当前位置:首页>复习资料>【2026版高考复习三维设计一轮课时培优讲义数学电子版第一节平面向量的概念及线性运算-96aedec09c91

【2026版高考复习三维设计一轮课时培优讲义数学电子版第一节平面向量的概念及线性运算-96aedec09c91

  • 2026-03-28 16:27:49
【2026版高考复习三维设计一轮课时培优讲义数学电子版第一节平面向量的概念及线性运算-96aedec09c91

课标要求

1.理解平面向量的意义、几何表示及两个向量相等的含义.

2.掌握平面向量加、减运算、数乘运算及运算规则,理解其几何意义及两个平面向量共线的含义.

3.了解平面向量的线性运算性质及其几何意义.

1.向量的有关概念

1向量既有大小又有的量叫做向量,向量的大小叫做向量的

2零向量长度为的向量,记作0

3单位向量长度等于长度的向量

4相等向量长度相等且方向的向量

5相反向量长度相等且方向的向量

6平行向量方向相同或的非零向量,也叫做共线向量,规定零向量与任意向量平行.

提醒 单位向量有无数个,它们大小相等,但方向不一定相同与向量a平行的单位向量有两个,即向量.

2.向量的线性运算

向量运算

定义

法则或几何意义

运算律

加法

求两个向量和的运算

交换律abba

结合律:(ab)+c

减法

求两个向量差的运算

aba+(-b

数乘

求实数λ与向量a的积的运算

λa|=|λ||a|,λ0时,λaa的方向

λ0时,λaa的方向

λ0时,λa0

λμa)=

λμaλaμa

λab)=λaλb

提醒 向量加法的多边形法则

多个向量相加,利用向量加法的三角形法则,首尾顺次连接,abc表示从始点指向终点的向量.

3.共线向量定理

向量aa0b共线的充要条件是存在唯一一个实数λ,使.

提醒 当a0时,定理中的实数λ才唯一,否则不唯一.

1.P为线段AB的中点,O为平面内任一点,则).

2.GABC的重心,则0).

3.λμλ,μ为实数),若点A,B,C共线,则λμ1.

4.对于任意两个向量a,b,都有||a|-|b||≤|a±b|≤|a|+|b|.

1.判断正误.(正确的画”,错误的画“×”)

1)|ab是否相等,与a,b的方向无关.(

2若向量ab同向,且a|>|b|,ab.(

3若向量与向量是共线向量,则A,B,C,D四点在一条直线上.(

4起点不同,但方向相同且模相等的向量是相等向量.(

2.〔多选〕下列命题中,正确的是

A.ab都是单位向量,则ab

B.直角坐标平面上的xy轴都是向量

C.若用有向线段表示的向量不相等,则点MN不重合

D.海拔温度角度都不是向量

3.(A必修二P22习题4题改编化简:(1)()+

2.

4.(A必修二P168改编ab是两个不共线向量,且向量aλb-(b2a共线,则λ.

5.(苏教必修二P47复习题9题改编A,B,C三点在一条直线上,点O在该直线外,已知3x+(25xx.

平面向量的有关概念

基础自学过关

1.如图,在正ABC中,D,E,F均为所在边的中点,则以下向量和相等的是

A.B.

C.D.

2.〔多选〕给出下列命题,其中正确的有

A.若两个向量相等,则它们的起点相同,终点相同

B.A,B,C,D是不共线的四点,且ABCD为平行四边形

C.ab的必要条件是a|=|bab

D.两个相等向量的模相等

3.〔多选〕对于任意两个向量a,b,下列命题中正确的是

A.|ab|≥|a|+|b

B.|ab|≥|a|-|b

C.ab共线,则存在唯一的实数λ,使得bλa

D.a,b都是非零向量,则使成立的充分条件是a2b

练后悟通

理解向量有关概念的关键点

1向量定义的关键是方向与长度

2非零共线向量的关键是方向相同或相反,长度没有限制

3相等向量的关键是方向相同且长度相等

4单位向量的关键是长度都是一个单位长度

5零向量的关键是长度是零,规定零向量与任意向量平行.

平面向量的线性运算

定向精析突破

考向1向量的线性运算

1ABC中,ADBC边上的中线,若点O满足2=(

A.-

B.

C.

D.-

2)(A必修二P146改编在平行四边形ABCD中,ACBD交于点O,E是线段OD的中点,AE的延长线与CD交于点F.a,b,则=(

A.abB.ab

C.abD.ab

听课记录

通过网盘分享的文件:word讲义

链接: https://pan.baidu.com/s/1v0ZN4lcjlP-RO3TtjBE84w?pwd=4321 提取码: 4321 

--来自百度网盘超级会员v8的分享

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  1. CONNECT:[ UseTime:0.001036s ] mysql:host=127.0.0.1;port=3306;dbname=i_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001903s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000795s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000801s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001563s ]
  6. SELECT * FROM `set` [ RunTime:0.000739s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001882s ]
  8. SELECT * FROM `article` WHERE `id` = 462976 LIMIT 1 [ RunTime:0.003807s ]
  9. UPDATE `article` SET `lasttime` = 1774764080 WHERE `id` = 462976 [ RunTime:0.001985s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000816s ]
  11. SELECT * FROM `article` WHERE `id` < 462976 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001301s ]
  12. SELECT * FROM `article` WHERE `id` > 462976 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001054s ]
  13. SELECT * FROM `article` WHERE `id` < 462976 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002418s ]
  14. SELECT * FROM `article` WHERE `id` < 462976 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001803s ]
  15. SELECT * FROM `article` WHERE `id` < 462976 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.004257s ]
0.221713s