如图
,在三棱锥
中,
平面
,
,
为侧棱
上一点,它的正(主)视图和侧(左)视图如图
所示.
(
)证明:
平面
.
(
)求三棱锥
的体积.
(
)在
的平分线上确定一点
,使得
平面
,并求此时
的长.
![](https://img.xkw.com/dksih/QBM/2017/11/3/1809219848675328/1809934050557952/STEM/6ef207b0e144411795bfccdf8bb1b3d1.png?resizew=133)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/615fc8790237a1b09af51d6bcad6b595.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca5dd496ee0c1170ef6dcc48266ee444.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4357d5744046d4d44abb09e1ee35fcb.png)
(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7e258c6995b058164df335e154692b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7abd284f76d9f5769bc189508ce2572b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://img.xkw.com/dksih/QBM/2017/11/3/1809219848675328/1809934050557952/STEM/6ef207b0e144411795bfccdf8bb1b3d1.png?resizew=133)
![](https://img.xkw.com/dksih/QBM/2017/11/3/1809219848675328/1809934050557952/STEM/1041d663056042889cc4a4a01e46ed8a.png?resizew=234)
12-13高二上·黑龙江大庆·开学考试 查看更多[8]
(已下线)2012-2013学年黑龙江大庆实验中学高二上学期开学考试文科数学试卷(已下线)2012-2013学年湖北武汉部分重点中学高二上学期期末考试文科数学卷(已下线)2012-2013学年广东省揭阳一中高一下学期第一次段考文科数学试卷北京市海淀清华附永丰学校2016-2017学年高二上学期期中考试数学试题(已下线)专题46 空间向量与立体几何大题解题模板-2021年高考一轮数学单元复习一遍过(新高考地区专用)(已下线)专题46 空间向量与立体几何大题解题模板-2021年高考一轮数学(理)单元复习一遍过(已下线)专题43 立体几何大题解题模板-2021年高考一轮数学(文)单元复习一遍过(已下线)专题03 立体几何大题解题模板-(新教材)2020-2021学年高二数学单元复习(人教A版选择性必修第一册)
更新时间:2016-12-02 00:59:09
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【推荐1】如图所示,在平面直角坐标系中,各点坐标分别为O(0,0),A(1,3),B(3,1),C(4,6),D(2,5)试用斜二测画法画出四边形
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【推荐2】某高速公路收费站入口处的安全标识墩如图4所示,墩的上半部分是正四棱锥P-EFGH,下半部分是长方体ABCD-EFGH.图5、图6分别是该标识墩的正(主)视图和俯视图.
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解答题-问答题
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名校
【推荐1】在四棱锥
中,底面
是边长为
的正方形,
平面
,
.
![](https://img.xkw.com/dksih/QBM/2018/5/21/1950115284877312/1952334514069504/STEM/3d58b883d6fe495ca296c22544f3e57c.png?resizew=149)
(1)求四棱锥
的体积;
(2)求异面直线
与
所成角的大小.
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a1b49f64e0065edad868b25e9fcada3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f566f6d9d8820c075a48eca82815de72.png)
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(1)求四棱锥
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(2)求异面直线
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解答题-证明题
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适中
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解题方法
【推荐2】已知四棱锥
中,
,侧面
底面ABCD,E,F分别为PC,CD的中点.
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(1)设点Q为BE上的动点,求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632917e61f4208959686d118c7f19231.png)
平面PAD;
(2)设Q为线段BE上靠近E的一个三等分点,求三棱锥P-BFQ的体积.
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(2)设Q为线段BE上靠近E的一个三等分点,求三棱锥P-BFQ的体积.
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解答题-证明题
|
适中
(0.64)
【推荐1】如图所示,异面直线
互相垂直,
,
,
,
,
,截面
分别与
相交于点
,且
平面
,
平面
.
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(1)求证:
平面
;
(2)求二面角
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解答题-证明题
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适中
(0.65)
名校
解题方法
【推荐2】如图,在三棱柱
中,侧面
是矩形,平面
平面
,
是棱
的中点.
,
.
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(1)求证:
;
(2)若
是
的中点,求证:
平面
.
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(2)若
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