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2025届高中数学一轮复习练习:第六章限时跟踪检测(三十一) 平面向量的概念及线性运算(含解析)_2.2025数学总复习_2025年新高考资料_一轮复习

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2025届高中数学一轮复习练习:第六章限时跟踪检测(三十一) 平面向量的概念及线性运算(含解析)_2.2025数学总复习_2025年新高考资料_一轮复习
2025届高中数学一轮复习练习:第六章限时跟踪检测(三十一) 平面向量的概念及线性运算(含解析)_2.2025数学总复习_2025年新高考资料_一轮复习
2025届高中数学一轮复习练习:第六章限时跟踪检测(三十一) 平面向量的概念及线性运算(含解析)_2.2025数学总复习_2025年新高考资料_一轮复习
2025届高中数学一轮复习练习:第六章限时跟踪检测(三十一) 平面向量的概念及线性运算(含解析)_2.2025数学总复习_2025年新高考资料_一轮复习
2025届高中数学一轮复习练习:第六章限时跟踪检测(三十一) 平面向量的概念及线性运算(含解析)_2.2025数学总复习_2025年新高考资料_一轮复习
2025届高中数学一轮复习练习:第六章限时跟踪检测(三十一) 平面向量的概念及线性运算(含解析)_2.2025数学总复习_2025年新高考资料_一轮复习
2025届高中数学一轮复习练习:第六章限时跟踪检测(三十一) 平面向量的概念及线性运算(含解析)_2.2025数学总复习_2025年新高考资料_一轮复习

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限时跟踪检测(三十一) 平面向量的概念及线性运算 一、单项选择题 1.(2024·河北廊坊第一次联考)在△ABC中,BD=2DC,E是AD的中点,则AE=( ) A.AB+AC B.AB-AC C.AB-AC D.AB+AC 2.设a是任一向量,e是单位向量,且a∥e,则下列表示形式中正确的是( ) A.e= B.a=|a|e C.a=-|a|e D.a=±|a|e 3.在平行四边形ABCD中,|AB|=3,∠ABC=120°,若+=,则|AC|=( ) A.2 B.3 C.4 D.3 4.如图所示的方格纸中有定点O,P,Q,E,F,G,H,则OP+OQ=( ) A.OH B.OG C.EO D.FO 5.已知M是△ABC的重心,D为BC的中点,则下列等式成立的是( ) A.|MA|=|MB|=|MC| B.MA+MB+MC=0 C.BM=BA+BD D.S =S △MBC △ABC 6.如图所示,已知AB是圆O的直径,点C,D是半圆弧的两个三等分点,AB=a, AC=b,则AD=( ) A.a-b B.a-b C.a+b D.a+b 7.在四边形ABCD中,AB=a+2b,BC=-4a-b,CD=-5a-3b,则四边形ABCD 的形状是( ) A.矩形 B.平行四边形 C.梯形 D.以上都不对 8.如图所示,设O是△ABC内部一点,且OA+OC=-2OB,则△ABC与△AOC的面积之比为( ) A.4∶1 B.2∶1 C.3∶2 D.4∶3 9.已知向量e,e 是两个不共线的向量,a=2e-e 与b=e+λe 共线,则λ=( ) 1 2 1 2 1 2 A.2 B.-2 C.- D. 10.已知平面上不共线的四点O,A,B,C,若OA-4OB+3OC=0,则=( ) A. B. C. D. 二、多项选择题 11.设点M是△ABC所在平面内一点,则下列说法正确的是( ) A.若AM=AB+AC,则点M是边BC的中点 B.若AM=2AB-AC,则点M在边BC的延长线上 C.若AM=-BM-CM,则点M是△ABC的重心 D.若AM=xAB+yAC,且x+y=,则△MBC的面积是△ABC面积的 三、填空题与解答题 12.一条河的两岸平行,河的宽度d=4 km,一艘船从岸边A处出发到河的正对岸, 已知船的速度|v|=10 km/h,水流速度|v|=2 km/h,那么当行驶航程最短时,所用时间是 1 2 ________h.(附:≈2.449.结果精确到0.01) 13.(2024·云南丽江模拟)在△ABC中,点D在线段AC上,且满足| AD|=| AC|,点Q 为线段BD上任意一点,若实数x,y满足AQ=xAB+yAC,则+的最小值为________. 14.设a,b是不共线的两个向量. (1)若OA=2a-b,OB=3a+b,OC=a-3b,求证:A,B,C三点共线; (2)若8a+kb与ka+2b共线,求实数k的值. 高分推荐题 15.(2024·河北衡水中学模拟)已知O是平面上一定点,A,B,C是平面上不共线的三点,动点P满足OP=+λ,λ∈[0,+∞),则点P的轨迹经过△ABC的( ) A.外心 B.内心 C.重心 D.