如图,已知
平面
,
,
,
且
是
的中点,
.
![](https://img.xkw.com/dksih/QBM/2017/12/7/1833520643481600/1839563489927168/STEM/7f0fe37cfcd54a3bb32e2bd53201e386.png?resizew=228)
(1)求证:
平面
;
(2)求证:平面
平面
;
(3)求此多面体的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f9157fce2a8339d281178c7c0bccbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4eb7e9ad5486cf1c5e506b20c5469e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0137c721b8d4ea6dca8b7d9761134726.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d56fc73da0ba166964ef8f37be9a001.png)
且
![](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/2f414cce1427646590a7f7144efe2e26.png)
![](https://img.xkw.com/dksih/QBM/2017/12/7/1833520643481600/1839563489927168/STEM/7f0fe37cfcd54a3bb32e2bd53201e386.png?resizew=228)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dcafa398cc6b6079883e7ad153eb62d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/500df0e782bb081e608f4bc1d576afcf.png)
(2)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39282bdf319f30d7bc261e2e3ab3b1e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10fc7991ea17d54ff5f4445ac5699463.png)
(3)求此多面体的体积.
10-11高三·福建·期中 查看更多[7]
(已下线)2012届福建省四地六校高三期中联考文科数学试卷(已下线)2014届广东省东莞市高三第二次模拟考试文科数学试卷(已下线)2015届江西省红色六校高三第一次联考文科数学试卷2015届甘肃省天水市一中高三5月中旬仿真考试文科数学试卷广东省广州市2017-2018学年高二上学期学业水平测模拟B数学试题河北省保定市2018届高三下学期第二次模拟数学(文)试题山西省运城市景胜中学2020-2021学年高二上学期9月适应性测试数学试题
更新时间:2017-12-16 10:24:24
|
相似题推荐
解答题-证明题
|
适中
(0.65)
名校
解题方法
【推荐1】如图,在四棱台
中,
,四边形
和
都是正方形,
平面
,点
为棱
的中点
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/5/97602b6e-b705-45a3-8b7f-19d28b86eeb9.jpg?resizew=158)
(1)求证:
平面
;
(2)求平面
与平面
所成角的余弦值;
(3)求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed90951b78679d7296aaa48533de2238.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632f2bf1cd0435041fa04b01901d1c8c.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/5/97602b6e-b705-45a3-8b7f-19d28b86eeb9.jpg?resizew=158)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a68a149f25a0f717d64d9fbeaac40d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9edc50f7febbc2d5d8dcdc23a3630a7.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/657dffbd3623b705f871878fbd9df57e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(3)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68810418922056adb838462f125dc403.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐2】如图, 四棱锥
中, 平面
平面
,
为线段
上一点,
为
的中点.
![](https://img.xkw.com/dksih/QBM/2016/11/7/1573129251553280/1573129257713664/STEM/d635066d95ac48eca31eab68b2216369.png)
(1)证明:
平面
;
(2)求二面角
的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6153163fecdf3f410411048428ccaef5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3321ddb3483d7576d719d5b929f9bd87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39c0cf9f1ae39da39e324d749ca8964e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a9da9d87cbd86bb169d0e984f67ea8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://img.xkw.com/dksih/QBM/2016/11/7/1573129251553280/1573129257713664/STEM/d635066d95ac48eca31eab68b2216369.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32695b446526cf8b689cf8c5d3217520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4734735213b599a9915e1ed91a5d8ce4.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/249c841f2d649424b8a019055da7e0c8.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐3】如图,
是边长为3的正方形,
平面
,
,且
,
.
![](https://img.xkw.com/dksih/QBM/2018/5/8/1940736829652992/1941726505476096/STEM/6b185fc5a332403d93d45b854e78770e.png?resizew=215)
(1)试在线段
上确定一点
的位置,使得
平面
;
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70f64d50d6201578310ad33c10a1d323.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8139d9fd5c670c91aa7dc485366dd1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b995b80185528896eb4a85d58b5701ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ee7e32aecedb438b49bf03b2b8e524c.png)
![](https://img.xkw.com/dksih/QBM/2018/5/8/1940736829652992/1941726505476096/STEM/6b185fc5a332403d93d45b854e78770e.png?resizew=215)
(1)试在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00a28be4d5a16cf245f6fa7c4088fee4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f33fa5152ba27f7b8a28890cefca219.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87c0bfeadcf17b2a45896071f07a4a5a.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb1ee4a37c047f36487649d1fe157b1c.png)
您最近一年使用:0次
【推荐1】如图,在长方体
中,
,
,
是
的中点,
是底面
上的动点,且满足
.
![](https://img.xkw.com/dksih/QBM/2021/5/2/2712442643783680/2720936797421568/STEM/4eb2e2a6-8d59-4ae1-ba9e-ad93b5c0604a.png?resizew=268)
(1)求证:平面
平面
;
(2)当
时,求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6155f82a6f64b20085976cea9b64193.png)
![](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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632f2bf1cd0435041fa04b01901d1c8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/187ed13a7bd532bd39af5e5ad7493a2c.png)
![](https://img.xkw.com/dksih/QBM/2021/5/2/2712442643783680/2720936797421568/STEM/4eb2e2a6-8d59-4ae1-ba9e-ad93b5c0604a.png?resizew=268)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6501f1c913a4ef64957a2f01ab5baa15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2e59617707e98c3441445392333b491.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87c0bfeadcf17b2a45896071f07a4a5a.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】如图,在三棱锥
中,
.
![](https://img.xkw.com/dksih/QBM/2016/9/8/1573006592401408/1573006598782976/STEM/19ef250eef2241928029ec4b1fa4aa06.png)
(1)求证:平面
平面
;
(2)若
,当三棱锥
的体积最大时,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bd35d0f4870f1a741ed46baa908019c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aabd1b4d2d98c3fe775aaa3287b46df4.png)
![](https://img.xkw.com/dksih/QBM/2016/9/8/1573006592401408/1573006598782976/STEM/19ef250eef2241928029ec4b1fa4aa06.png)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6975ec118f40dc2feb16fb2dcde3285c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94694a26bc9ebf5e1ec65302b4f980a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bd35d0f4870f1a741ed46baa908019c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
您最近一年使用:0次