名校
1 . 如图所示,在△ABC中,D,F分别是BC,AC的中点,
.
表示
;
(2)求证:B,E,F三点共线.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66303e9ef26067c6bdf2227649b0050e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8e8b95a61af300412fc65f846089028.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34e228086ff22bdd6829ab6c765e1d0e.png)
(2)求证:B,E,F三点共线.
您最近一年使用:0次
2023-04-03更新
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812次组卷
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6卷引用:广西钦州市浦北中学2022-2023学年高一下学期期中考试数学试题
2 . (1)已知非零向量
满足
,且
,求
与
的夹角
.
(2)四边形
为平行四边形,
,
,若点M,N满足
,
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64fa2fcefaf3d8868da0cb52877c5247.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bf70ea9d2b81767e13d4c8e1d3cbaba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4b7035d9fa54cd1a63dd005c0a33789.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/969604545902c9a66549a4a44ec3a3c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90ab17fd4247cdd710c363d5d3fbc5bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
(2)四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c36620cceac4f9a02d34cce46a58fcbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3aa9878611177b0f43276e6c47148f91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/467987dbc21f9f7686e062039c8e6a79.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d5745db6fd6db4ad02d45b0b3dbebac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc6b6bfca3525c3adbf2ba44e482008b.png)
您最近一年使用:0次
2020-02-02更新
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257次组卷
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3卷引用:【全国百强校】广西南宁市第三中学2018-2019学年高一下学期期中考试数学试题