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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(三十四) 复数(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知识梳理(课件+讲义+练习)(完结)

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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(三十四) 复数(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知识梳理(课件+讲义+练习)(完结)
2025届高中数学一轮复习练习:第六章限时跟踪检测(三十四) 复数(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知识梳理(课件+讲义+练习)(完结)
2025届高中数学一轮复习练习:第六章限时跟踪检测(三十四) 复数(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知识梳理(课件+讲义+练习)(完结)
2025届高中数学一轮复习练习:第六章限时跟踪检测(三十四) 复数(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知识梳理(课件+讲义+练习)(完结)
2025届高中数学一轮复习练习:第六章限时跟踪检测(三十四) 复数(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知识梳理(课件+讲义+练习)(完结)
2025届高中数学一轮复习练习:第六章限时跟踪检测(三十四) 复数(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知识梳理(课件+讲义+练习)(完结)

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限时跟踪检测(三十四) 复 数 一、单项选择题 1.已知i是虚数单位,则“a=i”是“a2=-1”的( ) A.充分不必要条件 B.必要不充分条件 C.充要条件 D.既不充分也不必要条件 2.(2024·河南联考)若(1+i)(1-2i)=a+bi(a,b∈R),则a+b=( ) A.-1 B.0 C.2 D.3 3.(2024·辽宁模拟)已知a+i=-2+bi(a,b∈R),则|a+bi|=( ) A.1 B. C.3 D.9 4.(2024·江西赣州模拟)若复数=A+Bi(m,A,B∈R),且A+B=0,则实数m的值是( ) A. B. C.- D.2 5.(2024·安徽蚌埠模拟)非零复数z满足=-zi,则复数z在复平面内对应的点位于( ) A.实轴 B.虚轴 C.第一或第三象限 D.第二或第四象限 6.(2024·山东东营模拟)如图,若向量OZ对应的复数为z,且|z|=,则=( ) A.+i B.--i C.-i D.-+i 7.△ABC的三个顶点对应的复数分别为z ,z ,z ,若复数z满足|z-z|=|z-z|=|z-z|,则z对应的点为 1 2 3 1 2 3 △ABC的( ) A.内心 B.垂心 C.重心 D.外心 8.(2024·陕西西安模拟)已知方程x2+(4+i)x+4+ai=0(a∈R)有实根b,且z=a+bi,则复数z=( ) A.2-2i B.2+2i C.-2+2i D.-2-2i 9.复数z ,z 在复平面内分别对应点A,B,z =3+4i,将点A绕原点O逆时针旋转90°得到点B,如图所示, 1 2 1 则 =( ) 2 A.3-4i B.-4-3i C.-4+3i D.-3-4i10.若复数(x-3)+yi(x,y∈R)的模为2,则的最大值为( ) A. B. C. D. 二、多项选择题 11.(2024·山东济宁模拟)已知复数z =-2+i(i为虚数单位),复数z 满足|z -1+2i|=2,z 在复平面内对应的 1 2 2 2 点为M(x,y),则下列说法正确的是( ) A.复数z 在复平面内对应的点位于第二象限 1 B.=--i C.(x+1)2+(y-2)2=4 D.|z-z|的最大值为3+2 2 1 三、填空题与解答题 12.已知复数z=,则复数z在复平面内对应的点为________. 13.设复数z,z 分别对应复平面上的点A,B,且∠AOB=60°,若|z-z|=1,则|z|的最大值为________. 1 2 1 2 1 14.若虚数z同时满足下列两个条件: ①z+是实数;②z+3的实部与虚部互为相反数.这样的虚数是否存在?若存在,求出 z;若不存在,请说明 理由. 高分推荐题 15.(多选)欧拉公式exi=cos x+isin x是由瑞士著名数学家欧拉创立,该公式将指数函数的定义域扩大到复数, 建立了三角函数与指数函数的关联,在复变函数论里面占有非常重要的地位,被誉为数学中的天桥,依据欧拉公 式,下列选项正确的是( ) A.