解题方法
1 . 如图,正方体
的棱长为1,线段
上有两个动点
,且
,则下列结论中错误的个数是
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/6/1413ad1a-5bc0-40be-8548-a3792a5ba427.png?resizew=201)
(1)
;
(2)若
为
上的一点,则
到平面
的距离为
;
(3) 三棱锥
的体积为定值;
(4) 在空间与三条直线
都相交的直线有无数条.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cfbc0b5a8fbde804bd8425a4b76d207.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a373959bb9026f8a09845c0b828bf82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e438a162ed349f7f25333e8f6c044e6d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/6/1413ad1a-5bc0-40be-8548-a3792a5ba427.png?resizew=201)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/589ddae20626f9aaac616d2a3b5d95bd.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87c0bfeadcf17b2a45896071f07a4a5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d5989c84e320b504511f23eeb6e7357.png)
(3) 三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccc3bf74119692ac98eb24fcfa2a3f9f.png)
(4) 在空间与三条直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43851c41839f871e32d2536243ac4218.png)
A.0 | B.1 | C.2 | D.3 |
您最近一年使用:0次
12-13高一下·福建泉州·期中
名校
解题方法
2 . 在棱长为2的正方体
中,设
是棱
的中点.
![](https://img.xkw.com/dksih/QBM/2016/1/22/1572463120384000/1572463126601728/STEM/b261c2a114f64023a43604a8fe4bd7c3.png)
(1)求证:
;
(2)求证:
平面
;
(3)求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8456cee87c4e22351affc28f3a73a0f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://img.xkw.com/dksih/QBM/2016/1/22/1572463120384000/1572463126601728/STEM/b261c2a114f64023a43604a8fe4bd7c3.png)
(1)求证:
![](https://img.xkw.com/dksih/QBM/2016/1/22/1572463120384000/1572463126601728/STEM/e8df690d015c428ea85917ae2effe863.png)
(2)求证:
![](https://img.xkw.com/dksih/QBM/2016/1/22/1572463120384000/1572463126601728/STEM/53d0f90315494da8b660dbbb13817524.png)
![](https://img.xkw.com/dksih/QBM/2016/1/22/1572463120384000/1572463126601728/STEM/5e7657b5d6e2406a957594c9308d8a37.png)
(3)求三棱锥
![](https://img.xkw.com/dksih/QBM/2016/1/22/1572463120384000/1572463126601728/STEM/8a9694cfebb54860b9a6fa9a125e78b9.png)
您最近一年使用:0次
2016-12-04更新
|
576次组卷
|
7卷引用:2014-2015学年湖北长阳县第一高中高二上学期期中考试理科数学试卷
10-11高二下·湖北宜昌·期中
解题方法
3 . 【卷号】1570133485240320
【题号】1570133490401280
3 .
已知线段
面
,
,
,
面
于点
,
,且
在平面
的同侧,若
,则
的长为________ .
【题号】1570133490401280
3 .
已知线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f9157fce2a8339d281178c7c0bccbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aca1220cac88301a48ee05139cf1b1d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7aa1162d5481e2441fe5bc0d49a576b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1e0bd4b30dc777ac9da80f6baa3eb31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a092b45898579d7f9d55a391a325a870.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47c822b937cd74424c1025e52a6cd973.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/625bca170fed3fbdc1441b3c0df4a6bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
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