如图,四棱锥P-ABCD的底面ABCD是菱形,PA⊥AB,PA⊥AD,且E、F分别是AC、PB的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/69dda575-4b41-45c5-935a-6aa6fca009ce.png?resizew=160)
(1)证明:EF∥平面PCD;
(2)求证:平面PBD⊥平面PAC.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/69dda575-4b41-45c5-935a-6aa6fca009ce.png?resizew=160)
(1)证明:EF∥平面PCD;
(2)求证:平面PBD⊥平面PAC.
更新时间:2022-04-26 20:35:01
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解答题-问答题
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【推荐1】如图,正方体
中,
分别为
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(1)证明:
平面
;
(2)求直线
与平面
所成的角的正弦值.
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(1)证明:
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(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/589c878e789e07e33d65c8a18cf2c58a.png)
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【推荐2】如图,三棱柱
中,
分别是棱
的中点,求证:
平面
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【推荐3】如图,在五面体
中,
平面
,
平面
,
.
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(1)求证:
;
(2)若
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所成角的大小为
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的中点为
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(1)求证:
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(2)若
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【推荐1】如图,在正方体
中,求证:平面
平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3da8c338342e38c9aa3f274c053fd5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e904f34ed352b3d415512662f0ca793d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05e2c66566c2837faaf685324cb0a904.png)
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【推荐2】如图,四边形
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,
,
,又
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![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/7/cb3e1a5d-b6d6-40bf-acdf-695b55698fac.png?resizew=185)
(1)求证:平面
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(2)求三棱锥
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(1)求证:平面
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(2)求三棱锥
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