名校
解题方法
1 . 已知正方体
,点
,
,
分别是线段
,
和
上的动点,观察直线
与
,
与
给出下列结论:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/1/c6dd710e-3db8-48fd-89a2-2e0f09bdc82a.png?resizew=143)
①对于任意给定的点
,存在点
,使得
;
②对于任意给定的点
,存在点
,使得
;
③对于任意给定的点
,存在点
,使得
;
④对于任意给定的点
,存在点
,使得
.
其中正确的结论是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1859959fdb4c5edd8056893f94a10a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ee8456443402a25b1e25d35ff7e1c98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d41164f8a9f6fe32a9364f18f168dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab56db50d7ace3d6ead190be9432e5ac.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/1/c6dd710e-3db8-48fd-89a2-2e0f09bdc82a.png?resizew=143)
①对于任意给定的点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08ded0c7bfe29be3c9757e20df65dd93.png)
②对于任意给定的点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d883886686e00e1e7a59998f1b0b610c.png)
③对于任意给定的点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/155d398cf0cdabae814b03785b2d5ea4.png)
④对于任意给定的点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4c8dc844e3a59c700067cef359bf6b8.png)
其中正确的结论是( )
A.① | B.②③ | C.①④ | D.②④ |
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名校
2 . 如图,在棱长为
的正方体
中,点
、
是棱
、
的中点,
是底面
上(含边界)一动点,满足
,则线段
长度的取值范围是
![](https://img.xkw.com/dksih/QBM/2018/4/2/1915314400256000/1915969983365120/STEM/8f00ceeec727493b9191f6873c6b8160.png?resizew=176)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.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/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bcaae059480972b077638672a303357.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d0ff310aabd2282b539537ebed3f788.png)
![](https://img.xkw.com/dksih/QBM/2018/4/2/1915314400256000/1915969983365120/STEM/8f00ceeec727493b9191f6873c6b8160.png?resizew=176)
A.![]() | B.![]() | C.![]() | D.![]() |
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