名校
解题方法
1 . 斯特瓦尔特(Stewart)定理是由
世纪的英国数学家提出的关于三角形中线段之间关系的结论.根据斯特瓦尔特定理可得出如下结论:设
中,内角
、
、
的对边分别为
、
、
,点
在边
上,且
,则
.已知
中,内角
、
、
的对边分别为
、
、
,
,
,点
在
上,且
的面积与
的面积之比为
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9f63d194aa0d4091618b6f41f569ee2.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b837fd9c52f60bfb3b6852733abc790.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adbe280d2ae2b53461d7d7110631a17e.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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec3d78dbd5a909f3563c1118a73b53e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f88e21a51b7fae18d443519abe924a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adbe280d2ae2b53461d7d7110631a17e.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/5658e98892d447bf4559cd2f5567b043.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4666b737a55e5d514a97ebd0f805bdd5.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/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7ac5396c5ea442e0364b50c1db3d2da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9f63d194aa0d4091618b6f41f569ee2.png)
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2022-03-16更新
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3卷引用:安徽省六安市第一中学等校2021-2022学年高三上学期12月联考理科数学试题
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解题方法
2 . 春秋以前中国已有“抱瓮而出灌”的原始提灌方式,使用提水吊杆——桔槔,后发展成辘轳.19世纪末,由于电动机的发明,离心泵得到了广泛应用,为发展机械提水灌溉提供了条件.图形所示为灌溉抽水管道在等高图上的垂直投影,在
处测得
处的仰角为37度,在
处测得
处的仰角为45度,在
处测得C处的仰角为53度,
点所在等高线值为20米,若
管道长为50米,则
点所在等高线值为______ .(参考数据
)
![](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/5963abe8f421bd99a2aaa94831a951e9.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0291bbe0ccccc1cd14b5a20eb70c82f0.png)
![](https://img.xkw.com/dksih/QBM/2021/3/15/2678635805884416/2686751250350080/STEM/e590265933d843dbaa1b15fcf86fae5c.png?resizew=265)
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4卷引用:河南省豫北名校联盟2022届高三下学期第三次模拟考试文科数学试题
河南省豫北名校联盟2022届高三下学期第三次模拟考试文科数学试题江西省上高二中2021届高三年级第七次月考数学(文)试题湖南省衡阳市第八中学2022-2023学年高一下学期3月月考数学试题(已下线)专题07 任意角、弧度制、三角函数概念及诱导公式2-期末复习重难培优与单元检测(人教A版2019)
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解题方法
3 . 如图,是我国古代数学家赵爽的弦图,它是由四个全等的直角三角形与一个小正方形拼成的一个大正方形,如果小正方形的面积为4,大正方形的面积为100,直角三角形中较小的锐角为
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4e304cf018473bb54edb166fcd6502b.png)
___ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4e304cf018473bb54edb166fcd6502b.png)
![](https://img.xkw.com/dksih/QBM/2020/8/10/2524670169505792/2527180927287296/STEM/7d811aa0ae8e4d54adbbeadf8eb1d858.png?resizew=114)
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