四棱锥P﹣ABCD中,AB∥CD,AB⊥BC,AB=BC=1,PA=CD=2,PA⊥平面ABCD,E在棱PB上.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/2/23e72e83-7552-4255-8d8c-b896597251fd.png?resizew=261)
(Ⅰ)求证:AC⊥PD;
(Ⅱ)若VP﹣ACE
,求证:PD∥平面AEC.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/2/23e72e83-7552-4255-8d8c-b896597251fd.png?resizew=261)
(Ⅰ)求证:AC⊥PD;
(Ⅱ)若VP﹣ACE
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8fed0174cd8f5b698ea9e04db6b3e45.png)
更新时间:2020-05-19 07:41:41
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【推荐1】如图,正方形ADEF与梯形ABCD所在的平面互相垂直,AD⊥CD,AB∥CD,AB=AD=
CD=2,点M是线段EC的中点.
![](https://img.xkw.com/dksih/QBM/2016/3/4/1572520247705600/1572520253890560/STEM/630f01e43cd84445876de32cbee13536.png)
(1)求证:BM∥平面ADEF;
(2)求证:平面BDE⊥平面BEC;
(3)求平面BDM与平面ABF所成的角(锐角)的余弦值.
![](https://img.xkw.com/dksih/QBM/2016/3/4/1572520247705600/1572520253890560/STEM/9454f436a5bd4efab23452ac7a9268bb.png)
![](https://img.xkw.com/dksih/QBM/2016/3/4/1572520247705600/1572520253890560/STEM/630f01e43cd84445876de32cbee13536.png)
(1)求证:BM∥平面ADEF;
(2)求证:平面BDE⊥平面BEC;
(3)求平面BDM与平面ABF所成的角(锐角)的余弦值.
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【推荐2】如图,已知直三棱柱
的侧面
是正方形,点
是侧面
的中心,
,
是棱
的中点.
![](https://img.xkw.com/dksih/QBM/2016/2/15/1572472770240512/1572472776351744/STEM/67fc9a998f6e48edb31552b24930574f.png)
(1)求证:
平面
;
(2)求证:平面
平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57f47d6a88e962cd790d2f159c021ec1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d9a8181f7a7fe7f3fac872ce9534f15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d9a8181f7a7fe7f3fac872ce9534f15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e612b79595292d25bcb611f2cd592044.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/2016/2/15/1572472770240512/1572472776351744/STEM/67fc9a998f6e48edb31552b24930574f.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/280247d7df395bb9ea78c51e67b458d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab3e0dba5705e1d749cfb21ebbb2ed93.png)
(2)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73fcf70859f620a7492e1351327725c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9afac7c616bbb14e1ed428a3c507c7dc.png)
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【推荐1】如图,在四棱锥
中,底面
是矩形,
平面
,
,点
,
分别在线段
,
上,且
,连接
,延长
与
的延长线交于点
,连接
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/7/54209882-cba6-417b-89e8-4a2d4e74a890.png?resizew=294)
(1)求证:
平面
;
(2)若
时,求平面
与平面
所成角的余弦值;
![](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/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a48a7409e1a2071eccd3a0a0ac1699d9.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d822262ff00915910e5b87d81ad1ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb26d84907c923278ac4626a9d58947.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/7/54209882-cba6-417b-89e8-4a2d4e74a890.png?resizew=294)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb841d975d5c7ab05598040e99df6825.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0901e2f5cefe6468cbbcaa332287d63.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73b3cf0f585938ede9eca890a6eb326d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bec7e56107b5f2f34e420caffd1159b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d246f9eceab371ebf47a47c2f11a4ad.png)
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解题方法
【推荐2】如图,在四棱锥
中,平面
平面
.四边形
为正方形,且
为
的中点,
为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/1/a2b67c9d-be3b-4058-979a-2ee0541335e3.png?resizew=172)
(1)求证:
平面
;
(2)求证:
平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f72900e99805cc33b49290b34fdea9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcdaafe875307ac80fbbc4e0d37ee64d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fc5c19ac440746be97d8b46af5d288a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2eacd9c1ce5e65fec29c32f40d86b73d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d4db9b82b67efe45a02fca32bfcf5dc.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/1/a2b67c9d-be3b-4058-979a-2ee0541335e3.png?resizew=172)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/100a16f1365eab6dbad9b46029edff87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d923a338dd2d2e29336b42574d38448.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9abe6e8d1f4f1e8bdc46ddbae0cd789.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ef796b46e68fe77b117ff0483d2370c.png)
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