垂心 解析版 一、单项选择题 1.(2024·河北廊坊第一次联考)在△ABC中,BD=2DC,E是AD的中点,则AE=( ) A.AB+AC B.AB-AC C.AB-AC D.AB+AC 解析:在△ABC中,因为BD=2DC,所以BD=(AC-AB)=AC-AB,则AD=AB+ BD=AB+AC-AB=AB+AC,因为E是AD的中点,所以AE=AD=AB+AC,故选A. 答案:A 2.设a是任一向量,e是单位向量,且a∥e,则下列表示形式中正确的是( ) A.e= B.a=|a|e C.a=-|a|e D.a=±|a|e 解析:对于A,当a=0时,没有意义,错误;对于B,C,D,当a=0时,选项B, C,D都对;当a≠0,由a∥e可知,a与e同向或反向.故选D. 答案:D 3.在平行四边形ABCD中,|AB|=3,∠ABC=120°,若+=,则|AC|=( ) A.2 B.3 C.4 D.3 解析:∵+=,则BD平分∠ABC,则四边形ABCD为菱形,且∠ABC=120°,由|AB| =|BC|=3,∴|AC|=3,故选B. 答案:B 4.如图所示的方格纸中有定点O,P,Q,E,F,G,H,则OP+OQ=( ) A.OH B.OG C.EO D.FO 解析:在方格纸上作出OP+OQ,如图所示,连接FO,则容易看出OP+OQ=FO, 故选D.答案:D 5.已知M是△ABC的重心,D为BC的中点,则下列等式成立的是( ) A.|MA|=|MB|=|MC| B.MA+MB+MC=0 C.BM=BA+BD D.S =S △MBC △ABC 解析:如图,M为△ABC的重心,则MA+MB-MC=0,A,B错误;BM=BD+DM =BD+DA=BD+(BA-BD)=BA+BD,C错误;由DM=AD得S =S ,D正确. △MBC △ABC 答案:D 6.如图所示,已知AB是圆O的直径,点C,D是半圆弧的两个三等分点,AB=a, AC=b,则AD=( ) A.a-b B.a-b C.a+b D.a+b 解析:连接CD(图略),由点C,D是半圆弧的两个三等分点,得CD∥AB,且CD= AB=a,所以AD=AC+CD=b+a. 答案:D 7.在四边形ABCD中,AB=a+2b,BC=-4a-b,CD=-5a-3b,则四边形ABCD 的形状是( ) A.矩形 B.平行四边形 C.梯形 D.以上都不对 解析:由已知得AD=AB+BC+CD=-8a-2b=2(-4a-b)=2BC. ∴AD∥BC.又AB与CD不平行,∴四边形ABCD是梯形. 答案:C 8.如图所示,设O是△ABC内部一点,且OA+OC=-2OB,则△ABC与△AOC的 面积之比为( )A.4∶1 B.2∶1 C.3∶2 D.4∶3 解析:取AC的中点D,连接OD, 则OA+OC=2OD, 所以OB=-OD, 所以O是AC边上的中线BD的中点, 所以S =2S , △ABC △AOC 所以△ABC与△AOC面积之比为2∶1. 答案:B 9.已知向量e,e 是两个不共线的向量,a=2e-e 与b=e+λe 共线,则λ=( ) 1 2 1 2 1 2 A.2 B.-2 C.- D. 解析:因为a=2e-e 与b=e+λe 共线,所以ka=b,k≠0, 1 2 1 2 所以k(2e-e)=e+λe. 1 2 1 2 因为向量e,e 是两个不共线的向量, 1 2 所以解得λ=-. 答案:C 10.已知平面上不共线的四点O,A,B,C,若OA-4OB+3OC=0,则=( ) A. B. C. D. 解析:由OA-4OB+3OC=0,得OA-OB=3(OB-OC),即BA=3CB,所以CA=CB +BA=BA,所以|AB|=|CA|,即=. 答案:B 二、多项选择题 11.设点M是△ABC所在平面内一点,则下列说法正确的是( ) A.若AM=AB+AC,则点M是边BC的中点 B.若AM=2AB-AC,则点M在边BC的延长线上 C.若AM=-BM-CM,则点M是△ABC的重心 D.若AM=xAB+yAC,且x+y=,则△MBC的面积是△ABC面积的 解析:若AM=AB+AC,则点M是边BC的中点,故A正确; 若AM=2AB-AC,即有AM-AB=AB-AC,即BM=CB,则点M在边CB的延长线上,故B错误; 若AM=-BM-CM, 即AM+BM+CM=0, 则点M是△ABC的重心,故C正确; 如图,由AM=xAB+yAC,且x+y=, 可得2AM=2xAB+2yAC,且2x+2y=1, 设AN=2AM, 则M为AN的中点,且AN=2xAB+2yAC, 则B,N,C三点共线,则△MBC的面积是△ABC面积的,故D正确. 答案:ACD 三、填空题与解答题 12.一条河的两岸平行,河的宽度d=4 km,一艘船从岸边A处出发到河的正对岸, 已知船的速度|v|=10 km/h,水流速度|v|=2 km/h,那么当行驶航程最短时,所用时间是 1 2 ________h.(附:≈2.449.