复数e2i对应的点位于第二象限 i B.e 为纯虚数 C.复数的模等于 i D.e 的共轭复数为-i 解析版 一、单项选择题 1.已知i是虚数单位,则“a=i”是“a2=-1”的( ) A.充分不必要条件 B.必要不充分条件 C.充要条件 D.既不充分也不必要条件 解析:i是虚数单位,则i2=-1,“a=i”是“a2=-1”的充分条件; 由a2=-1,得a=±i, 故“a=i”是“a2=-1”的充分不必要条件. 答案:A 2.(2024·河南联考)若(1+i)(1-2i)=a+bi(a,b∈R),则a+b=( )A.-1 B.0 C.2 D.3 解析:因为(1+i)(1-2i)=3-i=a+bi,所以a=3,b=-1,所以a+b=2.故选C. 答案:C 3.(2024·辽宁模拟)已知a+i=-2+bi(a,b∈R),则|a+bi|=( ) A.1 B. C.3 D.9 解析:因为a+i=-2+bi,所以a=-2,b=,则|a+bi|===3.故选C. 答案:C 4.(2024·江西赣州模拟)若复数=A+Bi(m,A,B∈R),且A+B=0,则实数m的值是( ) A. B. C.- D.2 解析:由题意知,2-mi=(A+Bi)(1+2i)=A-2B+(2A+B)i, ∴解得 答案:C 5.(2024·安徽蚌埠模拟)非零复数z满足=-zi,则复数z在复平面内对应的点位于( ) A.实轴 B.虚轴 C.第一或第三象限 D.第二或第四象限 解析:由题意,设z=a+bi(a,b∈R),故=-zi a-bi=-(a+bi)i=-ai+b, 故a=b,-b=-a, ⇔ 即复数z=a+ai,在复平面内对应的点位于第一或第三象限的角平分线上. 答案:C 6.(2024·山东东营模拟)如图,若向量OZ对应的复数为z,且|z|=,则=( ) A.+i B.--i C.-i D.-+i 解析:由题意,设z=-1+bi(b>0),则|z|==,解得b=2,即z=-1+2i,所以====-+i.故选D. 答案:D 7.△ABC的三个顶点对应的复数分别为z ,z ,z ,若复数z满足|z-z|=|z-z|=|z-z|,则z对应的点为 1 2 3 1 2 3 △ABC的( ) A.内心 B.垂心 C.重心 D.外心 解析:因为|z-z|,|z-z|,|z-z|表示复数z对应的点分别到点A,B,C的距离,故由|z-z|=|z-z|=|z-z|, 1 2 3 1 2 3 知复数z对应的点到△ABC三个顶点的距离都相等,则z对应的点是△ABC的外心,故选D. 答案:D 8.(2024·陕西西安模拟)已知方程x2+(4+i)x+4+ai=0(a∈R)有实根b,且z=a+bi,则复数z=( ) A.2-2i B.2+2iC.-2+2i D.-2-2i 解析:由已知,得b2+b(4+i)+4+ai=0, 即b2+4b+4+(a+b)i=0, 所以解得 所以z=2-2i. 答案:A 9.复数z ,z 在复平面内分别对应点A,B,z =3+4i,将点A绕原点O逆时针旋转90°得到点B,如图所示, 1 2 1 则 =( ) 2 A.3-4i B.-4-3i C.-4+3i D.-3-4i 解析:由题意知A(3,4),B(-4,3),即z=-4+3i,=-4-3i. 2 2 答案:B 10.若复数(x-3)+yi(x,y∈R)的模为2,则的最大值为( ) A. B. C. D. 解析: 因为复数(x-3)+yi(x,y∈R)的模为2, 所以(x-3)2+y2=4, 表示以(3,0)为圆心,2为半径的圆,如图所示, 表示过原点和圆上的点(x,y)的直线的斜率,由图可知,当直线与圆相切时,取得最值, 设切线方程为y=kx, 则=2,解得k=±, 所以的最大值为. 答案:A 二、多项选择题 11.(2024·山东济宁模拟)已知复数z =-2+i(i为虚数单位),复数z 满足|z -1+2i|=2,z 在复平面内对应的 1 2 2 2 点为M(x,y),则下列说法正确的是( ) A.复数z 在复平面内对应的点位于第二象限 1 B.=--i C.(x+1)2+(y-2)2=4 D.|z-z|的最大值为3+2 2 1 解析:对于A,复数z 在复平面内对应的点的坐标为(-2,1),该点位于第二象限,故A正确; 1 对于B,===--i,故B正确; 对于C,z-1+2i=(x-1)+(y+2)i, 2∵|z-1+2i|=2, 2 ∴(x-1)2+(y+2)2=4,故C错误; 对于D,z-1+2i=-3+3i, 1 则|z-1+2i|==3. 1 |z-z|=|(z-1+2i)-(z-1+2i)|≤|z-1+2i|+|z-1+2i|=2+3,故D正确. 2 1 2 1 2 1 答案:ABD 三、填空题与解答题 12.已知复数z=,则复数z在复平面内对应的点为________. 解析:∵i4n+1+i4n+2+i4n+3+i4n+4=i+i2+i3+i4=0,而2 023=4×505+3,∴z=====,∴复数z在复平面 内对应的点为. 答案: 13.设复数z,z 分别对应复平面上的点A,B,且∠AOB=60°,若|z-z|=1,则|z|的最大值为________. 