![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
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18-19高一下·安徽亳州·期末 查看更多[3]
更新时间:2019-09-18 15:49:13
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解题方法
【推荐1】已知
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,
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【推荐2】已知
外接圆半径为
,且满足
,
,则
的值为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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【推荐1】已知抛物线
的焦点为
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的直线过
且与抛物线交于
两点,
为坐标原点,若
在第一象限,那么![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bd20adb927eccd5e34c865a1513c16b.png)
_______________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7089148c36cb3c39af71de653756396a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
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【推荐2】如图,某湖有一半径为
的半圆形岸边,现决定在
的北圆心
处设立一个水文监测中心(大小忽略不计),在其正东方向相距
的点
处安装一套监测设备,为了监测数据更加准确,在半圆弧上的点
以及湖中的点
处,再分别安装一套监测设备,且满足
,
.定义:四边形
及其内部区域为“直接监测覆盖区域”;设
.则“直接监测覆盖区域”面积的最大值为_____________
.
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解题方法
【推荐1】在
中,角A,B,C所对的边分别为a,b,c,且满足
,则tanA的最大值为___________ .
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解题方法
【推荐1】已知平面向量
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【推荐2】已知
中,
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______ .若
的中点为
,则中线
______ .
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