如图1,已知
平分
,
平分
,且![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9431abc6d126074531bc93f8e9e75726.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/26/6528245b-8007-4c5e-a9c8-63180993f245.png?resizew=465)
(1)求证:
;
(2)如图2,若
,
,试求
的值;
(3)如图3,若
是直线
上一动点(不与
重合),
平分
,则
与
的数量关系为______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/246a86f34603eaf2e6a948681b831b0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a72dfbf0138a611174c36ce077e0c47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9431abc6d126074531bc93f8e9e75726.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/26/6528245b-8007-4c5e-a9c8-63180993f245.png?resizew=465)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b15e8aab02d3b5569d7b085140617c95.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f4f9da40e13f417b98a1568489b8c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25cfe42d61984376ab4aaad1a3ce71f4.png)
(3)如图3,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9020059d62af7498039f091de6f005ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48689c8d5e36b00d476dcfd2ac3d6024.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ede276ae986f4467fbb1e9cc60d2a7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84c38ffc474f45993a7ed1e3cd5da75a.png)
更新时间:2022-08-21 13:01:29
|
相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】如图,四边形
是正方形,M是
边上的一点,E是
的中点,
平分
.
与
的数量关系,并说明理由;
(2)求证:
;
(3)若
,求
的长.
![](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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e385b42f17d8d22605e6fb2b6c51895.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2f9c3b578fc0598d5ec6c79404c6cc2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87a78990f59de17e1327c0b6751e425b.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a3ba528adff5d4f3a26a03df3eaecce.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04ee826937d2add7a93aaa1422f8b736.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
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【推荐2】已知
,过点O作
.
(1)若
,求
的度数;
(2)已知射线
平分
,射线
平分
.
①若
,求
的度数;
②若
,则
的度数为 (直接填写用含
的式子表示的结果).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb7e00f8bacce4d649b535449f04568c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dc220e327187d0f787547e517f4ade.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/894706f45d576906aca6acaea15634ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fed1f57a835af4e9022e27603d12d31.png)
(2)已知射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fed1f57a835af4e9022e27603d12d31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d22df2977de56cc69be0c1e847653d7a.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e594be0b102ddddcc68282aef5d2901f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b2557547eecdc826b8282058802d217.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f2a01d8f8fe7a5fd1c080d14c050d5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b2557547eecdc826b8282058802d217.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
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解答题-问答题
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名校
【推荐1】在本学期的数学学习中,老师提出了这样一个问题:
如图1,在
中,
,D是
的中点,求
边上的中线
的取值范围.
【阅读理解】
小明在班内经过合作交流,得到了如下的解决方法:
(1)如图1,延长
到M,使
,连接
,根据______可以判定
,得出
,这样就能把线段
、
、
集中在
中,利用三角形三边的关系,即可得出中线
的取值范围.
【方法感悟】
我们发现,几何图形中出现能表示相等数量关系的条件时,如:“中点”、“角平分线”等,往往可以考虑做“辅助线”,构造全等三角形,从而达到解决问题的目的.
【问题解决】
(2)如图2,在
中,
,
的平分线
交
边于点D,若
,求
的长.
【应用提升】
(3)已知:如图3,
中,
.D、E是三角形边
、
上两个动点,且
,连接
,求
的最小值.
如图1,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a70f9dc8d3ff12d3dbe9cc3ad3ebc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
【阅读理解】
小明在班内经过合作交流,得到了如下的解决方法:
(1)如图1,延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65bc379448d8e65b05d099d6767c38fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8454c9cb0bc6f224d265a1736a26dda.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a55f65505ee61d463bfae41fcb8885a.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/e97392ff60fac8a261c6eab71bba028b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a5e0a51c9e14fb246b0ba0b231c1e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
【方法感悟】
我们发现,几何图形中出现能表示相等数量关系的条件时,如:“中点”、“角平分线”等,往往可以考虑做“辅助线”,构造全等三角形,从而达到解决问题的目的.
【问题解决】
(2)如图2,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88dc4d22c2c289f6d4494b9c2be84407.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.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/e8d10aec656cc67c4abc6040fbc37736.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
【应用提升】
(3)已知:如图3,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9dbb8d666c93eca7c40643389d063dca.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/d42218a68301d770accaaefb96b19f8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99a1465fd3835e3907212e120665656c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f01ab9c387fed24015e017f0df1c223a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/8/b2a90b73-6b72-443b-adbe-dda9f9855293.png?resizew=362)
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【推荐2】已知:直线
分别交直线
,
于点
,
,且
.
;
(2)如图2,点
,
分别在射线
,
上,点
,
分别在射线
,
上,连接
,
,且
,分别延长
,
交于点
,试判断
和
的位置关系,请说明理由;
(3)如图3,在(2)的条件下,连接
,
平分
,且
平分
,若
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.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/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6ff3d44da99d5841025133bada10e48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a11029ca6b4b9e7f777af0280cf163c.png)
(2)如图2,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91f3956f008cc29ca4bae44a087d5427.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53b95463a97c60db3250cb641bf6523d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d9b798a71ae94839e1ebb0a644202e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e0ae50d5993a332b5cddb022eaa6f1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/438f34bc8b04e8c494b91306ac6fe352.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3171b3d11c6f4619e189677345357508.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca4eaa7bad3cd00418e95aa2c78ae7f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/438f34bc8b04e8c494b91306ac6fe352.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3171b3d11c6f4619e189677345357508.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3834d7ec7531f3c3c0ce9b286f7a49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30f954a8da05cc9144d4bf86f88e236a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fb949f2a7ee89566c5c02b75043f6a3.png)
(3)如图3,在(2)的条件下,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa7a8f1bb76ce6165559a590f88b2787.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa7a8f1bb76ce6165559a590f88b2787.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74e5014645768575aac2578f228f8401.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a16f5621716bfef7a056a3f2712feb4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb34a7abb4b6269fbbec581df20dd3c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ec75d1304db20b8b6f8f0dade9f2b83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9015272ea1b7d9179bf3a1f5e3bd089.png)
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【推荐3】阅读第(1)题解答过程填理由,并解答第(2)题
(1)已知:如图1,AB∥CD,P为AB,CD之间一点,求∠B+∠C+∠BPC的大小.
