在平行六面体
中,
,
,则
的长( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3da8c338342e38c9aa3f274c053fd5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/926720901aaadb0f4556caec51d3eeab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b735c72cfb59b24ec9c4aae288942252.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c92b5799d12ea37de46d7c942ce7a9.png)
A.10 | B.![]() | C.![]() | D.![]() |
更新时间:2023-10-17 23:36:53
|
相似题推荐
单选题
|
适中
(0.65)
名校
【推荐1】如图,四个棱长为
的正方体排成一个正四棱柱,
是一条侧棱,
,
分别是上下底面上其余的八个点,则下列说法正确的个数是( )
![](https://img.xkw.com/dksih/QBM/2021/1/5/2629473603403776/2632620019892224/STEM/5ecb3904-d033-423b-81e0-e00cb9919e58.png?resizew=346)
①
;
②
;
③
不同值的个数为
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59c709117ab1d3ef620883a732aed68b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fee2795f108d04b66cfb56e58b4cac62.png)
![](https://img.xkw.com/dksih/QBM/2021/1/5/2629473603403776/2632620019892224/STEM/5ecb3904-d033-423b-81e0-e00cb9919e58.png?resizew=346)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13612055af43aa6827039a9bf2cdac1e.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da4a59a78ac428796755b76037af023d.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94633cd1bd58a49ef1e316c64354d5b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】如图,已知正方体ABCD-A1B1C1D1的中心为O,则下列结论中
![](https://img.xkw.com/dksih/QBM/2022/7/12/3020929735180288/3021564578832384/STEM/3a2270953b134512883780dbde7ac389.png?resizew=152)
①
+
与
1+
1是一对相反向量;
②
-
1与
-
1是一对相反向量;
③
1+
1+
1+
1与
+
+
+
是一对相反向量;
④
-
与
1-
1是一对相反向量.
正确结论的个数为( )
![](https://img.xkw.com/dksih/QBM/2022/7/12/3020929735180288/3021564578832384/STEM/3a2270953b134512883780dbde7ac389.png?resizew=152)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d60dcb171bb7fd972aab8294d63acdb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0762365cf0afd8d6966d7d3407e2ade0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d60dcb171bb7fd972aab8294d63acdb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0762365cf0afd8d6966d7d3407e2ade0.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f68628a408537b1cf3bf1ca2a69731b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d20ec3efaa6b6ff5769e8999df5714a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d20ec3efaa6b6ff5769e8999df5714a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f68628a408537b1cf3bf1ca2a69731b6.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d60dcb171bb7fd972aab8294d63acdb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f68628a408537b1cf3bf1ca2a69731b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d20ec3efaa6b6ff5769e8999df5714a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0762365cf0afd8d6966d7d3407e2ade0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0762365cf0afd8d6966d7d3407e2ade0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d20ec3efaa6b6ff5769e8999df5714a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f68628a408537b1cf3bf1ca2a69731b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d60dcb171bb7fd972aab8294d63acdb3.png)
④
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d20ec3efaa6b6ff5769e8999df5714a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d60dcb171bb7fd972aab8294d63acdb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d20ec3efaa6b6ff5769e8999df5714a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d60dcb171bb7fd972aab8294d63acdb3.png)
正确结论的个数为( )
A.1 | B.2 | C.3 | D.4 |
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【推荐1】若正方体
表面上的动点
满足
,则动点
的轨迹为( )
![](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/4f07785c5a33db8ea1803b1f80c3dc1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
A.三段圆弧 | B.三条线段 |
C.椭圆的一部分和两段圆弧 | D.双曲线的一部分和两条线段 |
您最近一年使用:0次
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【推荐2】设
是空间不共面的四点,且满足
,
,
,则
是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c82a10b4f0c9323d726804c89dd9548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f97aef12d9f41ef87c7f35773f775c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/709220a94c3d90618274ecc29f93c2f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8402bac349cd19a3b8e5762117acb79c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b506b0941433a6a5d5387d0ec95596ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11d71379442f28c038d367d49422cf90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
A.钝角三角形 | B.锐角三角形 | C.直角三角形 | D.等边三角形 |
您最近一年使用:0次