1 . 记
的内角
、
、
的对边分别为
、
、
,已知
.
(1)证明:
;
(2)若
,
,角
的内角平分线与边
交于点
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/157d2f0f0db718649f148134436c3a43.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/428d8ba5d74557ac0660343e61b3bd8f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e258ab9e600435b37465092243d99f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9597cc64469c379d47dfc6b3f27feee7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
您最近一年使用:0次
2023-04-07更新
|
2136次组卷
|
3卷引用:东北三省三校(哈师大附中、东北师大附中、辽宁省实验中学)2023届高三二模数学试题
2022·全国·模拟预测
解题方法
2 . 在①
,②
,③
且
这三个条件中任选一个,补充在下面问题中,并解答.
在△ABC中,内角A,B,C的对边分别为a,b,c,______.
(1)求证:△ABC是等腰三角形;
(2)若D为边BC的中点,且
,求△ABC周长的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/981cb688a4e15d31e7a43115aa701f98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa6ae5122d84253a8f5b87da2e389603.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1e2e6dd48b13e0c4dcd7f0eaf474f36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a68c4981b1a17cee55c5088c092af9d5.png)
在△ABC中,内角A,B,C的对边分别为a,b,c,______.
(1)求证:△ABC是等腰三角形;
(2)若D为边BC的中点,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4aca5534bce25acaeb7379deed8f8f.png)
您最近一年使用:0次
2023·全国·模拟预测
解题方法
3 . 在△ABC中,角A,B,C的对边分别为a,b,c,
.
(1)求证:
;
(2)若
,
,求△ABC的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1374a85c9eedaf92e63956533bbd0959.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e620a0ef4c8a7e05bfb1d7248a3c823.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4580cc037c0c760c728cdbb74a8154c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a95fd738d95dfe5261cdae7f86abbfa.png)
您最近一年使用:0次
4 . 记
的内角
的对边分别为
,已知
,
是边
上的一点,且
.
(1)证明:
;
(2)若
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a9069499bd3bd7cc7112eb42d8984f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62a3bf6da4d9823ceaf3ec8b03b44de7.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41ca7e840268b42f41ce1975962382c2.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8cabcef1cee1213140371c499339864.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ba1883c53ebf30a9e53e9b7f3bce4ba.png)
您最近一年使用:0次
2023-03-21更新
|
1289次组卷
|
3卷引用:海南省海口市2024届高三摸底考试数学试题
解题方法
5 . 已知
是斜三角形,角A,B,C满足
.
(1)求证:
;
(2)若角A,B,C的对边分别是边a,b,c,求
的最小值,并求此时
的各个内角的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48ff86326ecada7efff4f76831f69a23.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/030b81c1ae99d9668ce18de8a66ef4ce.png)
(2)若角A,B,C的对边分别是边a,b,c,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18656e89c57aaa7b365fc73fa0c913e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
您最近一年使用:0次
2023-04-06更新
|
717次组卷
|
2卷引用:2023届高三冲刺卷(二)全国卷-理科数学试题
2023·全国·模拟预测
解题方法
6 . 已知
的内角A,B,C所对的边分别为a,b,c,点D在边BC上,
,
,
,且
.
(1)证明:
;
(2)求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fcc2395b0f29789352052f247a79805.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63437101184ed8342d2bfc59af1fb32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25da94a4be824359ef3102fc4cd44b90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5f99ef990700f36447aa13121c2d6a2.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60b767e7e0ae62c21dc7469c8e0b8572.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/212dfc0ea675782f4c65e285acc0d247.png)
您最近一年使用:0次
2023·全国·模拟预测
7 . 如图,在
中,
,
为边
延长线上一点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/30/d47add01-9be5-441b-9bd1-3573cc7a4d26.png?resizew=147)
(1)求证:
.
(2)若
,
,
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b71753fcde0d1225b707eb8e50d20638.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/30/d47add01-9be5-441b-9bd1-3573cc7a4d26.png?resizew=147)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d89b0b83aaed656110a29f78a495bf93.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0d5a2cd05e4476fc72271e8fdb59a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b515965c22d2950b592c096c6e3bdfd4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/039c0d87cc4639086867b9832c6d9ad1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c44ce799d9835933017b9cac05ed6077.png)
您最近一年使用:0次
2023·全国·模拟预测
解题方法
8 . 设
,
,
分别为
的内角
,
,
的对边,且
.
(1)求证:
;
(2)若
,
,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/1465a784730a54b101e8d59a9067d9f9.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f756d66eb0e623a391733dbf7c4f7c.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a8b23c83a0504c56bfe99b31f7303b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1e39b46f37f97f04bb13af59b1ff89f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
您最近一年使用:0次
9 . 在
中,角A,B,C所对的边分别为a,b,c,已知
.
(1)证明:
;
(2)若
,
,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/568c523263499e92919b60efacc157ae.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/baa8d75a6638e08eedbff8662267da6f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ce0015d60dc50ecf6d85015e520d234.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ae7888d643678ea18f83f3237732052.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
您最近一年使用:0次
2023-02-17更新
|
848次组卷
|
2卷引用:天一大联考皖豫名校联盟2023届高三第三次考试数学试题
10 . 在三角形
中,角A,B,C所对应的边分别为a,b,c,且
.
(1)从下列中选择一个证明:
①证明:
;②证明:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b22500a705ee509cc9633585b95df252.png)
(2)求三角形
面积的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/118046cea3444ffb4a200a70a9612d42.png)
(1)从下列中选择一个证明:
①证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bcf9a85dda185f77d852e4b5444ac4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b22500a705ee509cc9633585b95df252.png)
(2)求三角形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
您最近一年使用:0次