解:过点P作PM∥AB
∵AB∥CD(已知)
∴PM∥CD ,
∴∠B+∠1=180°, .
∴∠C+∠2=180°
∵∠BPC=∠1+∠2
∴∠B+∠C+∠BPC=360°
(2)我们生活中经常接触小刀,如图2小刀刀柄外形是一个直角梯形挖去一个小半圈,其中AF∥EG,∠AEG=90°,刀片上、下是平行的(AB∥CD),转动刀片时会形成∠1和∠2,那么∠1+∠2的大小是否会随刀片的转动面改变,如不改变,求出其大小;如改变,请说明理由.
(1)已知:如图1,AB∥CD,P为AB,CD之间一点,求∠B+∠C+∠BPC的大小.
解:过点P作PM∥AB
∵AB∥CD(已知)
∴PM∥CD ,
∴∠B+∠1=180°, .
∴∠C+∠2=180°
∵∠BPC=∠1+∠2
∴∠B+∠C+∠BPC=360°
(2)我们生活中经常接触小刀,如图2小刀刀柄外形是一个直角梯形挖去一个小半圈,其中AF∥EG,∠AEG=90°,刀片上、下是平行的(AB∥CD),转动刀片时会形成∠1和∠2,那么∠1+∠2的大小是否会随刀片的转动面改变,如不改变,求出其大小;如改变,请说明理由.
![](https://img.xkw.com/dksih/QBM/2020/4/27/2450270147878912/2451048484700160/STEM/256e49631e034f86af26cc7238b03d03.png?resizew=424)
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【推荐1】已知
,点P在直线
之间,连接
.
如图1,过P作
,∴
______
(______)
∵
(已知),∴
(______),∴![](https://staticzujuan.xkw.com/quesimg/Upload/formula/261f4ee9fdc654d0918612f928eb36dd.png)
结论:
;
(2)解决问题:
如图2,若
,分别作
,
,
分别平分
则
的度数=______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c28d2790a97390935125aa897417f970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e600ef0697e740639dc4ecfad0f8a1f.png)
如图1,过P作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/259a6725a9231c13ee8775d84ea397ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56ecb62f248bdff7838382bfd489b788.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b10bb426e00de29d8664ca5babb2f4f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/261f4ee9fdc654d0918612f928eb36dd.png)
结论:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/462f34c23fb8a5ee35cf853b73858fbb.png)
(2)解决问题:
如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6632eb0ec088b390f2bbd4205c29a2e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/898d947a89e07a556d4a9bfdc060d936.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e55ebe52dfc533c972f0a3247b35306c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4659b10b33a8d192ff67b67c93a0cdb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1394f6d35ae61eba1b425b2bfc42e936.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a742abf1b0702125a0c77cbfbef118ca.png)
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【推荐2】如图,已知
,
与
相交于点E,从点E引一条射线
交线段
于点F,若
,
,求证:
.
(已知),
∴
(两直线平行,同旁内角互补),
又∵
(已知),
∴
(____________________),
∴![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
__________(____________________),
∴
__________(____________________),
∵
(已知),
∴
(____________________),
∵
(已知),
∴
(____________________).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a11029ca6b4b9e7f777af0280cf163c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3182db896bc2462331796e2a6108363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0215e13a9fb5574d5194aeb9507a98aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fb3e70c0d0c26b8d0743e7e7a605ab8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a87b4bda65f7080ed398ad23edf551b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91a6fff9a779065091063b10abc0aca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a11029ca6b4b9e7f777af0280cf163c.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/639176c3f300aa6bfadb405aabfbe9c6.png)
又∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fb3e70c0d0c26b8d0743e7e7a605ab8.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea039aa542528318ccf8005699e299d3.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e962382788c6e211bdf42a7a0fe45ef.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a11029ca6b4b9e7f777af0280cf163c.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/665d580fd893b1006567c5cd47899dea.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a87b4bda65f7080ed398ad23edf551b.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91a6fff9a779065091063b10abc0aca.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐1】如图,
为
的中线,点E为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/5/0df616b4-dd83-4d43-b0c3-3dbe531b856c.png?resizew=158)
(1)
,
,求
的度数;
(2)若
的面积为
,
,则点E到
边的距离为多少.
![](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/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/5/0df616b4-dd83-4d43-b0c3-3dbe531b856c.png?resizew=158)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7aa7784e54f59a1dd45274be552f51cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86d03dc7bb044da0863b871064a6748e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb3de20ba8bda63c650ef571be155702.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b72ac611ae66b86761e080761d9aabc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/432cce1481829c4dfe2bd557f6e9aa4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】已知:如图,在△ABC中,AB=AC,AD是△ABC的一条角平分线,AN是△ABC外角∠CAM的平分线,CE⊥AN,垂足为点E.
(1)求证:四边形ADCE为矩形;
(2)连接DE,交AC于点F,请判断四边形ABDE的形状,并证明;
(3)线段DF与AB有怎样的关系?请直接写出你的结论.
您最近一年使用:0次