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1 . 我国南宋著名数学家秦九韶在其著作《数书九章》中给出了三角形的面积公式:已知
的三边分别为a,b,c,则
的面积
.在
中,
,
,则
面积的最大值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3a16439a588c931f2ad5542386b680d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb1ec9c5eaed4c211a040a2a33fb7c91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f34b5e49102150ea3570b9f2b983ec4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
A.12 | B.10 | C.8 | D.6 |
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解题方法
2 . 已知
的内角A,B,C的对边分别为
,
,
,且满足![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96b6e728cbbbc3fe6319e7cedd91938b.png)
(1)求
.
(2)若△ABC为锐角三角形,求
的取值范围 .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/96b6e728cbbbc3fe6319e7cedd91938b.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35a2cc49fbfb9081b47ae866ffcfb257.png)
(2)若△ABC为锐角三角形,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67b5c6f74fb9ef3524cca9c900374c00.png)
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2023-06-09更新
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445次组卷
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3卷引用:安徽师范大学附属中学2022-2023学年高一下学期期中数学试题
安徽师范大学附属中学2022-2023学年高一下学期期中数学试题重庆市三峡名校联盟2022-2023学年高一下学期联考数学试题(已下线)6.4.3 课时3 余弦定理、正弦定理应用举例-高一数学同步精品课堂(人教A版2019必修第二册)
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解题方法
3 . 已知
三个内角
、
、
的对应边分别为
、
、
,且
,
.则下列结论正确的是( )
![](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/e899c486dc49e560fc4aca05e16835b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa4c355f11471a38f5583a434a1ddeb3.png)
A.![]() ![]() |
B.![]() |
C.![]() ![]() |
D.![]() ![]() |
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2023-06-02更新
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2卷引用:安徽省亳州市第一中学2023届高三最后一卷数学试题
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4 . 在
中,
,D为BC边上一点,且
,则
的最小值为___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/819c7a62f0c3f64f53370d19db912c13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71850e666ff879c9bd51008bfdc0bdfa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3d1be9b1e742b25e355af14502549cb.png)
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2023-05-29更新
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9卷引用:安徽省亳州市第二完全中学2023-2024学年高一下学期第一次月考(3月)数学试题
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5 . 方山双塔位于台州市黄岩区九峰公园内紫云峰之巅.南宋宝章阁直学士章雄飞《游九峰寺》诗中赞道:“九峰突地三千丈,双塔攒空十二层”.为了测量南塔高度,某同学设计了如下测量方法:先在塔底平台A点处测得塔底中心O在北偏西
方向,塔顶仰角的正切值为
,再走到距离A点25米的点B处,测得点O在北偏东
方向,塔顶仰角为
,则该塔的高度为___________ 米.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16aa0b9869db50a9ab48cc32925d8e96.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4b8503f4706b8321e4e79a87eadea84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/391479c151307826c9765a47a5f10503.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c67d01e61dc0042e67b5e8ec8e727c22.png)
![](https://img.xkw.com/dksih/QBM/2023/5/13/3236913740677120/3242569932718080/STEM/e582bbc6c4a24a1fb81c69cd6bcf540b.png?resizew=284)
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2023-05-21更新
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2卷引用:安徽省合肥市六校联考2022-2023学年高一下学期期末教学质量检测数学试卷
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解题方法
6 . 在
中,角A,B,C的对边分别为a,b,c,且
.
(1)求角A;
(2)若
的面积为
,求a的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18a1633cddc3055a2932367df8289cbb.png)
(1)求角A;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2ca820a456491348e72587e4fe10bc6.png)
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2023-05-21更新
|
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4卷引用:安徽省皖北县中联盟2022-2023学年高一下学期5月联考数学试题
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解题方法
7 . 如图所示,已知
的外接圆半径为
,
,
是线段
,
上的两点,点
是
的外心,且
是线段
的中点,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/11/ca5e7465-f330-4d36-90eb-4501995e8263.png?resizew=150)
(1)证明:
;
(2)求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11bc05f41215f9894e11d1df0465751a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.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/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afdf61958000c4eb2ed8f0fa14b4d079.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/11/ca5e7465-f330-4d36-90eb-4501995e8263.png?resizew=150)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18d1acafc029137cc19914ba054cfe35.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47f5766b3b9619115bcad4a201475cb4.png)
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8 . 已知
的三个内角
所对的边分别为
,且
,
,设
,
的周长为
.
(1)当
时,求
的值;
(2)求函数
的解析式及最大值.
![](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/e899c486dc49e560fc4aca05e16835b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfbbb35bd00d5e0ce32a4c1b4edaa715.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/104e4c6253dac1d2ceb5376aa060433a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c63e1c64c42b7f3b7fdc396d4756cab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
(2)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
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9 . 如图,某城市有一条公路从正西方
通过市中心
后转向东偏北
角方向的
,位于该市的某大学
与市中心
的距离
km,且
. 现要修筑一条铁路
,
在
上设一站
,在
上设一站
,铁路在
部分为直线段,且经过大学
,其中
,
,
km.
与站
的距离
;
(2)求铁路
段的长
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a7d3fd77c692a3cecad4c96626dbeb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f7c685250e7a41e94df3a5aaaa7f026.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c88d9142df6ba8e43c1a93bd04a1362.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c88d9142df6ba8e43c1a93bd04a1362.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9a7de5b70003502e40b95b3b7d3d933.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b247b79a49cdcfc52f5a2e4f1e9101c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff4a7376fe01a2791ed6a39699433f2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
(2)求铁路
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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2023-05-20更新
|
533次组卷
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5卷引用:安徽省合肥市肥东县综合高中2022-2023学年高一下学期2月第一次月考数学试题
解题方法
10 . 从条件①
;②
中任选一个,补充在下面问题中,并加以解答.
在
中:内角
,
,
的对边分别为
,
,
,__________.
(1)求角
的大小;
(2)设
为边
的中点,求
的最大值.
注:如果选择多个条件分别解答,按第一个解答计分.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ea1330b1f0ab90aeb4ffb5a58a27651.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c870cb4f74ccc0b132a8a4f56dd5ea86.png)
在
![](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)
(1)求角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff640580ff030448e421a31170a1d78e.png)
注:如果选择多个条件分别解答,按第一个解答计分.
您最近一年使用:0次