1 . 在
中,
是
的平分线,如图所示,用正弦定理证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea5ca418ff0d36929cd06551f74d58c2.png)
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解题方法
2 . 在
中,已知
,试判断
的形状.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a641da1c70d0ad481082af87e98ccbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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2023-09-24更新
|
192次组卷
|
4卷引用:苏教版(2019)必修第二册课本例题11.2正弦定理
苏教版(2019)必修第二册课本例题11.2正弦定理湘教版(2019)必修第二册课本例题1.6.2正弦定理(已下线)专题1.7 余弦定理和正弦定理-重难点突破及混淆易错规避(人教A版2019必修第二册)(已下线)专题11.2正弦定理-重难点突破及混淆易错规避(苏教版2019必修第二册)
3 . 解下列不等式:
(1)
;
(2)
;
(3)
;
(4)
.
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4c6316621e3ac48f4e256e8b6d6d622.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c447c4e739e50f3630d5ac57aa9cf0bc.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fce141204a83935f3330a9ab335a7a2d.png)
(4)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b084d0a77cc5e0e7ddc287be6c1e9de9.png)
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4 . 如图,在
中,
,
,
,且
.当
的面积最小时,求a,b的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df81cda12d7601d58b1d9c7c180c4d66.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e781a2489271bfd1597cba1bb6f5887.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/650e1fbe70fe158d525e096ba2bef858.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/24/9f4a1861-15b6-4014-a5a2-f44edc86e541.png?resizew=98)
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5 . 用长为
的铁丝围成一个矩形,怎样才能使所围矩形的面积最大?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d2a7b13d95229e2e938514739054541.png)
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解题方法
6 . 已知函数
,
,求此函数的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbb8854f8437b8146a5ffc294ce3469d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d4e7066166166f9734c6cff7d8436d8.png)
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2023-09-22更新
|
135次组卷
|
2卷引用:苏教版(2019)必修第一册课本例题3.2 基本不等式
7 . 设a,b为正数,证明下列不等式成立:
(1)
;
(2)
.
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3aa23408bcc9f6200f22a310e5f2569a.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7efecdd67f1088510886e88b80263bd8.png)
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8 . 画出数列
,的图象,并求通过图象上所有点的直线的斜率.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6716ddb0e578ccce20f142ad8e292e8.png)
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9 . 在
中,已知
,
,
,求c.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab839d8569171afab5ed55c22013aa72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03837b3769eda7f0d3804cc5ad4a6d60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0334bc85843337c4dfcfdc5c638f9f62.png)
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10 . 在
中,已知
,
,
,解这个三角形(角度精确到
,边长精确到0.1cm);
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5119262ff121a9874329060c36b9fd5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a456a15be5cda146bfbb763c72c6c5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be03f5883976479e123ea1d02ef56f90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4c74a88e12936aaa3518764d5fb5192.png)
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