(1)解不等式:
,并写出它的正整数解.
(2)如图,已知
,
于点D,
于点E.
①求证:
;
②若
,求
的度数.
(3)求证:等腰三角形的底角必为锐角.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00e87f8480e0a055b86a7127b251046b.png)
(2)如图,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebadb0448d99b0130218622c54d1bc19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff9c7cbcc38b28d45c8539710e5b260a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b6cc3789c0e9b7d1226aa0de3327599.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/8/e48bbc42-bf6b-4984-85f7-19f8513cd55f.jpg?resizew=158)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27fdd26060ee9f4e0b79173fdce3cd31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194741f4d2ae7ee44cafca780361446a.png)
(3)求证:等腰三角形的底角必为锐角.
更新时间:2023-07-03 22:27:25
|
相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】解下列不等式,并将解集在数轴上表示出来
(1)﹣x+19≥2(x+5)
(2)
(1)﹣x+19≥2(x+5)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b46adfcf15d7aa0ec7a65c0403a3cdb.png)
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解答题-计算题
|
适中
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【推荐2】(1)计算:2sin45°+
-(π-2022)0-(-1)2022;
(2)若关于x、y的二元一次方程组
满足x-y>0,求a的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59a45d8ab6d7cbe3edd389ae5f7f7eea.png)
(2)若关于x、y的二元一次方程组
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d8963d99ba2304b11ef33afb8d601a2.png)
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解答题-证明题
|
适中
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【推荐1】如图,
,
,
,
.
;
(2)若
平分
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ed1321e4081133b1a8bbe994ecac48a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87c230b2139256d8e4a7f964ccc8136d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/344aef00ac913f6ce14e288e1cb58b41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75d2e5e5ec3caea31e3928183eebbc2b.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/060705794ef87cc71dac40c57f27b1d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d57899ad4774aed9ccc7bd23db72153.png)
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解答题-作图题
|
适中
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【推荐2】已知直线AB∥CD,直线EF与AB,CD分别相交于点E,F.
(1)如图1,若∠1=60°,求∠2,∠3的度数.
![](https://img.xkw.com/dksih/QBM/2018/12/3/2088781780574208/2094713950625793/STEM/6dadea95898d4f71b0522e3a903b0349.png?resizew=481)
(2)若点P是平面内的一个动点,连结PE,PF,探索∠EPF,∠PEB,∠PFD三个角之间的关系.
①当点P在图(2)的位置时,可得∠EPF=∠PEB+∠PFD请阅读下面的解答过程并填空(理由或数学式)
解:如图2,过点P作MN∥AB
则∠EPM=∠PEB( )
∵AB∥CD(已知)MN∥AB(作图)
∴MN∥CD( )
∴∠MPF=∠PFD( )
∴_____=∠PEB+∠PFD(等式的性质)
即:∠EPF=∠PEB+∠PFD
②拓展应用,当点P在图3的位置时,此时∠EPF=80°,∠PEB=156°,则∠PFD=_____度.
③当点P在图4的位置时,请直接写出∠EPF,∠PEB,∠PFD三个角之间关系_____.
(1)如图1,若∠1=60°,求∠2,∠3的度数.
![](https://img.xkw.com/dksih/QBM/2018/12/3/2088781780574208/2094713950625793/STEM/6dadea95898d4f71b0522e3a903b0349.png?resizew=481)
(2)若点P是平面内的一个动点,连结PE,PF,探索∠EPF,∠PEB,∠PFD三个角之间的关系.
①当点P在图(2)的位置时,可得∠EPF=∠PEB+∠PFD请阅读下面的解答过程并填空(理由或数学式)
解:如图2,过点P作MN∥AB
则∠EPM=∠PEB( )
∵AB∥CD(已知)MN∥AB(作图)
∴MN∥CD( )
∴∠MPF=∠PFD( )
∴_____=∠PEB+∠PFD(等式的性质)
即:∠EPF=∠PEB+∠PFD
②拓展应用,当点P在图3的位置时,此时∠EPF=80°,∠PEB=156°,则∠PFD=_____度.
③当点P在图4的位置时,请直接写出∠EPF,∠PEB,∠PFD三个角之间关系_____.
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适中
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【推荐1】(本题满分7分)
如图,
为
的高,
为
的角平分线,若
,
.
(1)
°;
(2)求
的度数;
(3)若点
为线段
上任意一点,当
为直角三角形时,则求
的度数 .
如图,
![](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/268544817735d20ffbceef3b26db5dde.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ef15c28cb324a018a8575133f403506.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/735bd70c2fa2bf51fd7aa448b20d0be1.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32e910dce5a57ff0d917e0b4dd620214.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36719f1e764ee0e719b65c49fae84677.png)
(3)若点
![](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/7bd9311e5295f10061deb2872fe04af5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f03556dce00ae2459f8f8f0e7ffff95.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/24/ae2273e2-f6fa-4077-8669-c7bbe77f1c43.png?resizew=237)
您最近一年使用:0次
解答题-作图题
|
适中
(0.65)
名校
【推荐2】如图,已知
是
的外角
的角平分线,
为
上一点,且
.
