当前位置:首页>文档>2024年高考数学一轮复习(新高考版)第5章 必刷小题10 平面向量与复数_2.2025数学总复习_2024年新高考资料_1.2024一轮复习_2024年高考数学一轮复习讲义(新高考版)

2024年高考数学一轮复习(新高考版)第5章 必刷小题10 平面向量与复数_2.2025数学总复习_2024年新高考资料_1.2024一轮复习_2024年高考数学一轮复习讲义(新高考版)

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2024年高考数学一轮复习(新高考版)第5章 必刷小题10 平面向量与复数_2.2025数学总复习_2024年新高考资料_1.2024一轮复习_2024年高考数学一轮复习讲义(新高考版)
2024年高考数学一轮复习(新高考版)第5章 必刷小题10 平面向量与复数_2.2025数学总复习_2024年新高考资料_1.2024一轮复习_2024年高考数学一轮复习讲义(新高考版)
2024年高考数学一轮复习(新高考版)第5章 必刷小题10 平面向量与复数_2.2025数学总复习_2024年新高考资料_1.2024一轮复习_2024年高考数学一轮复习讲义(新高考版)
2024年高考数学一轮复习(新高考版)第5章 必刷小题10 平面向量与复数_2.2025数学总复习_2024年新高考资料_1.2024一轮复习_2024年高考数学一轮复习讲义(新高考版)
2024年高考数学一轮复习(新高考版)第5章 必刷小题10 平面向量与复数_2.2025数学总复习_2024年新高考资料_1.2024一轮复习_2024年高考数学一轮复习讲义(新高考版)
2024年高考数学一轮复习(新高考版)第5章 必刷小题10 平面向量与复数_2.2025数学总复习_2024年新高考资料_1.2024一轮复习_2024年高考数学一轮复习讲义(新高考版)

