已知正四棱柱
中,
,则异面直线
与
所成角的余弦值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6c5282bc1ea20767a6c092c22c761ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e26d9636ad77369535852c6e4493446a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83c09eec4e14a861af83d7828797d176.png)
A.![]() | B.![]() | C.![]() | D.![]() |
更新时间:2020-05-07 14:05:12
|
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【推荐1】如图,在直三棱柱
中,
,
,
是
的中一点,点
在
上,记
,若
平面
,则实数
的值为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/26/d8017777-3ed9-4c35-94ef-9152b37d3f31.png?resizew=160)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1baa3d0db9ad31d33c2883a6efed1dc7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11ddc92d84d188c66b435664a7e7b5a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fac85dd7dda624e1dc84b82347b6d136.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4560fa4ad459b58b723c74bd24e51ebf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/431e8bf1a5f9ac9a2ec82c11f31a4afe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/26/d8017777-3ed9-4c35-94ef-9152b37d3f31.png?resizew=160)
A.![]() | B.![]() | C.![]() | D.1 |
您最近一年使用:0次
单选题
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较易
(0.85)
【推荐2】在三棱柱
中,
平面ABC,
,M是
的中点,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5845ccc0d735dc14c92a8926d9b1def6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/405ce870a27b371014d1551ab093499d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f7ba05c54b3de1f4378f7c8eb58328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1039601edd7326b628a3201a3d4af948.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
单选题
|
较易
(0.85)
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解题方法
【推荐2】下图是正方体的平面展开图,在这个正方体中,下列判断不正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/15/3842a733-6b20-4a57-bd25-65cdb8a5693b.png?resizew=203)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/15/3842a733-6b20-4a57-bd25-65cdb8a5693b.png?resizew=203)
A.![]() | B.![]() |
C.![]() | D.直线![]() ![]() ![]() |
您最近一年使用:0次