在
中,点E,F分别在边AB,CD上,且BE=DF,连接AF,CE.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/26/65c4d217-3b2c-4fbe-960f-06ecc94f9446.png?resizew=366)
(1)如图1,求证:∠BEC=∠DFA;
(2)如图2,连接BD分别交AF,CE于点G,H,连接AH,CG.
①求证:四边形AGCH是平行四边形;
②若AF⊥BD,∠ABC=45°,AB=17,AD=
,求GH的长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/26/65c4d217-3b2c-4fbe-960f-06ecc94f9446.png?resizew=366)
(1)如图1,求证:∠BEC=∠DFA;
(2)如图2,连接BD分别交AF,CE于点G,H,连接AH,CG.
①求证:四边形AGCH是平行四边形;
②若AF⊥BD,∠ABC=45°,AB=17,AD=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86391dc521a0d9de2a6e08ed04a9ac63.png)
21-22八年级下·四川成都·期末 查看更多[2]
更新时间:2022-08-22 21:10:12
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相似题推荐
解答题-问答题
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【推荐1】已知:在矩形
中,点
都在
上,且
,连接
.
(1)如图1,求证:
;
(2)如图2,连接
交
于点
,当
,且
时,在不添加任何辅助线的情况下,请直接写出图2中度数为
的角.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a373959bb9026f8a09845c0b828bf82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ff56ea00ca90825f3d95809de24f639.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ec07ca71c03f8c1d6d3a1e2efcdff02.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/7/47933c55-5ce2-44c4-8ff2-68d8c1d52fd0.png?resizew=303)
(1)如图1,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f805768a5ffaf8bdfa4bc3b680aafdc9.png)
(2)如图2,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8801c36839e729bd21391fa7ddfa058.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa934dccd11401e8872835f36e65396.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0605877358d2ae880063f7396420ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c0927afc571a7c966c98192040979e.png)
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【推荐2】长方形
位于平面直角坐标系中平行移动.
![](https://img.xkw.com/dksih/QBM/2020/12/1/2605025320779776/2606792147099648/STEM/2cb01e21-f454-44bc-ad2e-55258a51aae3.png)
(1)如图1,若
轴且点
的坐标
,点
的坐标为
,在边
上有动点
,过点
作直线
交
边于点
,并使得
.
①求长方形
的面积.
②在直线
上是否存在一点
,使得
是以
为直角边的等腰直角三角形?若存在,求出
点坐标:若不存在,请说明理由.
(2)如图2,若
轴且
、
关于
轴对称,连接
、
、
,且
平分
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/2020/12/1/2605025320779776/2606792147099648/STEM/2cb01e21-f454-44bc-ad2e-55258a51aae3.png)
(1)如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24624dffd30b66a5e4de57362b32b2a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20aa36cae34afaa391a4319c9c5eb87a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4065ed9c98391f4cfe89319b6e65b44f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.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/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e22b5c57bdbd27fda7f38db76ebcae46.png)
①求长方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
②在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/985b383be47791e0409e542225982299.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24624dffd30b66a5e4de57362b32b2a3.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/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76bc8e50eeccced1d7f3bc52e09a7d03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e1e516cd5a8cce0851d1ea38b54278a.png)
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【推荐1】如图,在平面直角坐标系中,直线
与x轴,y轴分别交于A,B两点,直线
与直线
相交于点C(m,4).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/7/c02cd761-2484-49e2-82b6-afc1010a8a3b.png?resizew=287)
(1)则点A的坐标为 ,m的值为 ;
(2)直线
与x轴交于点D,动点P从点D开始沿线段DA以每秒1个单位长度的速度向A点运动,设点P的运动时间为t秒.
①若
的面积为12,求t的值;
②是否存在某一时刻t,使
为等腰三角形?若存在,求出t的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c31c4f39399ec245a67db2933ed639f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c31c4f39399ec245a67db2933ed639f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee9de2ab436e867724089fd1db1910a8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/7/c02cd761-2484-49e2-82b6-afc1010a8a3b.png?resizew=287)
(1)则点A的坐标为 ,m的值为 ;
(2)直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee9de2ab436e867724089fd1db1910a8.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/147de24f071e316b68fd2e78e3c84545.png)
②是否存在某一时刻t,使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/147de24f071e316b68fd2e78e3c84545.png)
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【推荐2】如图,如正方形ABCD的边BC上有一点E,∠DAE的平分线交CD于点F,请问AE=DF+BE是否成立?请说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/14/0dfd62a1-a71b-4a3d-8687-7f6892301e05.png?resizew=108)
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【推荐3】已知△ABC和△ADE都是等腰直角三角形,且∠BAC=∠DAE=90°.
