已知正四面体
的棱长为6,点P在
内(不含边界),若
,则
面积的取值范围为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41e5db1d2fd912f77923e4c120a7dc19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d63bbc0268fcf0b3e65ab17e75234de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fbfcae2cecc98e2d6c16dde6d3ec1c1.png)
A.![]() | B.![]() | C.![]() | D.![]() |
2019·重庆沙坪坝·模拟预测 查看更多[2]
更新时间:2020-02-16 03:51:50
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【推荐1】已知三棱柱
的体积为12,则三棱锥
的体积为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a14c1efa88dec6d67bf72613c1b9f471.png)
A.3 | B.4 | C.6 | D.8 |
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【推荐2】某几何体的三视图如图所示,则该几何体的体积是( )
![](https://img.xkw.com/dksih/QBM/2020/9/13/2549139912065024/2549778236841984/STEM/e1cce4d00f19442c97f778ce7f9d1493.png?resizew=174)
![](https://img.xkw.com/dksih/QBM/2020/9/13/2549139912065024/2549778236841984/STEM/e1cce4d00f19442c97f778ce7f9d1493.png?resizew=174)
A.![]() | B.![]() | C.2 | D.4 |
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【推荐1】设P是
所在平面α外一点,P在平面α内的射影P'在
内部,且P'点为
的外心,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
A.点P到三角形的三个顶点A,B,C的距离相等 |
B.点P到三角形的三边AB,BC,AC的距离相等 |
C.点P到三角形的三边AB,BC,AC的中点的距离相等 |
D.三棱锥P-ABC为正三棱锥 |
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【推荐1】如图,定点A,B都在平面
内,定点
,C是
内异于A和B的动点,且
,则动点C在平面
内的轨迹是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/14/3891b03d-8735-4516-a035-1ed73c4d3a3a.png?resizew=159)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/581d63c89908062be995b29ec238c20a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd1b4b5594177f8a42d6d1ed92427a3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/14/3891b03d-8735-4516-a035-1ed73c4d3a3a.png?resizew=159)
A.一条线段,但要去掉两个点 | B.一个圆,但要去掉两个点 |
C.一段弧,但要去掉两个点 | D.半圆,但要去掉两个点 |
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【推荐2】空间直角坐标系中,O为坐标原点,已知两点坐标为A(3,1,0),B(-1,3,0),若点C满足
=![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3d1a34ae2b8c77f8d7e355c6d1d667e.png)
+![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74c62c14a017007a6bdfe25eada9c433.png)
,其中
,
∈R,
+
=1,则点C的轨迹为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d83068d268aff56766c0d9ac067e040d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3d1a34ae2b8c77f8d7e355c6d1d667e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/858bf8324a9ea8db1a257714ff8afc01.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74c62c14a017007a6bdfe25eada9c433.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b3448a1728b998469d1fcaef320d68a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3d1a34ae2b8c77f8d7e355c6d1d667e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74c62c14a017007a6bdfe25eada9c433.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3d1a34ae2b8c77f8d7e355c6d1d667e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74c62c14a017007a6bdfe25eada9c433.png)
A.平面 | B.直线 | C.圆 | D.线段 |
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