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解题方法
1 . 数学必修二101页介绍了海伦-秦九韶公式:我国南宋时期著名的数学家秦九韶在其著作《数书九章》中,提出了已知三角形三边长求三角形的面积的公式,与著名的海伦公式完全等价,由此可以看出我国古代已具有很高的数学水平,其求法是:“以小斜幂并大斜幂减中斜幂,余半之,自乘于上.以小斜幂乘大斜幂减上,余四约之,为实.一为从隔,开平方得积.”若把以上这段文字写成公式,即
,其中
、
、
分别为
内角
、
、
的对边.若
,
,则
面积
的最大值为( )
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2022-03-29更新
|
1752次组卷
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9卷引用:江苏省盐城市大冈中学、盐城枫叶国际高中、滨海县八滩中学2020-2021学年高一下学期期中联考数学试题
2 . 已知函数
(
为常数,
)的图象的一个最高点是
,如果将函数
图象上每个点的纵坐标不变,横坐标扩大到原来的
倍,然后再向左平移
个单位长度,就得到
的图象.点
是
的图象上在
轴左侧的最高点中离
轴最近的最高点,点
是
的图象上在
轴右侧的最低点中离
轴最近的最低点,设
(
为坐标原点),则
的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f00b9191adefa4dee98b179e0a06cfe6.png)
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2018高三下·全国·专题练习
3 . 在
中,内角
所对的边分别是
,若
,则
的取值范围为
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![](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/d360b2cefbbef61dfd6d8e1ad3e04059.png)
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C.![]() | D.![]() |
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