“桃花春色暖先开,明媚谁人不看来”.春天来了,在研学的基地里,小明观察一棵桃树.如图所示,他在点
处发现桃树顶端点
的仰角大小为
,往正前方走
后,在点
处发现桃树顶端点
的仰角大小为
.
的长;
(2)若小明身高为
,求这棵桃树顶端点
离地面的高度(精确到
,其中
).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff47258bb60823c4d84ce19503c96a56.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/68a4c9b697e3df2b5469b71d3b5e47a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(2)若小明身高为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/817af868fea04d562234ba726c4eadf5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/635bc90ea3c6d48d924fb5607ef0f68b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47bb3f35e3db7c1f3a3dd3eb20151b5f.png)
22-23高一下·广东东莞·期中 查看更多[4]
广东省东莞市东莞实验中学2022-2023学年高一下学期期中数学试题(已下线)第6章 平面向量及其应用 单元综合检测-《重难点题型·高分突破》(人教A版2019必修第二册)(已下线)6.4.3.3 余弦定理、正弦定理应用举例——随堂检测(已下线)模块三 专题2 解答题分类练 专题5解三角形(解答题)【人教B版】
更新时间:2023-09-06 15:11:04
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解答题-问答题
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(0.85)
解题方法
【推荐1】已知
的内角
,
,
所对的边分别为
,
,
,记
面积为
,且满足
.
(1)求角
;
(2)若
,且
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ff214d99784c6b23b7784bdaf3ed37a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0914b68f106a912420705b2f3928ca42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1da9dcf6c319174c9ea2b1ceaed1649a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce1132157a33c82610c2d5035493d024.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4887473a8091e1ef53a169cc9f211e3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2fdeba282b028321696be7f90f2cbfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3aa688caadfeb5bdf9c7dfecb5afa31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ff214d99784c6b23b7784bdaf3ed37a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44c4dce884147e801b50675b9c0714e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/872135976af77f3d44ddad6d656eb160.png)
(1)求角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1da9dcf6c319174c9ea2b1ceaed1649a.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3177f577e0cd5f81eb0d20470d744bc4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eda2eb1a695676360689f3040cf6c44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44c4dce884147e801b50675b9c0714e5.png)
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【推荐3】已知函数
,
.
(1)求函数
在
上的单调递增区间;
(2)设
的内角
,
,
的对边分别为
,
,
,且
,
,
,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7abc48b8b65067b15e197adcc416cf8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4166972dec0aa3e8694a44eeb941a08.png)
(1)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1613d377a07850c72cbec354b7a3000f.png)
(2)设
![](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/6e207b2baf056a7d6a6bde1f23bf12bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb925a47e3d93fc09e50e8357f4e8620.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74b577a3ef13b913cee6f9d999e3b800.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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名校
解题方法
【推荐2】△ABC中,a=7,c=3,且
=
.
(1)求b;
(2)求∠A.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c0cc59416b30310683b6c24080758a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eac97e6740365c85ad857aff85cefbe5.png)
(1)求b;
(2)求∠A.
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【推荐1】如图,测量河对岸的塔高
时,可以选与塔底
在同一水平面内的两个测点
.现测得![](https://img.xkw.com/dksih/QBM/2012/6/3/1570877446799360/1570877452058624/STEM/8ee9637afe14440cb033887811e825e2.png)
,并在点
测得塔顶
的仰角为
, 求塔高
(精确到
,
)
![](https://img.xkw.com/dksih/QBM/2012/6/3/1570877446799360/1570877452058624/STEM/a3ac1104702b4050ba30a874cffa4c0f.png)
![](https://img.xkw.com/dksih/QBM/2012/6/3/1570877446799360/1570877452058624/STEM/8e501c0cc86244b0a67e47d6bb0f1277.png)
![](https://img.xkw.com/dksih/QBM/2012/6/3/1570877446799360/1570877452058624/STEM/1f540467ebe6495e9a4b68f7df5ab057.png)
![](https://img.xkw.com/dksih/QBM/2012/6/3/1570877446799360/1570877452058624/STEM/8ee9637afe14440cb033887811e825e2.png)
![](https://img.xkw.com/dksih/QBM/2012/6/3/1570877446799360/1570877452058624/STEM/4d88c50bbd7f45be9baded9956036a3d.png)
![](https://img.xkw.com/dksih/QBM/2012/6/3/1570877446799360/1570877452058624/STEM/8487614fa9024b1e87ca0cee28f69654.png)
![](https://img.xkw.com/dksih/QBM/2012/6/3/1570877446799360/1570877452058624/STEM/46e984db598e4bc6aae0613e654c7950.png)
![](https://img.xkw.com/dksih/QBM/2012/6/3/1570877446799360/1570877452058624/STEM/2de3d1dffdf549e19a6f7235bfd7c85d.png)
![](https://img.xkw.com/dksih/QBM/2012/6/3/1570877446799360/1570877452058624/STEM/a3ac1104702b4050ba30a874cffa4c0f.png)
![](https://img.xkw.com/dksih/QBM/2012/6/3/1570877446799360/1570877452058624/STEM/0a38a1bcc107442eb1a713e997f1207f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4084f37e52c1631113e0955a24281c53.png)
![](https://img.xkw.com/dksih/QBM/2012/6/3/1570877446799360/1570877452058624/STEM/cb31670cf7384d2db9755a830bb7819f.png)
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【推荐2】如图,在一整塔的台阶底部A处测得塔尖B的仰角为
,沿倾斜
的台阶前进250m到达D处测得塔尖B的仰角为
.求:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/7/e98fc816-ad42-4e5a-b021-433eb06062f0.png?resizew=154)
(1)
的度数.
(2)塔的高度BC.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76c12e76fbd84eeec721386bd3b04cc4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a4c9b697e3df2b5469b71d3b5e47a2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/7/e98fc816-ad42-4e5a-b021-433eb06062f0.png?resizew=154)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/868ff1350bd72625328c85c3097cd85e.png)
(2)塔的高度BC.
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