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必刷小题 10 平面向量与复数 一、单项选择题 1.(2022·临沂模拟)设向量a=(1,x),b=(x,9),若a∥b,则x等于( ) A.-3 B.0 C.3 D.3或-3 答案 D 解析 由a∥b,得9-x2=0,所以x=±3. 2.(2023·长沙模拟)设z(1-2i)=|3+4i|,则z的共轭复数在复平面内对应的点在( ) A.第一象限 B.第二象限 C.第三象限 D.第四象限 答案 D 解析 因为z(1-2i)=|3+4i|==5, 所以z====1+2i, 所以z的共轭复数为1-2i,它在复平面内对应的点(1,-2)在第四象限. 3.已知向量a,b满足|a|=1,a·b=-1,则a·(2a-b)等于( ) A.4 B.3 C.2 D.0 答案 B 解析 因为|a|=1,a·b=-1,所以a·(2a-b)=2a2-a·b=2+1=3. 4.(2022·聊城模拟)若向量a,b满足|a|=1,|b|=2,a⊥(a+b),则a与b的夹角为( ) A. B. C. D. 答案 C 解析 由题可知,|a|=1,|b|=2,a·(a+b)=|a|2+a·b=0⇒a·b=-1, ∴cos〈a,b〉===-. ∵〈a,b〉∈[0,π],∴向量a与b的夹角为. 5.如图,在△ABC中,点O是BC的中点,过点O的直线分别交直线AB,AC于不同的两点 M,N,若AB=mAM,AC=nAN,则m+n等于( ) A.0 B.1 C.2 D.3 答案 C 解析 如图,连接AO,由O为BC的中点可得,AO=(AB+AC)=AM+AN,∵M,O,N三点共线,∴+=1,即m+n=2. 6.定义:|a×b|=|a|·|b|sin θ,其中θ为向量a与b的夹角,若|a|=2,|b|=5,a·b=-6,则| a×b|等于( ) A.8 B.-8 C.8或-8 D.6 答案 A 解析 由已知可得cos θ==-, ∵0≤θ≤π,∴sin θ==, ∴|a×b|=|a|·|b|sin θ=8. 7.(2023·日照模拟)已知△ABC是边长为1的等边三角形,点D,E分别是边AB,BC的中 点,且DE=3EF,则AF·BC的值为( ) A.- B. C.1 D.-8 答案 B 解析 如图所示,把△ABC放在直角坐标系中, 由于△ABC的边长为1,故B(0,0),C(1,0),A,∵点D,E分别是边AB,BC的中点, ∴D,E,设F(x,y),DE=,EF=,∵DE=3EF,∴⇒⇒F,AF=,BC=(1,0),AF·BC=. 8.(2023·岳阳模拟)在一个边长为2的等边△ABC中,若点P是平面ABC内的任意一点,则 PA·PC的最小值是( ) A.- B.- C.-1 D.- 答案 C 解析 如图,以AC为x轴,AC中点为原点建立平面直角坐标系,则A(-1,0),C(1,0), 设P(x,y),则PA=(-1-x,-y),PC=(1-x,-y), ∴PA·PC=x2-1+y2=x2+y2-1≥-1,当且仅当P在原点时,取等号. 故PA·PC的最小值是-1.二、多项选择题 9.(2022·潍坊模拟)若复数z =2+3i,z =-1+i,其中i是虚数单位,则下列说法正确的是 1 2 ( ) A.∈R B.=· C.若z+m(m∈R)是纯虚数,那么m=-2 1 D.若,在复平面内对应的向量分别为OA,OB(O为坐标原点),则|AB|=5 答案 BC 解析 对于A,====-i,A错误; 对于B,∵z·z=(2+3i)(-1+i)=-5-i,∴=-5+i; 1 2 又·=(2-3i)(-1-i)=-5+i,∴=·,B正确; 对于C,∵z+m=2+m+3i为纯虚数,∴m+2=0,解得m=-2,C正确; 1 对于D,由题意得OA=(2,-3),OB=(-1,-1),∴AB=OB-OA=(-3,2), ∴|AB|==,D错误. 10.已知向量a=(2,1),b=(1,-1),c=(m-2,-n),其中m,n均为正数,且(a- b)∥c,则下列说法正确的是( ) A.a与b的夹角为钝角 B.向量a在b上的投影向量为b C.2m+n=4 D.mn的最大值为2 答案 CD 解析 对于A,向量a=(2,1),b=(1,-1), 则a·b=2-1=1>0,又a,b不共线, 所以a,b的夹角为锐角,故A错误; 对于B,向量a在b上的投影向量为 ·=b,B错误; 对于C,a-b=(1,2),若(a-b)∥c, 则-n=2(m-2),变形可得2m+n=4,C正确; 对于D,由2m+n=4,且m,n均为正数, 得mn=(2m·n)≤2=2,当且仅当m=1,n=2时,等号成立,即mn的最大值为2,D正确. 11.瑞士数学家欧拉在1765年发表的《三角形的几何学》一书中有这样一个定理:三角形 的外心、垂心和重心都在同一直线上,而且外心和重心间的距离是垂心和重心间的距离的一 半.这个定理就是著名的欧拉线定理.设△ABC中,点O,H,G分别是外心、垂心、重心. 下列四个选项中结论正确的是( ) A.GH=2OGB.GA+GB+GC=0 C.设BC边的中点为D,则有AH=3OD D.OA=OB=OC 答案 AB 解析 如图, 对于A项,由题意得AG=2GD,AH⊥BC, 所以GH=2OG,所以A选项正确; 对于B项,设D为BC的中点, GB+GC=2GD=-GA, 所以GA+GB+GC=0,所以B选项正确; 对于C项,因为D为BC的中点,G为△ABC的重心, 所以AG=2GD,GH=2OG,∠AGH=∠DGO, 所以△AGH∽△DGO, 所以AH=2OD,故C选项错误; 对于D项,向量OA,OB,OC的模相等,方向不同,故D选项错误. 12.(2023·潍坊模拟)已知向量OP=(1,2),将OP绕原点O旋转-30°,30°,60°到OP1,OP2, OP3的位置,则下列说法正确的是( ) A.OP1·OP3=0 B.|PP1|=|PP2| C.OP·OP3=OP1·OP2 D.点P 的坐标为 1 答案 ABC 解析 由题意作图如图所示, ∵OP1⊥OP3,∴OP1·OP3=0,故选项A正确; ∵PP 与PP 所对的圆心角相等,∴|PP1|=|PP2|,故选项B正确; 1 2∵OP·OP3=|OP||OP3|cos 60°=. OP1·OP2=|OP1||OP2|cos 60°=,故选项C正确; 若点P 坐标为, 1 则|OP1|=≠,故选项D错误. 三、填空题 13.设{e ,e}为基底,已知向量AB=e -ke ,CB=2e -e ,CD=3e -3e ,若A,B,D三 1 2 1 2 1 2 1 2 点共线,则k的值是________. 答案 2 解析 因为AB=e-ke,CB=2e-e,CD=3e-3e, 1 2 1 2 1 2 所以BD=CD-CB=e-2e, 1 2 若A,B,D三点共线,则AB∥BD, 所以存在实数λ使得AB=λBD, 故e-ke=λ(e-2e),所以λ=1,k=2. 1 2 1 2 14.已知i是虚数单位,则=________. 答案 解析 因为i2 021=i,2 022=2 022=2 022=i2 022=i2=-1, 所以=|-1+i|==. 15.(2022·泰安模拟)如图,在四边形ABCD中,AB=3DC,E为边BC的中点,若AE=λAB+ μAD,则λ+μ=________. 答案 解析 连接AC,如图所示, AE=AB+AC=AB+(AD+DC)=AB+, 所以AE=AB+AD, 则λ+μ=+=. 16.(2023·济宁模拟)等边△ABC的外接圆的半径为2,点P是该圆上的动点,则PA·PB+ PB·PC的最大值为________. 答案 8 解析 ∵△ABC为等边三角形,其外接圆的半径为2, ∴以三角形的外接圆圆心为原点建立平面直角坐标系,如图所示,则A(2,0),B(-1,),C(-1,-), 设P(2cos θ,2sin θ), 则PA=(2-2cos θ,-2sin θ),PB=(-1-2cos θ,-2sin θ),PC=(-1-2cos θ,--2sin θ), 则PA·PB+PB·PC=(2-2cos θ)(-1-2cos θ)+2sin θ(2sin θ-)+(2cos θ+1)2+(2sin θ-) (2sin θ+)=4+2cos θ-2sin θ=4+4cos, ∴0≤PA·PB+PB·PC≤8, 则PA·PB+PB·PC的最大值为8.
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  1. CONNECT:[ UseTime:0.001099s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001610s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000729s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000669s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001303s ]
  6. SELECT * FROM `set` [ RunTime:0.000592s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.001501s ]
  8. SELECT * FROM `wendang` WHERE `id` = 369790 LIMIT 1 [ RunTime:0.001071s ]
  9. UPDATE `wendang` SET `liulancishu` = 1 WHERE `id` = 369790 [ RunTime:0.002581s ]
  10. UPDATE `wendang` SET `lasttime` = 1773090686 WHERE `id` = 369790 [ RunTime:0.001143s ]
  11. SELECT * FROM `wendang` WHERE `id` < 369790 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001055s ]
  12. SELECT * FROM `wendang` WHERE `id` > 369790 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001258s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 369790 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.003592s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 369790 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.011979s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 369790 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002491s ]
0.202040s