如图,在四棱锥P-ABCD中,
为正三角形,四边形ABCD为矩形,且平面PAB⊥平面ABCD,AB=2,PC=4
![](https://img.xkw.com/dksih/QBM/2020/12/7/2609273135898624/2611427598327808/STEM/aa3685c72352404cb37106ddc569c4c3.png?resizew=154)
(1)求证:平面PAB⊥平面PAD
(2)若点M是PD的中点,求三棱锥P-ABM的体积
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2205cffebf8c4d5f81d15ed7b85c8936.png)
![](https://img.xkw.com/dksih/QBM/2020/12/7/2609273135898624/2611427598327808/STEM/aa3685c72352404cb37106ddc569c4c3.png?resizew=154)
(1)求证:平面PAB⊥平面PAD
(2)若点M是PD的中点,求三棱锥P-ABM的体积
更新时间:2020-12-10 23:05:57
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【推荐1】如图,边长为3的正方形ABCD中,点E是线段AB上的动点,点F是线段BC上的动点,均不含端点,且满足
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(1)求证:
;
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(1)求证:
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(2)当
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【推荐2】如图所示,在三棱锥
中,
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(1)求证:平面
平面
;
(2)求四面体
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/762cd2d2e0550938fe77347b4a3a42ba.png)
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(2)求四面体
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【推荐1】如图,边长为2的正方形ABCD所在的平面与半圆弧CD所在平面垂直,M是CD上异于C,D的点.
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(1)证明:平面AMD⊥平面BMC;
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【推荐2】如图,四面体
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bd6a2b112facda441f4e34bf5c145fa.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/3/82a4c50d-6320-40fc-b4a9-70efe63655e8.png?resizew=171)
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