1 . 在
中,角A,B,C所对的边分别为a,b,c,下列判断正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
A.若![]() ![]() |
B.若![]() ![]() |
C.若![]() ![]() |
D.若![]() ![]() |
您最近一年使用:0次
2021-09-02更新
|
449次组卷
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2卷引用:江苏省无锡市第一中学2020-2021学年高一下学期期中数学试题
解题方法
2 . 设
的内角
、
、
的对边分别是
,
,
,
,且
为钝角.
(1)证明:
;
(2)求
的取值范围.
![](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/c7547e9ba4cc2787d8f9d59ecf1eb202.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfd2d90ed8b5f265bb5b0a8c84b4b743.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05d218a405fae9905116d6587cb9396b.png)
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3 . 山顶有一座石塔
,设塔顶
在地面上的正投影为点
.记石塔的高度
,山的高度
.
(1)如图(1),若以
,
为观测点,在塔顶
处测得地面上一点
的俯角为
,在塔底
处测得
处的俯角为
,用
,
,
表示山的高度
.
(2)如图(2),若将观测点
选在地面的直线
上,记
,已知石塔高度
,称
为在
点观测石塔
的视角,请试着使用
,
表示
;并依据你的结论解决如下问题:如果满足当
时,观测
的视角(即
)最大,求山的高度
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e781a2489271bfd1597cba1bb6f5887.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d48454bfb3fe1f67a7945371ccd50d4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/15/a6a13ff9-ff03-4a94-a5b4-378c3d5948a3.png?resizew=273)
(1)如图(1),若以
![](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/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eabd5f3a86afe49dcd70571e2b96cfd.png)
(2)如图(2),若将观测点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c421ab2dc57f44899efb36549781347.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aacfa2d8b8230a5b6c4c0791cc66a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6282292819434a8905a212427613fd85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eabd5f3a86afe49dcd70571e2b96cfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42c95d7efce01ed6ef4b759fa3f63c82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f7347c2e09f033ae04c0cc83f934e2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6282292819434a8905a212427613fd85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eabd5f3a86afe49dcd70571e2b96cfd.png)
您最近一年使用:0次
2021-07-10更新
|
350次组卷
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3卷引用:江苏省无锡市第六高级中学2021-2022学年高一下学期期中数学试题
20-21高一下·浙江·期末
名校
解题方法
4 . 已知角
是
的三个内角,下列结论一定成立的有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
A.![]() |
B.若![]() ![]() |
C.若![]() ![]() |
D.若![]() ![]() |
您最近一年使用:0次
2021-05-19更新
|
1054次组卷
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4卷引用:江苏省无锡市第一中学2021-2022学年高一艺术班下学期期中数学试题
名校
解题方法
5 . 已知tanα<0,
(1)若
求
的值;
(2)若
求tanα的值.
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81722af1b0e73f677b32822bc1daf13b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bb6ee46be8ff6f5514efe6bd16b0580.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ad4057894b580cac0ba473548b00b98.png)
您最近一年使用:0次
2020-11-02更新
|
1725次组卷
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5卷引用:江苏省无锡市天一中学2018-2019学年高一上学期期中数学试题
6 . 已知
,则
的值是_____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb37b4ae029015d2086b35a1f9cec0ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e80cbf3d4d60c3274e823160a600103a.png)
您最近一年使用:0次
2019-09-12更新
|
1771次组卷
|
13卷引用:江苏省无锡市天一中学2018-2019学年高一下学期期中考试数学(平行班)试题
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