名校
1 . 在长方体
中,
是
与
的交点,长方体体对角线
交截面
于点P.求证:
三点在同一条直线上.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c6151468904c32d230da58dca8193a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f919bd3dde10dbbc076f7ec5149699.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f1f229274a6e17977cc047814212589.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cfbc0b5a8fbde804bd8425a4b76d207.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ee8456443402a25b1e25d35ff7e1c98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fae7f4612c548b1f72a964ddb291cd2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6064fb6d03eeb1d190492e5384ea416c.png)
![](https://img.xkw.com/dksih/QBM/2018/6/26/1975741960478721/1977980573171712/STEM/b2b6fa10-d7f9-49b6-972e-045505b74ad2.png?resizew=197)
您最近一年使用:0次
解题方法
2 . 如图,在四棱柱
中,
平面
,
,
,
为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/10/e240a139-ff70-44c1-aadc-11cfe6d0f906.jpg?resizew=217)
(1)求四棱锥
的体积;
(2)求证:
;
(3)判断线段
上是否存在一点
(与点
不重合),使得
四点共面? (结论不要求证明)
![](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/0295a974ced04bd33310a6fd7d6a97d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4339a40ae9d1947ec3a4b3e2fa3a16cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/10/e240a139-ff70-44c1-aadc-11cfe6d0f906.jpg?resizew=217)
(1)求四棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49689db6053838426c8932826b9932a9.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/594bbb40a3dddaaf9ca6bb4c222b99e1.png)
(3)判断线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f6f93171329d508d491143b9d71f7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/709aaf1d58faa47361559d5ddc32a1b3.png)
您最近一年使用:0次
2018-01-19更新
|
600次组卷
|
2卷引用:北京市西城区2017— 2018学年度第一学期期末高二数学文科试题
12-13高二上·四川资阳·期末
解题方法
3 . 如图,已知平面
∩平面
=AB,PQ⊥
于Q,PC⊥
于C,CD⊥
于D.
![](https://img.xkw.com/dksih/QBM/2012/2/7/1570719944933376/1570719950356480/STEM/bc4b3ca615e34257a2e757ff2cd86cc1.png?resizew=127)
(1)求证:P、C、D、Q四点共面;
(2)求证:QD⊥AB.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://img.xkw.com/dksih/QBM/2012/2/7/1570719944933376/1570719950356480/STEM/bc4b3ca615e34257a2e757ff2cd86cc1.png?resizew=127)
(1)求证:P、C、D、Q四点共面;
(2)求证:QD⊥AB.
您最近一年使用:0次