如图,在四棱锥P-ABCD中,底面ABCD是直角梯形,且AD∥BC,AB⊥BC,BC=2AD,已知平面PAB⊥平面ABCD,E,F分别为BC,PC的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/13/c752dd6b-d635-4f34-8a55-144a142d71d0.png?resizew=131)
求证:(1)AB
平面DEF ;
(2)BC⊥平面DEF .
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/13/c752dd6b-d635-4f34-8a55-144a142d71d0.png?resizew=131)
求证:(1)AB
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895d6f710d5f67e1d4c7408d50d77281.png)
(2)BC⊥平面DEF .
2020高三·江苏·专题练习 查看更多[1]
(已下线)预测03 空间向量与立体几何-【临门一脚】2020年高考数学三轮冲刺过关(江苏专用)
更新时间:2021-04-09 22:39:02
|
相似题推荐
解答题-证明题
|
较易
(0.85)
解题方法
【推荐1】如图,正方体
,棱长为4,
分别为
上的点,点
为
中点,且
.
![](https://img.xkw.com/dksih/QBM/2020/12/24/2621246615035904/2623745744273408/STEM/8d5cb1c5-518a-4978-b1a1-f962684be1dd.png)
(1)当
时,求证:
平面
;
(2)当
为何值时,三棱锥
的体积最大?,并求出最大值是多少.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3355e2fa0ac6c675f02ee36c3ced4f2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11ddc92d84d188c66b435664a7e7b5a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/582fca0c1348fbbf733909680affa238.png)
![](https://img.xkw.com/dksih/QBM/2020/12/24/2621246615035904/2623745744273408/STEM/8d5cb1c5-518a-4978-b1a1-f962684be1dd.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/707ea658f3a9359f5740d5aab48f7948.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d5d46cc6946821619e937d12d30dc83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/589c878e789e07e33d65c8a18cf2c58a.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e5a44046c8232c8b81924036c6ba9ed.png)
您最近一年使用:0次
解答题-证明题
|
较易
(0.85)
【推荐2】如图,四棱柱
的底面为菱形,
底面
,
,
,
,
分别为
,
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/3/b96b838d-6268-4279-b375-772a0d561b8e.png?resizew=172)
(Ⅰ)求证:
平面
;
(Ⅱ)求证:平面
平面
;
(Ⅲ)若
,求异面直线
与
所成角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5845ccc0d735dc14c92a8926d9b1def6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9eee296a7d9fba487f1485c61580196f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/3/b96b838d-6268-4279-b375-772a0d561b8e.png?resizew=172)
(Ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80e2f4fa50b5d6e843c2f54f3b44b836.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/503be2b7feae04f09c329dd3cd8ee58c.png)
(Ⅱ)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7c60a0de546f75b46348265746aa707.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bea124cef7ab3fd8069243e9894d1c59.png)
(Ⅲ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/962ddfa6a45e5588279c2a93f142924a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f1158eaa2e338f564eb18de5bef1d25.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
您最近一年使用:0次
解答题-问答题
|
较易
(0.85)
【推荐1】如图,在直三棱柱
中,
,
,
,
,点
为
的中点.
![](https://img.xkw.com/dksih/QBM/2021/5/19/2724641902116864/2724968976539648/STEM/e8e91571df974937b1ab8276b5d16891.png?resizew=172)
(1)求三棱锥
的体积.
(2)求直线
与平面
所成角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d70dc2c20619a4fc12a0cfda59af5b69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f08273d339dc5ddbb89aa67bb8205e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e55a2310cbba5e050488cd9296eb195d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/2021/5/19/2724641902116864/2724968976539648/STEM/e8e91571df974937b1ab8276b5d16891.png?resizew=172)
(1)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98bb4f21d1699d81097b3934ebc2acb9.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24bb49fdc6b6bbb2449fdf8a0de769d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58cc6184b191e6da43911e701121517e.png)
您最近一年使用:0次
解答题-证明题
|
较易
(0.85)
名校
【推荐2】如图,在四棱锥
中,底面ABCD为正方形,侧面PAD是正三角形,侧面
底面ABCD,M是PD的中点.