![](https://img.xkw.com/dksih/QBM/2021/11/18/2854080169664512/2856116878286848/STEM/b86d6c3c-171e-4fac-80ed-4fa009ec43ae.png)
(1)利用尺规作图找到点
,连接
、
;
(2)求证:
;
(3)求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86a2db6311e228ed33b6c71d0a5918cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c48119b3932497634478f656c752ec4.png)
![](https://img.xkw.com/dksih/QBM/2021/11/18/2854080169664512/2856116878286848/STEM/b86d6c3c-171e-4fac-80ed-4fa009ec43ae.png)
(1)利用尺规作图找到点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2643d057165c69f2be2c65daf3405ca1.png)
(3)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbe10133c5847dc761d769b59451e7ff.png)
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解答题-问答题
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适中
(0.65)
【推荐3】探索发现:如图1,已知直线:
,且
和
、
分别相交于A、B两点,
和
、
分别交于C、D两点,
记作
,
记作
,
记作
.点P在线段
上.
(1)若
,
,请你求出
的度数;
归纳总结:(2)请你根据上述问题,请你找出图中1中
、
、
之间的数量关系,并直接写出你的结论.
实践应用:(3)应用(2)中的结论解答下列问题:如图2,点A在B的北偏东
的方向上,在C的北偏西
的方向上,请你根据上述结论直接写出
的度数.
拓展延伸:(4)如果点P在直线
上且在A,B两点外侧运动时,其他条件不变,试探究
、
、
之间的关系(点P和A、B两点不重合),写出你的结论并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02e03566282ef39ad17821036f228174.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9fce9427c9b17e4d3cda0c3ff3e2e14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f2813ee8f26cca880b6427f5f545d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/172766b458ea1e95ab1f5cd70bab7463.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5b69d40b75d582c4b8ffa2369af1d41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73a34228c2e9340b225b7281383b24d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d57899ad4774aed9ccc7bd23db72153.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd601617f0ab200d5c80c37ab41d7323.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/605f2976297a0deaa1602ef09d6a5afa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0b65ca62ce90b4879f58884e826c669.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8889aad264f6d356c3f8bebe7d92e1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d57899ad4774aed9ccc7bd23db72153.png)
归纳总结:(2)请你根据上述问题,请你找出图中1中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5b69d40b75d582c4b8ffa2369af1d41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d57899ad4774aed9ccc7bd23db72153.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/605f2976297a0deaa1602ef09d6a5afa.png)
实践应用:(3)应用(2)中的结论解答下列问题:如图2,点A在B的北偏东
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d36581140ebac5d28438ea63b1b23b65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
拓展延伸:(4)如果点P在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9fce9427c9b17e4d3cda0c3ff3e2e14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5b69d40b75d582c4b8ffa2369af1d41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d57899ad4774aed9ccc7bd23db72153.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/605f2976297a0deaa1602ef09d6a5afa.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/19/60f58bc6-b38b-4370-8fd4-e066e36c5c08.png?resizew=467)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐1】如图,在
中,
、
边的垂直平分线相交于点
,分别交
边于点
、
,连接
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/7/34a8dd3d-cf38-4a03-b9fa-23b633083d52.png?resizew=204)
(1)若
的周长为6,求
的长;
(2)若
,
,求
的度数;
(3)若
,求
的度数.
![](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/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](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/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/7/34a8dd3d-cf38-4a03-b9fa-23b633083d52.png?resizew=204)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98013a5042685a1db94249e70c62c09a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d3c9ce32b721995f355eea411340e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e19a24762d0c926dec6f464a31df6648.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/358c69b4f6c350c35d19d33c69f2a2a8.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12aa2bb3b37f2d56a287807700d04893.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/358c69b4f6c350c35d19d33c69f2a2a8.png)
您最近一年使用:0次
解答题-问答题
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适中
(0.65)
名校
【推荐2】如图,在
中,
分别垂直平分
和
,交
于
两点,
与
相交于点
.
,则
的度数为 ;
(2)若
,则
的度数为 ;(用含
的代数式表示)
(3)连接
,
的周长为
,
的周长为
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a4fa2c4bd682b3fc8667728ba8f2f02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f44755c5fee4b90266eac73ad47a128.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a424b50eaeafa6f302ffd95476cb86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c4c865445dda4a59b6d5cb18fd74404.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a1be17e0a3e51cde1f50f384198e71e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52f8eff113ca3f0d0200253c7c2f5a7a.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67730019eec7bb987f2d2d1d36566de0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e07505530a9ec2f9c8a23e3c9eafa313.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
(3)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2105973a06b89a2be3939eff0da03e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12225a1a1eda07908309f8100cc34726.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dd6f4250ca6b1b9bce234a01f00d44d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2eaceb8d6c6927e14d9ac7a557a2b11d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d59c6d9b504860487d7240ef603f1c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/735056c174e8dd7906257a2a50a962a7.png)
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