定义:
,其中
为向量
与
的夹角,若
,则
等于__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/beff5658bb99c3427ea6a54a35d691f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb80eb942aafb194fadc473776f35b1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/433b94c39737727e53468df419d8314a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a556a50b517f2e2671f3d30157407058.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32351137d6f0cd292b3d765adfc983fc.png)
2012·福建福州·模拟预测 查看更多[4]
(已下线)2012届福建省福州市八中高三第五次质量检测文科数学(已下线)2013届福建省福清东张中学高三上学期期中考试文科数学试卷云南省红河州2017届高三毕业生复习统一检测数学(文)试题(已下线)压轴题平面向量与解三角形新定义题(九省联考第19题模式)练
更新时间:2019-01-30 18:14:09
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【推荐2】若
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7258cf333c26af488485b8b881ed8f0.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9bc052a11cf1a01445992672dde2836.png)
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【推荐1】已知
,
,
,则
与
的夹角为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd18461fd9d77e6fa46a654f0ab540f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/082c6926889f84f438ea35f70bf05f02.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb80eb942aafb194fadc473776f35b1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/433b94c39737727e53468df419d8314a.png)
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【推荐2】若
,
,
,则以
,
为邻边的平行四边形的面积是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bf185af29a2c9fd17cf163c47d7d975.png)
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【推荐1】定义
,若
,
,则与
方向相反的单位向量的坐标为______________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0b1fb27a959eae2820c7c294c349aed.png)
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【推荐2】如果向量
,
的夹角为
,我们就称
为向量
与
的“向量积”,
还是一个向量,它的长度为
,如果
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c10fa3fdbae7c582d8a4b5ae185e1cf6.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64c5562bd4d1b54424330cb6329cd79d.png)
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