如图,
,
,
,
、
交于点
,连接
,
(1)求证:
,
;
(2)判断下列两个结论是否正确,(正确打“√”,不正确打“×”),若正确请证明:
①
平分
: ______
②
平分
:______
(3)若
,且
,试判定线段
,
,
之间有什么样的数量关系,说明理由?(可以自己画图)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d89ba4036a5d18ec4abed44d7fd8e89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5eaffcd2070bfcb1955e2cab66c26c06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f145e6d68a0903d4d10f27cf647ddc7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6655e2fa64a32cd12fe0279afd65d73.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/6/52622ef0-c568-40f2-89fd-c29f16593b99.png?resizew=194)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c503e29373e8d87134bdb46bd3912910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec9304227fe9f6524afc56b952d051f1.png)
(2)判断下列两个结论是否正确,(正确打“√”,不正确打“×”),若正确请证明:
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6655e2fa64a32cd12fe0279afd65d73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/727ad3e630a224303d6d3b8ad5c114ba.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e0ae50d5993a332b5cddb022eaa6f1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9c332ad200f0bb51b013a3668146eb.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/589dcfe35daafe7ec11208805cd35b13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df34369163e511f14028168cb0b21186.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6655e2fa64a32cd12fe0279afd65d73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7e4fa04825ac7d071968056322d88be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a16f5621716bfef7a056a3f2712feb4.png)
更新时间:2023-11-05 17:31:18
|
相似题推荐
解答题-证明题
|
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【推荐1】如图,在菱形
中,点E,F分别在边
,
上,
,连接
,
.
求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d38d97f03faed3152db2fd3bd1919944.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e54d12543ff4c7e6c143ca083167f4d.png)
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解答题-作图题
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【推荐2】如图,已知ΔABC.
(1)在AC的上方作射线AE, 使∠CAE =∠ACB(尺规作图,保留作图痕迹,不要求写作法);
(2)在(1)的条件下,在射线AE上取一点D,使AD =BC,连接CD,请说明∠ADC =∠B.
(1)在AC的上方作射线AE, 使∠CAE =∠ACB(尺规作图,保留作图痕迹,不要求写作法);
(2)在(1)的条件下,在射线AE上取一点D,使AD =BC,连接CD,请说明∠ADC =∠B.
![](https://img.xkw.com/dksih/QBM/2020/8/14/2527581670891520/2531243325841410/STEM/017dbda3c63e443e95ad5d8dbe101422.png?resizew=168)
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解答题-问答题
|
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(0.85)
名校
【推荐1】如图,
,
,直线
经过点
.设
,
于点
,将射线
绕点
按逆时针方向旋转
,与直线
交于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/85816e0e-fe2d-42a3-8f3e-9ff6cb136bbc.png?resizew=397)
(1)判断:
___________
(2)若
,求
的长
(3)若
是锐角三角形,直接写出
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3bbe4cdd2c154bd9a8073b0d4cecb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4009aa13093cc3865dcd51b371892160.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18d39f0b9bec27401e9702f124a5fc2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62fc6421dad5407bca9c74ab81922022.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/85816e0e-fe2d-42a3-8f3e-9ff6cb136bbc.png?resizew=397)
(1)判断:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3070da6168b2b3da9f4aeef3201deb5.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/addb8e20db1fbb40f17dea52f951b907.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
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解答题-证明题
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【推荐2】如图,在菱形
中,
,点E,F分别在
上,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/21/64006bc2-21ad-408b-84d7-5b1ab8869f79.png?resizew=179)
(1)求证:
;
(2)判断
的形状,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a690535ef8766d108cce93b9e8544311.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7e545f31f7cc57a31843f5adfd02941.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/560daab15f80ef8171d6fef75042921d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/21/64006bc2-21ad-408b-84d7-5b1ab8869f79.png?resizew=179)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e7f515a88b4fcfd3274ef0a287e8304.png)
(2)判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f2ea13010e2399194be2a681310543e.png)
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解答题-证明题
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【推荐1】如图,
,
,
为垂足,
,
为垂足,
,
相交于点
,连接
,求证:
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/4/b9c18545-c491-4244-a2c4-6b95c3708b76.png?resizew=173)
(1)
;
(2)
平分
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d320f180419175d75eebc618cc458b39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b757f0c42ae5c9a2d6a4b19e5877b27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.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/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/4/b9c18545-c491-4244-a2c4-6b95c3708b76.png?resizew=173)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2d212c1709b8e72a055cf1b5381ef64.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12a477603f3f88c3b48352b6130f9ad5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6c19410c7abeae002ca97cfad4c791f.png)
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解答题-证明题
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【推荐2】我们在学习《
线段、角的对称性(4)》这节课的时候,课本中的例2证明了“三角形的三条角平分线相交于一点”,我们再重温一遍证明过程.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/5/7904edc3-ddf1-4faa-b36e-df3c61e4eeab.png?resizew=566)
(1)请补全课本例2的证明过程;
(2)运用上述结论解决下面的问题:
如图,在
中,
,垂足为H,点D、E在
上,且
,连接
并延长,交
于点F,连接
.求证
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a637e8f4e368c079616955509b1717e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/5/7904edc3-ddf1-4faa-b36e-df3c61e4eeab.png?resizew=566)
(1)请补全课本例2的证明过程;
(2)运用上述结论解决下面的问题:
如图,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd7b39fcb6d96e2951c745c8978cbe2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb79d60c76042efea78c4627514bb18b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df325a3e4780658733e97b69c8f11deb.png)
![](https://img.xkw.com/dksih/QBM/2022/11/3/3101607828021248/3122970534076416/STEM/d2a3fe3437dc469a806a0e8a086b4650.png?resizew=215)
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解答题-证明题
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【推荐1】如图1,点O是线段AD的中点,分别以AO和DO为边在线段AD的同侧作等边三角形OAB和等边三角形OCD,连接AC和BD,相交于点E,连接BC.
(1)证明:⊿ABC ≌ ⊿DCB;
(2)求∠AEB的大小.
(3)如图2,△OAB固定不动,保持△OCD的形状和大小不变,将△OCD绕点O旋转(△OAB和△OCD不能重叠),求∠AEB的大小.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/17/23f3ebee-be5c-4cf2-81ea-69324451c399.png?resizew=461)
(1)证明:⊿ABC ≌ ⊿DCB;
(2)求∠AEB的大小.
(3)如图2,△OAB固定不动,保持△OCD的形状和大小不变,将△OCD绕点O旋转(△OAB和△OCD不能重叠),求∠AEB的大小.
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解答题-作图题
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【推荐2】如图,
中,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/14/9951a7d0-46cc-4128-8427-3cb4eb8b1eb7.png?resizew=174)
(1)在
上找一点
,连接
,使得
为等边三角形(要求:尺规作图,不写作法,保留作图痕迹);
(2)求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9353282266be4204a7b6e6f237176855.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5b8b98b2f83279a49e94d9f48c5e6f2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/14/9951a7d0-46cc-4128-8427-3cb4eb8b1eb7.png?resizew=174)
(1)在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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