如图,长方体
的底面ABCD是正方形,点E在棱AA₁上,BE⊥EC₁.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/9/016bf1bf-bea6-44e5-90a3-c4351aa625ee.png?resizew=134)
(1)证明: BE⊥平面EB₁C₁
(2)若AA₁=2,AB=1,求四棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9e58f23f5f154121e7d98af1614ed98.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/9/016bf1bf-bea6-44e5-90a3-c4351aa625ee.png?resizew=134)
(1)证明: BE⊥平面EB₁C₁
(2)若AA₁=2,AB=1,求四棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61c8af4b39696f7a8c10ff1b361087af.png)
更新时间:2023-12-15 16:57:44
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相似题推荐
解答题-证明题
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解题方法
【推荐1】如图,四棱锥
中,底面
的边长为4的菱形,
,
为
中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/10/5b7db9c7-5e9f-4f7b-a507-001862c57139.png?resizew=198)
(1)求证:
平面
;
(2)若
,求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23718955358684b19e533dfa6db6e3ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/10/5b7db9c7-5e9f-4f7b-a507-001862c57139.png?resizew=198)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a5928c98b341b16d4b5a5b931d2929d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cb96e0331eebe80ed1ff610faf531fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51f73a0ca4e6c794242489066fddb6c5.png)
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【推荐2】如图,
的外接圆⊙
的半径为
,
⊙
所在的平面,
,
,且
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/22/240c5ccc-e9a2-4ca9-9406-0bb0d11e438a.png?resizew=169)
(1)求证:平面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d78fc7fcb2762de28dcef8aa3aa0e49.png)
平面
;
(2)求几何体
的体积;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2967337e3fcb228dded64ab0c41a17e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97f30533da2e1d2a958dc906c37eba9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3dc3d90beb344a2a154a90009b51bcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daffba23d64529e8c8fac0424e7c5893.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adc90c2d45477e166b02359525f40aa6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c65c5267eff44141c4da721280db3cf1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/22/240c5ccc-e9a2-4ca9-9406-0bb0d11e438a.png?resizew=169)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d78fc7fcb2762de28dcef8aa3aa0e49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1633988fd62a652de726ee92a917b52d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fa7bbd7831e9ff4f8cffc8889d34f05.png)
(2)求几何体
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9142a8490de14a87eda628ffa7e28982.png)
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解答题-问答题
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较易
(0.85)
名校
解题方法
【推荐1】如图,四棱锥
的底面
是菱形,
,
平面
,
为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/20/adf815b3-05d1-41db-b4f7-985ff1870fab.png?resizew=167)
(1)证明:
平面
;
(2)若
,求四棱锥
的侧面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71a46dc0bb5d8fa33583817e530a5d21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/20/adf815b3-05d1-41db-b4f7-985ff1870fab.png?resizew=167)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/662698361c6b3ddaf0c28a3c87be53e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f83a04565a8ebaa111894b724b0ba266.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
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【推荐2】如图所示的几何体由等高的
个圆柱和
个圆柱拼接而成,点G为弧CD的中点,且C、E、D、G四点共面.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/26/a2bab935-922f-484d-b024-024af2f92396.png?resizew=170)
(1)证明:
平面BCG;
(2)若直线DF与平面AFB所成角为45°,求平面BDF与平面ABG所成锐二面角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d266a04f3dc7483eddbc26c5e487db.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/26/a2bab935-922f-484d-b024-024af2f92396.png?resizew=170)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f09ad78d4eccd1a9c9ccd3c4af79c79.png)
(2)若直线DF与平面AFB所成角为45°,求平面BDF与平面ABG所成锐二面角的余弦值.
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【推荐3】如图,在三棱台
中,
,
平面
,且
为
中点.
(1)证明:
平面
;
(2)若
,求此时直线
和平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ecf072589c0f901d92f6bda111d841.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d05238117a18bedfda506c74d8943c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/26/4fbfbc3f-e005-4783-a9e9-24cba3b354a7.png?resizew=153)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2ffc6952e988d04f22f0fb2f7f0ab7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfb3f0b5d8bf98eeff66f43b7dcbb4be.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08c596aff6331566a0149449183c2024.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d8772aa893a9c1d40f714cb25701701.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74bca84ad86c648d3bb20c8909c8da3f.png)
您最近一年使用:0次