解题方法
1 . 已知
是边长为4的正三角形,
分别为
边上的一点(不含端点),现将
折起,记二面角
的平面角为
,若
,则四棱锥
体积的最大值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e58e08ee0b2580a62cf20f709b5e90df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38d0469336f71edd52dc9148c67db052.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff89a768c80c8200e6050dd052ae9fd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3416881a6f67d05fe6b67787047fc86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/048259b64cf454135f2f628cd0f9b3d9.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2 . 已知△ABC三点在平面直角坐标系xoy所在平面内,点B、C分别在x、y正半轴上滑动,
,
,
,则
的最大值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8bd8c13192ca45c16dad5d59b547220.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81f883b21eaf307a451caf46feee0c55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced06b71073e1bb777f326f06016ce17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ace585d3cc2e113a0927cdf9e56756a.png)
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解题方法
3 . 已知单位向量
满足
,
,则对任意
,
的最小值为___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6033601ebf591c1c3b7a95dd00bbb81f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b56ce68a9988c3eab2c652abdc89b89c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bf60e507d2a72cf010998c7bc494754.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c51159984b2cb00f30b3986315019623.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9c95134ef4808453772f5354fc08275.png)
您最近一年使用:0次
2022-01-26更新
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1080次组卷
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4卷引用:浙江省金华十校2021-2022学年高三上学期期末联考数学试题
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