名校
1 . 已知集合
{
,
},则
的真子集个数为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73f4b04c45b214ed061fe2a43f5b51ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c95b6be4554f03bf496092f1acdfbb89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2020-12-14更新
|
803次组卷
|
4卷引用:福建省普通高中2020-2021学年高二学业水平合格性考试(会考 )数学模拟试题(二)
解题方法
2 . 如图,在三棱锥
中,侧棱
底面
,
,
、
分别是棱
、
的中点.
![](https://img.xkw.com/dksih/QBM/2020/11/3/2585234825994240/2585584311795712/STEM/e82264977d5540d8b1b28ce973780d55.png?resizew=182)
(Ⅰ)证明:
平面
;
(Ⅱ)证明:
.
![](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/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://img.xkw.com/dksih/QBM/2020/11/3/2585234825994240/2585584311795712/STEM/e82264977d5540d8b1b28ce973780d55.png?resizew=182)
(Ⅰ)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57f9d682e5d3cc8573574d8d11636758.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
(Ⅱ)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58cc90fee532e50d319081d571410421.png)
您最近一年使用:0次
2020-11-04更新
|
306次组卷
|
2卷引用:青海省2021年12月普通高中学业水平考试数学试题
3 . 等比数列
中,若
是方程
的两根,则
的值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb1ef611373c17c7e42ed5cc2074cd72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec2efe3408c8d1ee8158ed01f6e997b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8db9fb61e388bd71f3671fb07e00e3aa.png)
A.6 | B.![]() | C.![]() | D.1 |
您最近一年使用:0次
2018-08-09更新
|
1287次组卷
|
3卷引用:云南省文山州砚山县第三高级中学2020-2021学年高二上学期学业水平模拟考试数学试题