1 . 如图所示,在四棱锥P-ABCD中,四边形ABCD为平行四边形,△PCD为正三角形,∠BAD=30°,AD=4,AB=2
,平面PCD⊥平面ABCD,E为PC中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/7/d9921a7f-cfff-401d-bbd4-a24e3f63ebf0.png?resizew=191)
(1)证明:BE⊥PC;
(2)求多面体PABED的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c3f8c3ba00c59e0634ed10fa85289de.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/7/d9921a7f-cfff-401d-bbd4-a24e3f63ebf0.png?resizew=191)
(1)证明:BE⊥PC;
(2)求多面体PABED的体积.
您最近一年使用:0次
2 . 在平行四边形
中,
过
点作
的垂线交
的延长线于点
,
.连结
交
于点
,如图1,将
沿
折起,使得点
到达点
的位置.如图2.
证明:直线![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
平面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3cdb19af3fe72be6542fb0d94f285b2.png)
若
为
的中点,
为
的中点,且平面
平面
求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc97c60d1d177f28113ea511a61d3931.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6166b9a5437671bcba31e17c375eb39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccaee8f228ff24e7c89879bb5b999cf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bf6c84731e5e1bd335ecfc2d36c3d81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1633988fd62a652de726ee92a917b52d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3cdb19af3fe72be6542fb0d94f285b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f53190d6ead827a6338b9de847aeaf1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16b77a5c3865855fbb3d24f9522ced8d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c707f0202ec1aa233e1eeacc7a4587d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48769011a648f0b274a3f1acb8531758.png)
![](https://img.xkw.com/dksih/QBM/2019/4/3/2174654959190016/2175408525426688/STEM/9a1066c8-fe22-4924-988d-24a33cc08c70.png)
您最近一年使用:0次
2019-04-04更新
|
912次组卷
|
8卷引用:甘肃省敦煌市2021届高三三模数学(文)试题
3 . 如图,在五面体
中,底面
为矩形,
,
,过
的平面交棱
于
,交棱
于
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/19/1b8f7ed2-8963-41b9-a5b1-e88d618e56c7.png?resizew=155)
(1)证明:
平面
;
(2)若
,
,
,求五面体
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59e89556992cbfd7043330ac7421d342.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/058f36d315245b63a811d5c6f348c17b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d0085ee46fbc2a1d3bd98aec14cd8b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00bab17635a999236e8d2e35017a208d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12a477603f3f88c3b48352b6130f9ad5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/19/1b8f7ed2-8963-41b9-a5b1-e88d618e56c7.png?resizew=155)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72221ee5b504d596ff799c0b356aa0ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0a0d2a2415ec1e1374ac46bc232f450.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65ac8eb186c7f68ee35608b306eca420.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee69d2552bd48ff07358fe40f23127de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59e89556992cbfd7043330ac7421d342.png)
您最近一年使用:0次
2019-01-14更新
|
506次组卷
|
2卷引用:【市级联考】甘肃省张掖市2019届高三上学期第一次联考数学(文)试题
4 . 在多面体
中,平面
平面
为正三角形,
为
中点,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/2/3d2b5f64-137a-4693-aaa4-a8e8b7ff6752.png?resizew=170)
(1)求证:平面
平面
;
(2)求多面体
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7281fb299ccf1adfb9de560fd0984edb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7a65c950688c55e609dff49bce02eaa.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/064c8383c0492e98401c169893612214.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/2/3d2b5f64-137a-4693-aaa4-a8e8b7ff6752.png?resizew=170)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b8f3dd6c6f43d594d10735338e6a2f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
(2)求多面体
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7281fb299ccf1adfb9de560fd0984edb.png)
您最近一年使用:0次
2018-04-20更新
|
774次组卷
|
4卷引用:甘肃省天水市第一中学2017-2018学年度下学期高三第二次模拟 考试 数学(文科)试题