1 . 已知
,
,当
取最小值时,以O、P、Q、A四点构成平行四边形,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cae5d204cb33187521c707d3414ce788.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4418440d3158caabb7503d94b1555e34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3b087875ad7156963406bf36c70c126.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d60dcb171bb7fd972aab8294d63acdb3.png)
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2021-03-25更新
|
75次组卷
|
3卷引用:沪教版(2020) 必修第二册 同步跟踪练习 第8章 平面向量 8.3.2 向量线性运算的坐标表示
沪教版(2020) 必修第二册 同步跟踪练习 第8章 平面向量 8.3.2 向量线性运算的坐标表示沪教版(2020) 必修第二册 同步跟踪练习 第8章 8.3.3 向量线性运算的坐标表示(已下线)6.3.3 平面向量加、减运算的坐标表示——课后作业(提升版)
解题方法
2 . 已知
,
,
,
.求:
(1)
;
(2)
;
(3)与
同方向的单位向量
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eff2b66f2fd178d97544a7c657d67c92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/753a20548d11c870df4e8af80e14d2c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bdbfbb76eec32bc4043294f084ce817.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46e9aaed4b0c23fcb1e08bf3b4916206.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/560ee2894ba8c5cee6633430cc8b3b41.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89b1556bb6b2284919fab2b00dccecba.png)
(3)与
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/560ee2894ba8c5cee6633430cc8b3b41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc9638527d61ddbd2b69518e62010ffd.png)
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14-15高二上·上海徐汇·期中
名校
解题方法
3 . 已知向量
与向量
的对应关系用
表示.
(1) 证明:对于任意向量
、
及常数m、n,恒有
;
(2) 证明:对于任意向量
,
;
(3) 证明:对于任意向量
、
,若
,则
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d0de95dc888471ed33cf137b5284226.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d95a8dfa429b6e5f3cff30d07431158e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b97438095118901a45782f8991d0569f.png)
(1) 证明:对于任意向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/969604545902c9a66549a4a44ec3a3c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90ab17fd4247cdd710c363d5d3fbc5bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b6d0c10c2ada5afd8d1dbefe982dc9a.png)
(2) 证明:对于任意向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/969604545902c9a66549a4a44ec3a3c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f17f88b6a6ade833b7728f9c3ba9a30.png)
(3) 证明:对于任意向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/969604545902c9a66549a4a44ec3a3c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90ab17fd4247cdd710c363d5d3fbc5bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bb58883caf5c8ca1e94389839d294b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e236b7f70541f9ba31d9bf4a570fdcfe.png)
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4 . 已知平面向量
,
,若
,则
=__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f1df85c2d82a4c08bb65fe531730e3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/336e0f319187481f73440a5a065d29c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a70d446e6fc756806938596817fd1bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89b1556bb6b2284919fab2b00dccecba.png)
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