平行四边形
中,
,
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b321c815803dd623c491e180dcdc1cca.png)
_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abc28e69c1ba0aac981256887f7dfa94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60be92be108abb5da43c4505a580f859.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b41cd87c017d58870488dd6e1c1b68b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b321c815803dd623c491e180dcdc1cca.png)
更新时间:2018-02-12 08:59:04
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【推荐1】已知向量
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