名校
1 . 已知
,现有如下四个结论:①
;②四边形
为平行四边形;③
与
夹角的余弦值为
,④
;则上述正确结论的序号为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/247c94145088c4394ee2dc8ae1672b3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a4145c0fc69cd40771b078e6b732336.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c436b63e793d6d39990341d29cf47f10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11d86ed5700cde027ca83174d9c10292.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c516c60100e3db9550f6767948bf8da0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee0f781e0ca377ddc99ac101ddc4907b.png)
A.①③ | B.②④ | C.①④ | D.②③ |
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2019-10-22更新
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3卷引用:陕西省(全国II卷)百校联盟2019-2020学年高三上学期TOP20九月联考数学(理)试题
解题方法
2 . 已知平面向量
,下列说法中:
①
;②
;③向量
与
的夹角为
;④向量
在
上的投影向量为
,
正确说法的序号是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3aab5c8b113202ecc3944500fe5e324b.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44a706c0068d39e0dc168c3c4f3b84da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3714ae4035d7a651ffcbb98b01978837.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed492f7b29166ba5c1f0023b05a439c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64c5562bd4d1b54424330cb6329cd79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed492f7b29166ba5c1f0023b05a439c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64c5562bd4d1b54424330cb6329cd79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2efe36b7c93fbd8dc63d5d1be81b8250.png)
正确说法的序号是( )
A.①② | B.①③ | C.②③ | D.②④ |
您最近一年使用:0次
2022-11-10更新
|
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2卷引用:天津市南开区2022-2023学年高三上学期11月阶段性质量监测(一)数学试题