在四面体
中,
,D为
的三等分点(靠近B点),E为
的中点,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4278c0911e7df78965e78cff69cac5f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/352afb2166bc2d282d55bd7bba4388e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/398c5d7b6ff455e94a78034670a3eeca.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
更新时间:2024-05-26 16:40:53
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【推荐1】如图,在四面体OABC中,M是棱OA上靠近点A的三等分点,N,P分别是BC,MN的中点.设
,
,
,则向量
可表示为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/3/94e05a14-7bb8-40a8-a677-37007e81cc41.png?resizew=205)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14390e9b6b44472bdc7a131133ab39b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87cd14dfc0024459f9d8e594c95c5106.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e07dcf0b16163e0e0e0c0f248466ee7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91174b2336306191ba275a87864172b7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/3/94e05a14-7bb8-40a8-a677-37007e81cc41.png?resizew=205)
A.![]() | B.![]() |
C.![]() | D.![]() |
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【推荐2】如图所示,在长方体
中,下列各式运算结果为向量
的是( ).
①
; ②
;
③
; ④
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/8/9d8f7ebe-e670-47db-a846-582d8003f8af.png?resizew=134)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/578effa4621f469c53ad9f23649498d9.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43a8b3d5e2f59ea2a997caa01f32dc29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09fae3efd8145c87ad2c7fe4fa8da652.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfdb1142b6629da0c2d6d3a256676163.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f207ff222929c7243c282c670f30b78f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/8/9d8f7ebe-e670-47db-a846-582d8003f8af.png?resizew=134)
A.①② | B.②③ | C.③④ | D.①④ |
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【推荐1】在三棱柱
中,
,
,
.点
在棱
上,且
,
为
的中点,若以
为基底,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f3adc4ed291596abf3bb93ae7a075d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cc03a3ba496faee748a8d63e5d4fa92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8780f5b68f8907a57c1c2f96233a78c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5aa9c3b0d19ae046b55ca748249969a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e12e95f703ad30ab9a3d38376830989.png)
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A.![]() | B.![]() |
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【推荐2】如图,在平行六面体
中,M在AC上,且
,N在
上,且
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,
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3874cfb92230922f405524750c7c61e.png)
![](https://img.xkw.com/dksih/QBM/2020/11/10/2589748686880768/2600847365521408/STEM/f217867fb4024e89821123def2531e65.png?resizew=239)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a44a918c7cfd942d3a53e584c26685a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1f4aa55c2b5bd71b449222baf6effad.png)
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