1 . 如图,在三棱台
中,
平面
,
,
,
分别为
,
的中点
.![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/6/05b0716e-21a7-4b1f-8dbe-3266420fc207.png?resizew=240)
(1)求证:
平面
;
(2)若
且
,求二面角
的大小.
![](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/255791e63a0cf4f5e156319fae423769.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/6/05b0716e-21a7-4b1f-8dbe-3266420fc207.png?resizew=240)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1496afecd92a619fbe5e9b736f06f4e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eae80f09dae8acbe1e5e27bd5c4d8164.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3570a95f68349fcd9417fcda62e78e7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b0e6a4fae0cf7bf0e6bbd925318d3e.png)
您最近一年使用:0次
2017-02-08更新
|
1728次组卷
|
3卷引用:2017届广西玉林市、贵港市高三毕业班质量检测数学(理)试卷
解题方法
2 . 如图,在四棱锥
中,已知.
,
,
,点
是
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/7/1f219d8d-1270-4a19-9265-fbb72e9100db.png?resizew=187)
(1)证明:
平面
;
(2)求四面体
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6a216ccd72c008c01053d2db53451c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9060f03b9ee41d70d135b1e1a8902ce9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44954ffd79b7384b0efd6f014abfe147.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/7/1f219d8d-1270-4a19-9265-fbb72e9100db.png?resizew=187)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5865d488a9cf1181016fd2e866177cdd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
(2)求四面体
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1613c53d8e5f8161b92727232e67b662.png)
您最近一年使用:0次
3 . 如图,在四棱锥
中,已知
,点
是
的中点.
![](https://img.xkw.com/dksih/QBM/2016/11/9/1573137495523328/1573137501872128/STEM/2932359e805e48b29b99f2b573432d26.png?resizew=199)
(1)证明:
平面
;
(2)求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/798820c796c5d048613f471f183dedf1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://img.xkw.com/dksih/QBM/2016/11/9/1573137495523328/1573137501872128/STEM/2932359e805e48b29b99f2b573432d26.png?resizew=199)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e0684e0b09b04661c602437982c0397.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/218054144a13435580cd132b9459546c.png)
您最近一年使用:0次
4 . 如图,已知四棱锥
中,底面
为菱形,且
,
是边长为
的正三角形,且平面
平面
,已知点
是
的中点.
![](https://img.xkw.com/dksih/QBM/2016/11/25/1573180774187008/1573180780601344/STEM/2bee746e-3f3a-40b2-a740-b11cbdc2a04a.png?resizew=241)
(1)证明:
平面
;
(2)求直线
与平面
所成角的正弦值.
![](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/48b7f92d9ab08250f5050e0b8122aea1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/703b40a6293ed9e33001e2919379b168.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4aa9084b8fe0fe05c4388d1f835587b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://img.xkw.com/dksih/QBM/2016/11/25/1573180774187008/1573180780601344/STEM/2bee746e-3f3a-40b2-a740-b11cbdc2a04a.png?resizew=241)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30067b7b236d17af8a462f96a58d11bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53bdef2e7a7929ad6190302ab44c46c0.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53bdef2e7a7929ad6190302ab44c46c0.png)
您最近一年使用:0次
2016-12-05更新
|
1049次组卷
|
3卷引用:2017届广西梧州高三上摸底联考理数试卷
解题方法
5 . 如图,已知四棱锥
,
∥
,
,
平面
,
为
中点.
![](https://img.xkw.com/dksih/QBM/2016/1/19/1572444639739904/1572444645933056/STEM/a4a75c7b82994bfd87c77287ca443c15.png?resizew=200)
(1)求证:
∥平面
;
(2)求证:平面
平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e11494dd6caef4610597fbb1511a7fcd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6530368eaa6f536bde179a377fd9db9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://img.xkw.com/dksih/QBM/2016/1/19/1572444639739904/1572444645933056/STEM/a4a75c7b82994bfd87c77287ca443c15.png?resizew=200)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
(2)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16b77a5c3865855fbb3d24f9522ced8d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/218054144a13435580cd132b9459546c.png)
您最近一年使用:0次
6 . 如图,DA⊥平面ABC,DA∥PC,∠ACB=90°,AC=AD=BC=1,PC=2,E为PB的中点.
![](https://img.xkw.com/dksih/QBM/2015/3/27/1572039932092416/1572039937966080/STEM/49fcc111cbd641afa4151c6dc620b7c5.png?resizew=136)
(1)求证:DE∥平面ABC;
(2)求二面角E﹣CD﹣B的余弦值.
![](https://img.xkw.com/dksih/QBM/2015/3/27/1572039932092416/1572039937966080/STEM/49fcc111cbd641afa4151c6dc620b7c5.png?resizew=136)
(1)求证:DE∥平面ABC;
(2)求二面角E﹣CD﹣B的余弦值.
您最近一年使用:0次
7 . 如图,在三棱柱
中,侧棱垂直于底面,
分别是
的中点.
(1)求证: 平面
平面
;
(2)求证:
平面
;
(3)求三棱锥
体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d646c02963c2bdf9b75686ba19e87a91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61ea285e96bf2e3b6406151bb694f10a.png)
(1)求证: 平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed5f0cfc1049f84a04c81bd213afb8d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f96c673a2381f118ea2d3efc0bca1f3.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3af12a8e26c1373c5a00e2011d3c613a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c09afc70f448545336304333d5b5658b.png)
(3)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51f73a0ca4e6c794242489066fddb6c5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/9/7bc75e06-eaf5-400f-bd96-6146a5f0ee75.png?resizew=135)
您最近一年使用:0次
2016-12-03更新
|
6517次组卷
|
29卷引用:2015届广西桂林第十八中高三上学期第二次月考文科数学试卷
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