已知非零向量
,
,
满足
,
,
的夹角为120°,且
,则向量
,
的数量积为______________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64c5562bd4d1b54424330cb6329cd79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b45ba716f03748c19b7ce2f99af536ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73a0b19e69be46452425916a0fcb49c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e60956920410e35d6d1d24cd61bd986.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64c5562bd4d1b54424330cb6329cd79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b45ba716f03748c19b7ce2f99af536ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/241ba9f7e7c26724fd750ff04df1be6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64c5562bd4d1b54424330cb6329cd79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73a0b19e69be46452425916a0fcb49c9.png)
更新时间:2023-03-19 16:29:42
|
相似题推荐
填空题-单空题
|
适中
(0.65)
解题方法
【推荐1】在
中,
,
是
上一点,
,且
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee38ef0189000b6f1bee0a046ff4b091.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41ed27b4d16563011f039961118d103c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3f157aab917082b835f4213ed81a3bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7177ee1ade4d50c57a9b8a0402c76692.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee38ef0189000b6f1bee0a046ff4b091.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/9/e6a8a8f3-8f3b-43e4-9a68-f6cc582521ef.png?resizew=172)
您最近一年使用:0次
填空题-双空题
|
适中
(0.65)
名校
解题方法
【推荐2】如图,在菱形
中,
,
分别是边
上的点,且
,
,连接
,交点为
.设
,
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/21/7336abe6-da22-4352-b0ba-3b1a93626b6d.png?resizew=147)
则(1)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/825116eb345f5505ebc8c1cdb8a1f131.png)
_____ ;
(2)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4d41c6be049793f507f5cf7bd81736a.png)
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f945a69cf7e8213e50622125cde652f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/374fe9986ebbc986fc422e514ab93a51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aae7d93ef90564a5ca9d9a79a74245f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1edf07a2e8006fc9446a1bac93f3324c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8dacef6b500fbbea1dbc6a1b0acb43ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8279e2f4f69e2709bf8d87b485bd67b0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/21/7336abe6-da22-4352-b0ba-3b1a93626b6d.png?resizew=147)
则(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/825116eb345f5505ebc8c1cdb8a1f131.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4d41c6be049793f507f5cf7bd81736a.png)
您最近一年使用:0次
填空题-单空题
|
适中
(0.65)
【推荐1】在
中,给出如下命题:
①
是
所在平面内一定点,动点
满足
,
,则动点
的轨迹一定过
的重心.
②
是
所在平面内一定点,动点
满足
,
,则动点
的轨迹一定过
的内心.
③
是
所在平面内一定点,且![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90ae7eb72968a4ccf1a5153c84068fe9.png)
,则
.
(4)若
,且![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5211e0e67b9ec739dbf0566f79256edb.png)
,则
是等边三角形.
其中正确的命题有______ 个.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cbf7be8ba716bd4b67a2bce6e7379f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a482f7c5ad38fd95892bdb75fa002c9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/783b6a7dd6c37b27bb42aa8d85250945.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a482f7c5ad38fd95892bdb75fa002c9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90ae7eb72968a4ccf1a5153c84068fe9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6322c58639006dd6852a48a45da50167.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2011e8eb30a052f682e70ee01b383dfe.png)
(4)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/771c53918591328292bf8d8b33e5e3d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5211e0e67b9ec739dbf0566f79256edb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
其中正确的命题有
您最近一年使用:0次
填空题-单空题
|
适中
(0.65)
名校
【推荐2】如图,在
中,已知
,点
是边
的中点,且
,直线
与
相交于点
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/645ce289c7cd2c004a200cfe5372d36b.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69e35f4432b823923dd603a90fe13acb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cf70da2bef86711835648ec4ef8ec5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7785afeeaf274892253d04b4f693b367.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/645ce289c7cd2c004a200cfe5372d36b.png)
您最近一年使用:0次