级中考二模数学试题