名校
解题方法
1 . 如图,正方体
的棱长为1,
为
的中点,
为
的中点,则( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/24/9c52306f-c2bb-4bf0-b20c-255ff55bdc98.png?resizew=165)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff7ddbb49c644bf06ccbad885ba2c84a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/252053b853152bd294a8315debd00b92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/839dc642e9872ba4b29b8b21ff24bc0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/655b6a742dbacdab5aaa298007663dd4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbb16f7dbc4b9993c4efa0764df1d8ca.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/24/9c52306f-c2bb-4bf0-b20c-255ff55bdc98.png?resizew=165)
A.![]() | B.直线![]() ![]() |
C.直线![]() ![]() ![]() | D.点![]() ![]() ![]() |
您最近一年使用:0次
2022-10-22更新
|
727次组卷
|
6卷引用:贵州省黔东南州从江县第一民族中学2022-2023学年高二上学期期中质检测试数学试题
名校
解题方法
2 . 如图,在四棱锥
中,
底面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e468e01ce56dc6b21f3cbe123971ceb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/10/649686d0-e889-4bec-8084-80454f178480.png?resizew=261)
(1)若
在侧棱
上,且
,证明:
平面
;
(2)求平面
与平面
所成锐二面角的余弦值
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80c753cb1eb73fd8d136d00462970797.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f09ad78d4eccd1a9c9ccd3c4af79c79.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e468e01ce56dc6b21f3cbe123971ceb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/10/649686d0-e889-4bec-8084-80454f178480.png?resizew=261)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/945bc019f28b45c7bfd1337a3fb40771.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d46554105150391e671609fc6348a18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/500df0e782bb081e608f4bc1d576afcf.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9a32bd7a1b78b5a0ec562c4025aea8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/500df0e782bb081e608f4bc1d576afcf.png)
您最近一年使用:0次
2020-04-14更新
|
274次组卷
|
5卷引用:贵州省黔东南州黎平县黎平三中2019-2020学年高二下学期期末考试数学(理)试题
名校
3 . 如图,四边形
为正方形,
平面
,点
分别为
的中点,且
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/22/b86b3a25-f2b7-4f00-901f-679e6e6aa7ea.png?resizew=153)
(1)证明:
平面
;
(2)求二面角
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2682f3f3f0f72c893b99073bcac83ff2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8e2a44d05b1d387150c4b359e021ffc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87261df80b82221732329b6ef3fdda7f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/22/b86b3a25-f2b7-4f00-901f-679e6e6aa7ea.png?resizew=153)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a2b5cfae407016cad45bbdefea05833.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64eb31601464364be2baf4aa87404bcd.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b33b7213d99a817bff19bcf740a0697c.png)
您最近一年使用:0次
2020-03-19更新
|
169次组卷
|
2卷引用:贵州省凯里市第一中学2019-2020学年高二上学期半期数学试题
名校
解题方法
4 . 如图,四边形
为正方形,
平面
,点
分别为
的中点,且
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/23/0446923d-d92d-4010-a89c-cb6aec519298.png?resizew=141)
(1)证明:
平面
;
(2)求三棱锥
的体积与三棱锥
的体积之比.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2682f3f3f0f72c893b99073bcac83ff2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8e2a44d05b1d387150c4b359e021ffc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87261df80b82221732329b6ef3fdda7f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/23/0446923d-d92d-4010-a89c-cb6aec519298.png?resizew=141)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a2b5cfae407016cad45bbdefea05833.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64eb31601464364be2baf4aa87404bcd.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05479ce59da01ea9c5bef3f20efadb41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
您最近一年使用:0次
2020-03-19更新
|
234次组卷
|
2卷引用:贵州省凯里市第一中学2019-2020学年高二上学期半期数学试题
名校
解题方法
5 . 如图,过底面是矩形的四棱锥F-ABCD的顶点F作
,使AB=2EF,若平面
平面
,点G在CD上且满足DG=GC.求证:
![](https://img.xkw.com/dksih/QBM/2019/5/23/2209762042617856/2209871477399552/STEM/22dc2ab21c8b46a9b660e7e1db309776.png?resizew=120)
(1)
平面
;
(2)平面
平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb8df9fecaa0b266568ad35fb8f0e019.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a5628323a7eeb11213df5c9048b3543.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/2019/5/23/2209762042617856/2209871477399552/STEM/22dc2ab21c8b46a9b660e7e1db309776.png?resizew=120)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52aef9d1132740cff16178519f2e3d74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97a9b32570d553161be04d13954e92a1.png)
(2)平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/630675e0bd82419bc787b557181303d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d68ec6b93c40e26602f5de3ed9623f35.png)
您最近一年使用:0次
2017-12-26更新
|
840次组卷
|
7卷引用:贵州省凯里市第一中学2019-2020学年高二上学期开学考试数学试题
解题方法
6 . 在直三棱柱
中,
,延长
到
,使
,连结
,得到多面体![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78b1dd0fbfc62602b496a1ddce721d94.png)
![](https://img.xkw.com/dksih/QBM/2017/6/17/1711028883857408/1711595877466112/STEM/b75385fd5b734683a00b105e232b3249.png?resizew=227)
(1)证明:
平面
;
(2)若
,
,求平面
与平面
所成锐二面角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2ddd49625097d0a78df7170be4f882e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa265e6bf764ba99120bf8858fc29cc5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78b1dd0fbfc62602b496a1ddce721d94.png)
![](https://img.xkw.com/dksih/QBM/2017/6/17/1711028883857408/1711595877466112/STEM/b75385fd5b734683a00b105e232b3249.png?resizew=227)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/547a4b438e2e6687c7cd55ea08bbaae2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cee3d1518e197f7f25c341da6b1e3483.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8e1534947edbf652f61480a836f4123.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1baa3d0db9ad31d33c2883a6efed1dc7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cee3d1518e197f7f25c341da6b1e3483.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee8b5a6dbcf05f572f83f51abf7d668c.png)
您最近一年使用:0次
解题方法
7 . 如图所示,已知
平面
,
分别是
的中点,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/12/adca8942-87a7-4941-9c74-4688682f01e6.png?resizew=193)
(1)求证:
平面
;
(2)求证:平面
平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f9157fce2a8339d281178c7c0bccbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97bde5efa645a4c1ed6874088400d6a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bd6a2b112facda441f4e34bf5c145fa.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/12/adca8942-87a7-4941-9c74-4688682f01e6.png?resizew=193)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edcf19a7f0dd0cdf59516ae585025110.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
(2)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17580410bf63dba4fe164265afaac4cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
您最近一年使用:0次