(1)求证:
平面PCD;
(2)求平面BPD与平面
夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93edc7bb513f40a89173121c8570cd65.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/15/efc9268a-8376-4dcb-8bd5-e226e5137906.png?resizew=140)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d0edb1508fc95765f3bb316bcb5252d.png)
(2)求平面BPD与平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
您最近一年使用:0次
解答题-问答题
|
较易
(0.85)
【推荐3】如图1,在Rt△ABC中,
,
,E,F都在AC上,且
,
,将△AEB,△CFG分别沿EB,FG折起,使得点A,C在点P处重合,得到四棱锥P-EFGB,如图2.
![](https://img.xkw.com/dksih/QBM/2022/5/11/2977249118150656/2977889031217152/STEM/92e7624e-cd8f-4bdc-a1ba-da9829cf5567.png?resizew=230)
(1)证明:
.
(2)若M为PB的中点,求钝二面角B-FM-E的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73cfddefc56eb020d2196def1dda947f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87011553442876e0b556fcc4febb5d3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67bcabd12049867fe7bb36dacdfd3bc4.png)
![](https://img.xkw.com/dksih/QBM/2022/5/11/2977249118150656/2977889031217152/STEM/92e7624e-cd8f-4bdc-a1ba-da9829cf5567.png?resizew=230)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a4a6a1e70241d600bc6c104313eac61.png)
(2)若M为PB的中点,求钝二面角B-FM-E的余弦值.
您最近一年使用:0次
解答题-证明题
|
较易
(0.85)
解题方法
【推荐1】如图,在四棱锥
,底面
为梯形,且
,
,等边三角形
所在的平面垂直于底面
,
.求证:
平面
;
![](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/e306e30d3159e4a68435c3fcfc8da693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5acb763021bf166ca719d07223591d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f90197a948331e61db644266368017e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2ffc6952e988d04f22f0fb2f7f0ab7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/5/07989db3-1ab5-4511-a1cf-27b66afa00cf.png?resizew=184)
您最近一年使用:0次
解答题-证明题
|
较易
(0.85)
【推荐2】已知四棱锥
中,
,
,
,
,
,面
面
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/12/c8fce1fa-01a5-405e-bb5c-c9e76dd2d851.png?resizew=189)
(1)求证:
;
(2)求面
与面
所成的二面角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80c753cb1eb73fd8d136d00462970797.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b6960dc549af25ed2360f3b483ad4c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30b0393ce62b24aa5f9b740d4cc6743b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a98c8e36238ad90378e724466fcb6023.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9c3ec174b1ce835cc8737ff6ce57e52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c4cb73e9d976cbfe9c590044fa69dd5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cf9a6db3571fa57bfa2d5e4d44c51b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c09afc70f448545336304333d5b5658b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67256a26af39663787c66ccd2809a5ff.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/12/c8fce1fa-01a5-405e-bb5c-c9e76dd2d851.png?resizew=189)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39ea1b19e6ab042da04c30907e1fabd0.png)
(2)求面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9a32bd7a1b78b5a0ec562c4025aea8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34be4e71cabf458f17a6cd7f24bc70af.png)
您最近一年使用:0次
解答题-证明题
|
较易
(0.85)
【推荐3】如图,在四棱锥
中,等边
所在的平面与正方形
所在的平面互相垂直,
为
的中点,
为
的中点,且
.
![](https://img.xkw.com/dksih/QBM/2016/6/27/1572835238879232/1572835244531712/STEM/9f3b857d90c4403ea768814e9f8f2d70.png?resizew=174)
(1)求证:
平面
;
(2)在线段
上是否存在点
,使线段
与
所在平面成
角,若存在,求出
的长,若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55a675310c8ba418e5a59beb7317e21e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://img.xkw.com/dksih/QBM/2016/6/27/1572835238879232/1572835244531712/STEM/9f3b857d90c4403ea768814e9f8f2d70.png?resizew=174)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3e126c16032892966489053f44b9048.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55a675310c8ba418e5a59beb7317e21e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
您最近一年使用:0次