结果精确到0.01) 解析:要使航程最短,需使船的速度与水流速度的合成速度v必须垂直于对岸,如图 所示,|v|==(km/h),所以t===≈0.41(h). 答案:0.41 13.(2024·云南丽江模拟)在△ABC中,点D在线段AC上,且满足| AD|=| AC|,点Q 为线段BD上任意一点,若实数x,y满足AQ=xAB+yAC,则+的最小值为________. 解析:由题意知点D满足AD=AC,故AQ=xAB+yAC=xAB+3yAD,由点Q,B, D三点共线可得x+3y=1,x>0,y>0,则+=·(x+3y)=4++≥4+2,当且仅当=,即x =,y=时等号成立. 答案:4+2 14.设a,b是不共线的两个向量. (1)若OA=2a-b,OB=3a+b,OC=a-3b,求证:A,B,C三点共线;(2)若8a+kb与ka+2b共线,求实数k的值. (1)证明:∵AB=(3a+b)-(2a-b)=a+2b, BC=(a-3b)-(3a+b)=-2a-4b=-2AB, ∴AB与BC共线,且有公共点B, ∴A,B,C三点共线. (2)解:∵8a+kb与ka+2b共线, ∴存在实数λ,使得8a+kb=λ(ka+2b), ∴(8-λk)a+(k-2λ)b=0. ∵a与b不共线, ∴⇒8=2λ2 λ=±2. ∴k=2λ=±4. ⇒ 高分推荐题 15.(2024·河北衡水中学模拟)已知O是平面上一定点,A,B,C是平面上不共线的三 点,动点P满足OP=+λ,λ∈[0,+∞),则点P的轨迹经过△ABC的( ) A.外心 B.内心 C.重心 D.垂心 解析:设BC的中点为D, ∵OP=+λ, ∴OP=OD+λ, 即DP=λ, ∴DP·BC=λ =λ =λ(-|BC|+|BC|)=0, ∴DP⊥BC,∴点P在BC的垂直平分线上,即点P的轨迹经过△ABC的外心. 答案:A ∴DP⊥BC,∴点P在BC的垂直平分线上,即点P的轨迹经过△ABC的外心. 答案:A
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  1. CONNECT:[ UseTime:0.000420s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000647s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000317s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000255s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000528s ]
  6. SELECT * FROM `set` [ RunTime:0.000462s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.000747s ]
  8. SELECT * FROM `wendang` WHERE `id` = 370279 LIMIT 1 [ RunTime:0.000559s ]
  9. UPDATE `wendang` SET `liulancishu` = 1 WHERE `id` = 370279 [ RunTime:0.001112s ]
  10. UPDATE `wendang` SET `lasttime` = 1773093466 WHERE `id` = 370279 [ RunTime:0.000653s ]
  11. SELECT * FROM `wendang` WHERE `id` < 370279 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000604s ]
  12. SELECT * FROM `wendang` WHERE `id` > 370279 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000440s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 370279 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001136s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 370279 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000919s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 370279 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.007680s ]
0.085472s