正方体
的棱长为1,
、
、
分别是棱
、
、
的中点,下列结论正确的有( )
![](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/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f7ba05c54b3de1f4378f7c8eb58328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22adbc0da438220f9cace11b629d799b.png)
A.![]() ![]() |
B.![]() ![]() |
C.过![]() ![]() |
D.![]() ![]() ![]() |
更新时间:2021-07-15 13:20:51
|
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解题方法
【推荐1】直三棱柱
中,
分别为
,
的中点,点
是棱
上一动点,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8dfbab1e71852936206dfb76c891cb5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f7ba05c54b3de1f4378f7c8eb58328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fe06eea0107d3d2991dc2fa02fc93b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
A.对于棱![]() ![]() ![]() |
B.棱![]() ![]() ![]() ![]() |
C.对于棱![]() ![]() ![]() ![]() ![]() |
D.棱![]() ![]() ![]() |
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【推荐2】已知正方体
的棱长为
,点
分别棱楼
的中点,下列结论中正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/5/72782c69-c1f9-4773-bd10-8583f25d22da.png?resizew=199)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b199a99e53d67ff4abf233930961a29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/029ed096f249bfec4420d746e9a3d292.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/5/72782c69-c1f9-4773-bd10-8583f25d22da.png?resizew=199)
A.四面体![]() ![]() | B.![]() ![]() |
C.![]() ![]() | D.异面直线![]() ![]() ![]() |
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【推荐1】如图,矩形
中,
,
为边
的中点,将
沿
翻折成
,若
为线段
的中点,则在翻折过程中,下列结论中正确的是( )
![](https://img.xkw.com/dksih/QBM/2022/3/5/2929703925661696/2941037367992320/STEM/a4b3de90528948db983e8cb88af94662.png?resizew=212)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f80f51c31583fea58fde645474d60b8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3aa2a83fed9bf4cb09d84a980452e346.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ee8456443402a25b1e25d35ff7e1c98.png)
![](https://img.xkw.com/dksih/QBM/2022/3/5/2929703925661696/2941037367992320/STEM/a4b3de90528948db983e8cb88af94662.png?resizew=212)
A.四棱锥![]() ![]() |
B.翻折到某个位置,能使得![]() ![]() |
C.翻折到某个位置,能使得![]() |
D.点![]() |
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【推荐2】在棱长为1的正方体
中,已知E为线段
的中点,点F和点P分别满足
,
,其中
,则下列说法正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f6f93171329d508d491143b9d71f7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0971e9acef6d8d6553cdae7f9cd1569e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af7c4efac77a963ec845b7ef25cc7747.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86b69b8b87a5b3d45a6e369ffbc48c5c.png)
A.当λ=![]() |
B.当µ=![]() ![]() |
C.![]() ![]() |
D.存在唯一的实数对![]() |
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