如图所示,矩形
中,以对角线
为边,作等腰
(点E在
上方),
且
,连接
.
______
;②求证:
;
(2)若
,
,连接
,请直接写出
的长______.
![](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/b5ce497569436aa4db106121018162ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98de02d1d5b7ac04bce54be393218922.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d888e40f68fe8a24d5dc9c749024808.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e7cbe31f9c11d236c7c9611f207f465.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ce4e0ef58ee96122cfd8a2260debef6.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78c1e75eb744576c32eed3f9d20f9558.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
22-23八年级下·湖北武汉·期中 查看更多[2]
湖北省武汉市江岸区2022-2023学年八年级下学期期中数学试题(已下线)八年级下学期期中模拟03(人教版:二次根式、勾股定理、平行四边形)-2023-2024学年八年级数学下学期期中考点大串讲(人教版)
更新时间:2023-04-22 17:27:18
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解答题-证明题
|
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【推荐1】(1)如图,在△ABC中,∠ABC、∠ACB的平分线相交于F,过F作DE∥BC,分别交AB、AC于点D、E.判断DE=DB+EC是否成立?为什么?
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/11/9f8d907e-9f4a-4cca-8464-d8c5148337ac.png?resizew=222)
(2)如图,若点F是∠ABC的平分线和外角∠ACG的平分线的交点,其他条件不变,请猜想线段DE、DB、EC之间有何数量关系?
证明你的猜想.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/11/9f8d907e-9f4a-4cca-8464-d8c5148337ac.png?resizew=222)
(2)如图,若点F是∠ABC的平分线和外角∠ACG的平分线的交点,其他条件不变,请猜想线段DE、DB、EC之间有何数量关系?
证明你的猜想.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/11/474b8977-7c86-4468-9abc-bb32c9a8ea49.png?resizew=248)
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解答题-证明题
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【推荐2】如图,在平行四边形
中,
是对角线
的中点,过点
作
交
于点
.过点
作
交
、
于点
、
.
(1)如图1,若
,求平行四边形
的面积;
(2)如图2,若
,试探究
,
,
之间的数量关系,并证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/890c4bcc71c6ba24301e364c29a6a05a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eaa106172cc7b3db22ebbcbc1fe84c04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/17/32363ad7-a655-4d30-ae43-8000b3e062b2.png?resizew=393)
(1)如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f8e63d9b2e7e2172a0d5c776ba12db9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b27e47690ed332c573186992b6d25654.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecff6005f926665a926c07ad62e0f032.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
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解答题-证明题
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【推荐1】如图,AB为
的直径,C为BA延长线上一点,CD是
的切线,D为切点,
于点E,交CD于点F.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/17/ad0d3810-3188-48f6-b8b8-571c477bf0ed.png?resizew=153)
(1)求证:
;
(2)若
,
,求EF的长.
![](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/e1a7e903ececa6613f4585a3fe60145a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/17/ad0d3810-3188-48f6-b8b8-571c477bf0ed.png?resizew=153)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcbb94ec54a78f6789ef4fbd242e01e4.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5d10facd9dc1106f5b0d7a5ccf7d0b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7edbbab119e1b312eb4b09d383a4410a.png)
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名校
【推荐2】如图,AB是⊙O的直径,BC交⊙O于点D,弦AE交BC于点F,
=
,∠ACB=2∠EAB.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/13/737ed013-e556-4549-9055-206afd96db13.png?resizew=135)
(1)求证:AC是⊙O的切线;
(2)若cosB=
,AB=5,则线段BF的长为 .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0c44512cb86bcf48c6d21357f45b533.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df3e8eb4a512086ac8bff792878a527c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/13/737ed013-e556-4549-9055-206afd96db13.png?resizew=135)
(1)求证:AC是⊙O的切线;
(2)若cosB=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7294f5ae2a24ff42e84cd9773b2a7287.png)
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解答题-计算题
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真题
名校
【推荐1】如图,某学习小组在教学楼
的顶部观测信号塔
底部的俯角为30°,信号塔顶部的仰角为45°.已知教学楼
的高度为20m,求信号塔的高度(计算结果保留根号).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/22/67b0ac36-6291-4138-93f4-e29fd9839b19.png?resizew=155)
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【推荐2】如图,在建筑物
的左边有一个小山坡,坡底
、
同建筑底端
在同一水平线上,斜坡
的坡比为
,小李从斜坡底端
沿斜坡走了26米到达坡顶
处,在坡顶
处看建筑物的顶端D的仰角
为35°,然后小李沿斜坡
走了
米到达底部
点,已知建筑物上有一点
,在
处看建筑物
点的仰角
为18°,(点
、
、
、
、
、
在同一平面内)建筑物顶端
到
的距离
长度为28.8米,(参考数据:
,
,
,
)
![](https://img.xkw.com/dksih/QBM/2021/10/4/2822095328141312/2824932023402496/STEM/a6769b72-e3e3-493c-9ae6-c58e5032cce9.png)
(1)求小李从斜坡
走到
处高度上升了多少米.
(2)求建筑物
的高度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4dd80daefa23a61d300a829f77bbfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2337efee1b691faaf98e9f0f60ae74d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.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/8455657dde27aabe6adb7b188e031c11.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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6e77eb78ed513a48e448bf393e762a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f28f6b6d156ea5306af55cdb662abe68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/412ed956e8f1ebf3ea4972e6477e2d77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/319c71c519f098eb26c88be0b832df81.png)
![](https://img.xkw.com/dksih/QBM/2021/10/4/2822095328141312/2824932023402496/STEM/a6769b72-e3e3-493c-9ae6-c58e5032cce9.png)
(1)求小李从斜坡
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(2)求建筑物
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
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【推荐1】如图,在正方形ABCD中,点E、F分别在边BC和CD上,且BE=CF,连接AE、BF,其相交于点G,将△BCF沿BF翻折得到△BC′F,延长FC′交BA延长线于点H.
(1)①求证:AE=BF;
②猜想AE与BF的位置关系,并证明你的结论;
(2)若AB=3,EC=2BE,求BH的长.
(1)①求证:AE=BF;
②猜想AE与BF的位置关系,并证明你的结论;
(2)若AB=3,EC=2BE,求BH的长.
![](https://img.xkw.com/dksih/QBM/2019/7/10/2243847334461440/2244508118097920/STEM/8c6c5eaf932f4330b5f26e73a4a9f0c7.png?resizew=128)
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解答题-问答题
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【推荐2】已知:如图,O正方形ABCD的中心,BE平分∠DBC,交DC于点E,延长BC到点F,使CF=CE,连结DF,交BE的延长线于点G,连结OG.
![](https://img.xkw.com/dksih/QBM/2011/11/10/1573276759572480/1573276783714304/STEM/c1fee08453df41419b60348795afa110.png?resizew=137)
(1)说明:△BCE≌△DCF;
(2)OG与BF有什么数量关系?说明你的结论;
(3)若BC·BD=
,求正方形ABCD的面积.
![](https://img.xkw.com/dksih/QBM/2011/11/10/1573276759572480/1573276783714304/STEM/c1fee08453df41419b60348795afa110.png?resizew=137)
(1)说明:△BCE≌△DCF;
(2)OG与BF有什么数量关系?说明你的结论;
(3)若BC·BD=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95bacae35b6e16a0a33c2bdc6bc07df7.png)
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