![](https://img.xkw.com/dksih/QBM/2020/1/15/2377708263301120/2378551323590656/STEM/93f308af8a494fcab5b1c8b09d6f5ead.png?resizew=623)
(1)如图①,点D、E分别在线段AB、AC上. 请直接写出线段BD和CE的位置关系: ;
(2)将图①中的△ADE绕点A逆时针旋转到如图②的位置时,(1)中的结论是否成立?若成立,请利用图②证明;若不成立,请说明理由;
(3)如图③,取BC的中点F,连接AF,当点D落在线段BC上时,发现AD恰好平分∠BAF,此时在线段AB上取一点H,使BH=2DF,连接HD,猜想线段HD与BC的位置关系并证明.
![](https://img.xkw.com/dksih/QBM/2020/1/15/2377708263301120/2378551323590656/STEM/93f308af8a494fcab5b1c8b09d6f5ead.png?resizew=623)
(1)如图①,点D、E分别在线段AB、AC上. 请直接写出线段BD和CE的位置关系: ;
(2)将图①中的△ADE绕点A逆时针旋转到如图②的位置时,(1)中的结论是否成立?若成立,请利用图②证明;若不成立,请说明理由;
(3)如图③,取BC的中点F,连接AF,当点D落在线段BC上时,发现AD恰好平分∠BAF,此时在线段AB上取一点H,使BH=2DF,连接HD,猜想线段HD与BC的位置关系并证明.
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【推荐1】如图,设四边形
是边长为1的正方形,以正方形
的对角线
为边作第二个正方形
,再以第二个正方形的对角线
为边作第三个正方形
,如此下去…
(1)记正方形
的边长为
,依上述方法所作的正方形的边长依次为
,
,求出
的值.
(2)根据以上规律写出第n个正方形的边长
的表达式.并求出
的值.
![](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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd4b93d7abcfc4c3df48f03aa969c17f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/344164942bd5946e83cbdf1ceb98c676.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/31/0a685b00-4a0d-4cbc-b159-e90e66a4c56c.png?resizew=205)
(1)记正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85657c19197a20a41d4c1d5f17ca3a59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5d7171905c935da184ff5c7697bc8dd.png)
(2)根据以上规律写出第n个正方形的边长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaec3004937aab88c44e66753caab782.png)
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【推荐2】如图,在一条笔直的东西方向的公路上有A、B两地,相距500米,且离公路不远处有一块山地C需要开发,已知C与A地的距离为300米,与B地的距离为400米,在施工过程中需要实施爆破,为了安全起见,爆破点C周围半径260米范围内不得进入.
(2)在进行爆破时, A、B两地之间的公路是否有危险需要暂时封锁?若需要封锁,请求出需要封锁的公路长.
(2)在进行爆破时, A、B两地之间的公路是否有危险需要暂时封锁?若需要封锁,请求出需要封锁的公路长.
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【推荐1】如图,在矩形
中,M,N分别是
,
的中点,P,Q分别是
,
的中点.
![](https://img.xkw.com/dksih/QBM/2021/1/5/2629562240352256/2629771698372608/STEM/bcc43e0ce47f4cb4b08b0a9baca2749a.png?resizew=190)
(1)求证:四边形
是平行四边形.
(2)猜想:四边形
是哪种特殊的平行四边形?并证明你的猜想.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3533837e3d08c461dea031a44e5424d.png)
![](https://img.xkw.com/dksih/QBM/2021/1/5/2629562240352256/2629771698372608/STEM/bcc43e0ce47f4cb4b08b0a9baca2749a.png?resizew=190)
(1)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49a796e9136e2e6e7ecbdc245c242018.png)
(2)猜想:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96198405db093eb43952282a69332f92.png)
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【推荐2】如图,平行四边形ABCD中,点
分别是
的中点,
交
于点O.
(1)证明:四边形DEBF是平行四边形;
(2)若
且
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/996e0cca9a581666631bcd32730d1fd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e12ccccbefac72daecbf78d92e0847b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
(1)证明:四边形DEBF是平行四边形;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43a6f36741b86f464be362b12bac13d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c4e4a162f12d12a082b8d8fdd1aeab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/299fe914d64f3a06f9b641d5591fc47a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/10/747fd967-fe7c-476a-8c41-5cf467e53ff7.png?resizew=177)
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