(1)已知非零向量
,求作向量
,使
;
(2)(1)中表示
的有向线段能构成三角形吗?说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec087ac9322b662a41e6efa997b31c71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45d8e782e9687f2e6276a8541ff8dcf7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/475c8e8da15e4a7b597e157743a4a3b4.png)
(2)(1)中表示
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/169973c371fa1fcd19f1afb01b0c0b76.png)
更新时间:2024-05-26 10:28:45
|
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解答题-问答题
|
容易
(0.94)
解题方法
【推荐2】如图,已知向量
、
、
、
、
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/8/cf04fc57-b5c3-462a-a19f-6f1242ee3f9c.png?resizew=148)
(1)用
、
、
表示
;
(2)用
、
表示
;
(3)用
、
、
表示
;
(4)用
、
表示
.
![](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/7b76118bdca6c463cfb19b66f30281c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c984376f5475184e0d3e4f7e1bb65f76.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/8/cf04fc57-b5c3-462a-a19f-6f1242ee3f9c.png?resizew=148)
(1)用
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64c5562bd4d1b54424330cb6329cd79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b76118bdca6c463cfb19b66f30281c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c984376f5475184e0d3e4f7e1bb65f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dc3c7d64ba3f82cb0853d6f674a1f44.png)
(2)用
![](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/1dc3c7d64ba3f82cb0853d6f674a1f44.png)
(3)用
![](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/c984376f5475184e0d3e4f7e1bb65f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a102a0887fac660aba1f8124e7ee363.png)
(4)用
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73a0b19e69be46452425916a0fcb49c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b76118bdca6c463cfb19b66f30281c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a102a0887fac660aba1f8124e7ee363.png)
您最近一年使用:0次
解答题-问答题
|
容易
(0.94)
【推荐1】如图所示,在任意四边形ABCD中,E为AD的中点,F为BC的中点.请探究向量
与向量
是否平行,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3752ec3a2effe33990087fc499a4eeb6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae54940f33b8714da5fe3b7546f8b3dc.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/13/b3faecf7-0d3e-46e0-81ba-49da5bd7b835.png?resizew=171)
您最近一年使用:0次
解答题-问答题
|
容易
(0.94)
解题方法
【推荐2】如图所示,∠AOB=∠BOC=120°,|
|=|
|=|
|,求
+
+
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d60dcb171bb7fd972aab8294d63acdb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f68628a408537b1cf3bf1ca2a69731b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d20ec3efaa6b6ff5769e8999df5714a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d60dcb171bb7fd972aab8294d63acdb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f68628a408537b1cf3bf1ca2a69731b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d20ec3efaa6b6ff5769e8999df5714a9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/30/6b645357-3bd7-44a5-9399-94f7be7a5ac4.png?resizew=167)
您最近一年使用:0次