1 2 1 2 1 解析:方法一:依题意,不妨设复数z =a,z =b(1+i)(a,b为正实数),代入|z -z|=1,并化简得4b2-2ab 1 2 1 2 +a2-1=0, 关于b的方程显然有实根, ∴Δ=(-2a)2-4×4(a2-1)≥0, 解得a2≤,即|a|≤,故|z| =. 1max 方法二:∠AOB=60°,且|AB|=|z -z|=1,即点O对定长的线段AB的张角一定为60°,可知点O在以AB为 1 2 弦的圆M的优弧上,如图所示. 显然线段AO长度(即|z|)的最大值为圆M的直径. 1 由平面几何知识,易知该圆直径为2R==,所以|z| =. 1max 答案: 14.若虚数z同时满足下列两个条件: ①z+是实数;②z+3的实部与虚部互为相反数.这样的虚数是否存在?若存在,求出 z;若不存在,请说明 理由. 解:这样的虚数存在,z=-1-2i或z=-2-i. 理由如下: 设z=a+bi(a,b∈R且b≠0), 则z+=a+bi+=a+bi+=+i. ∵z+是实数,∴b-=0. 又b≠0,∴a2+b2=5.① 又z+3=(a+3)+bi的实部与虚部互为相反数,∴a+3+b=0.② 联立①②得解得或故存在虚数z=-1-2i或z=-2-i满足条件. 高分推荐题 15.(多选)欧拉公式exi=cos x+isin x是由瑞士著名数学家欧拉创立,该公式将指数函数的定义域扩大到复数,建立了三角函数与指数函数的关联,在复变函数论里面占有非常重要的地位,被誉为数学中的天桥,依据欧拉公 式,下列选项正确的是( ) A.复数e2i对应的点位于第二象限 i B.e 为纯虚数 C.复数的模等于 i D.e 的共轭复数为-i 解析:e2i=cos 2+isin 2,因为<2<π,即cos 2<0,sin 2>0,故复数e2i对应的点位于第二象限,A正确; i i e=cos+isin=i,e 为纯虚数,B正确; = = =+i, 于是得 = =,C正确; i e=cos+isin=+i, 其共轭复数为-i,D错误. 答案:ABC
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  1. CONNECT:[ UseTime:0.001160s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001598s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.007246s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000668s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001413s ]
  6. SELECT * FROM `set` [ RunTime:0.003719s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.001503s ]
  8. SELECT * FROM `wendang` WHERE `id` = 370286 LIMIT 1 [ RunTime:0.001112s ]
  9. UPDATE `wendang` SET `liulancishu` = 1 WHERE `id` = 370286 [ RunTime:0.005340s ]
  10. UPDATE `wendang` SET `lasttime` = 1773093497 WHERE `id` = 370286 [ RunTime:0.001326s ]
  11. SELECT * FROM `wendang` WHERE `id` < 370286 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001311s ]
  12. SELECT * FROM `wendang` WHERE `id` > 370286 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001083s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 370286 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.003920s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 370286 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.015232s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 370286 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.017896s ]
0.238484s