如图a,在直角梯形ABCD中,AB⊥AD,AD∥BC,F为AD的中点,E在BC上,且EF∥AB.已知AB=AD=CE=2,沿线段EF把四边形CDFE折起如图b,使平面CDFE⊥平面ABEF.
(1)求证:AB⊥平面BCE;
(2)求三棱锥
体积.
(1)求证:AB⊥平面BCE;
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b32fdd65aa55d1833750ef453a295d19.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/16/13712104-aa7a-4a66-9e51-d38d1f55eb5a.png?resizew=258)
2011·江苏淮安·模拟预测 查看更多[2]
更新时间:2016-11-30 21:12:52
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相似题推荐
解答题-证明题
|
适中
(0.65)
解题方法
【推荐1】如图在三棱柱
中,
平面
,
、
分别为
,
的中点.
![](https://img.xkw.com/dksih/QBM/2016/5/26/1572650359750656/1572650366058496/STEM/ce0274fed79f4218aa7e6004296c2e13.png)
(1)求证:
平面
;
(2)求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a8bfe2553e852df73185d017c0a62fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0ee3f1311d472e721697055f935288e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f1f229274a6e17977cc047814212589.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/2016/5/26/1572650359750656/1572650366058496/STEM/ce0274fed79f4218aa7e6004296c2e13.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/484134812351ae9f1075b9ba805b26b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62871bb0dff211fc3bd80f9066c25b29.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf81f142b84adcf278b51c62c88e6afc.png)
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名校
解题方法
【推荐2】如图,在四棱锥
中,
,底面
为梯形,
,
.
中,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/8/5c647464-d19b-4dc3-9ed0-c3f2a30d2a08.png?resizew=158)
(1)若
是线段
上的点,平面
平面
,且
,试判断点
的位置并说明理由;
(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/81f17680a23635f823b7dc446e4f3b0a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a11029ca6b4b9e7f777af0280cf163c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6acb69f52b245011a41daaefd5b2a316.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55a675310c8ba418e5a59beb7317e21e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d97afe2733b75e9ea3de65c882f851c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3b10835116b9b777a666b438c907b49.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/8/5c647464-d19b-4dc3-9ed0-c3f2a30d2a08.png?resizew=158)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86c44a3e2af1ebe34dd570dbd58c61dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/747e7c4b2f940a9f0a7300a5d0f11cdb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d5b5c88bed3eb4d5eb2f2a5d25f0bc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/feb67f27bcda7681b19239a199b4c4d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddfe0ccf24d760c77535a70c92dad145.png)
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解答题-证明题
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适中
(0.65)
名校
【推荐1】如图所示,正方形
与矩形
所在平面互相垂直,
为线段
上一点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/9/db7af188-2f32-40a5-93d6-5404829e0c89.png?resizew=227)
(1)求证:
;
(2)在线段
上是否存在点
,使二面角
的大小为
?若存在,求出
的长;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7253ffd3fc633d861810ee2e872188b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d483d64697d534891f1265441f6c515.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/9/db7af188-2f32-40a5-93d6-5404829e0c89.png?resizew=227)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0fa81c1f81266b4ef3d471bc6bfc38d.png)
(2)在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35988677892d6ffdf4773f7a861f26a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/037fb348109dc2063a268b10eb925a57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
您最近一年使用:0次
解答题-证明题
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适中
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名校
解题方法
【推荐2】如图,三棱柱
的侧面
是菱形,
.
![](https://img.xkw.com/dksih/QBM/2021/4/23/2706053074853888/2730860411699200/STEM/e600ea1d3bf3419ea4af6157582aef75.png?resizew=209)
(1)求证:
平面
;
(2)若
,
,且二面角
为直二面角,求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58cc6184b191e6da43911e701121517e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07e8af8caf4f395dc9a59903a7dba85a.png)
![](https://img.xkw.com/dksih/QBM/2021/4/23/2706053074853888/2730860411699200/STEM/e600ea1d3bf3419ea4af6157582aef75.png?resizew=209)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e89195bacd53d43195e70c12b5cfa041.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea848cd2aa3a464618020475097949fc.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecb98a9240ab95180c6d1a2715e000d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39d31a4ddb10768e9e7868d0c34c425f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6997af36a239195f7b55557242cb03c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4266cebdab2467cf7147c372e6928c7.png)
您最近一年使用:0次
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【推荐1】如图1,在矩形
中,
,
,将
沿矩形的对角线
进行翻折,得到如图2所示的三棱锥
.
时,求
的长;
(2)当平面
平面
时,求平面
和平面
的夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ffc2817fa590affb5a760a25dc65308.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a77e3c1c236141d6118429fade0a9b9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(2)当平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcf6dc837ae85207789b94d109c5c2eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4eb7e9ad5486cf1c5e506b20c5469e8.png)
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解答题-证明题
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适中
(0.65)
【推荐2】在三棱锥
中,
,平面
平面ABC,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/22/24b554a3-f871-428d-9d93-7172b0969ec4.png?resizew=147)
(1)证明:
平面
;
(2)棱BC上是否存在点D,使得面
与面
的夹角为
?若存在,求BD长度;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a15a004f7d47ed595f063e60075223a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4aa9084b8fe0fe05c4388d1f835587b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db99494753dbb4588ded0394a9e18607.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/376c005548874df605a76a086a82c76c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a9b8e7befcb7881c294070175b1a554.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/22/24b554a3-f871-428d-9d93-7172b0969ec4.png?resizew=147)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2ffc6952e988d04f22f0fb2f7f0ab7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4da035673ef0edcfae6b72fb5e5ba34a.png)
(2)棱BC上是否存在点D,使得面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27d39f37441ee55dbc8f1a6ca199a66b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3520ee9cc97a075e889e1625dba1157c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c8ae071199874d9d74a4919a58902f7.png)
您最近一年使用:0次
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名校
【推荐3】如图,在四棱锥
中,底面
为菱形,平面
平面
,
,
,
,
是线段
的中点,连结
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/9/a297373a-f6b4-4c49-aea6-7ce1ef4f960f.png?resizew=254)
(1)求证:
;
(2)求二面角
的余弦值;
(3)在线段
上是否存在点
,使得
平面
?若存在,求出
的值;若不存在,说明理由.
![](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/74d3b7f82ea9e9b2c447d41e25f5293d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68f93cdaeccffdcece4bb3a657088c88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e7a827319eb3d712be47e6a8a6c3ab4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00ac9dcd00d4fe6bbd7b50190d2d21aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/9/a297373a-f6b4-4c49-aea6-7ce1ef4f960f.png?resizew=254)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dbd5a0555343744f1b300eecba8813f.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5d3e7db2b553b163d46c501662d0403.png)
(3)在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46dc9a47df38e1e0cdd3196bae90f1f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd5363cf14b556c0a9b57f6f57e8927d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdcd55ad87acd31ce56136e0c11ed300.png)
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