名校
解题方法
1 . 一个长方体的平面展开图及该长方体的直观图的示意图如图所示.
![](https://img.xkw.com/dksih/QBM/2021/12/19/2875651149111296/2878281717874688/STEM/06ec41e4-05e1-4a23-94df-6aca15af764f.png?resizew=363)
(1)请将字母F,G,H标记在长方体相应的顶点处(不需说明理由):
(2)若
且有下面两个条件:①
;②
,请选择其中一个条件,使得DF⊥平面
,并证明你的结论.
![](https://img.xkw.com/dksih/QBM/2021/12/19/2875651149111296/2878281717874688/STEM/06ec41e4-05e1-4a23-94df-6aca15af764f.png?resizew=363)
(1)请将字母F,G,H标记在长方体相应的顶点处(不需说明理由):
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/645c2acbf5a03068cba4d6dff6563976.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e4280be91682e5d8a0d0704190319bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faffe3765c15f53305516895aa595a9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73cc4309dcef077fbcf60099f47b7b37.png)
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2021-12-22更新
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172次组卷
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2卷引用:江西省安义中学等六校2021-2022学年高二上学期期末联考数学(理)试题