当前位置:首页>学习笔记>【26版步步高高中数学人教A版必修二学习笔记章末检测试卷二(第七章)

【26版步步高高中数学人教A版必修二学习笔记章末检测试卷二(第七章)

  • 2026-02-03 12:53:14
【26版步步高高中数学人教A版必修二学习笔记章末检测试卷二(第七章)

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章末检测试卷二(第七章)

[时间:120分钟 分值:150分]

一、单项选择题(本题共8小题,每小题5分,共40分)

1.(2023·新高考全国)已知z=,则z-等于(  )

A.- iB.iC.0D.1

答案 A

解析因为z==

==-i,所以=i,

z-=-i.

2.(2023·新高考全国)在复平面内,(1+3i)(3-i)对应的点位于(  )

A.第一象限B.第二象限

C.第三象限D.第四象限

答案 A

解析因为(1+3i)(3-i)=3+8i-3i2=6+8i,

则所求复数在复平面内对应的点为(6,8),位于第一象限.

3.若z1,z2为复数,则z1+z2是实数z1,z2互为共轭复数的(  )

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

答案 B

解析由题意,不妨设z1=a+bi,

z2=c+di(a,b,c,dR),

z1+z2是实数,则z1+z2=a+bi+c+di=(a+c)+(b+d)iR,

b+d=0,即b=-d,

由于a,c不一定相等,故z1,z2不一定互为共轭复数,故充分性不成立;

z1,z2互为共轭复数,则z2=a-bi,

z1+z2=2aR,故必要性成立.

因此z1+z2是实数z1,z2互为共轭复数的必要不充分条件.

4.设i是虚数单位,x是实数,若复数的虚部是2,则x等于(  )

A.4B.2C.-2D.-4

答案 D

解析复数=

==-x-xi,

复数(xR)的虚部为2,

-x=2,∴x=-4.

5.(2022·全国乙卷)已知z=1-2i,且z+a+b=0,其中a,b为实数,则(  )

A.a=1,b=-2B.a=-1,b=2

C.a=1,b=2D.a=-1,b=-2

答案 A

解析由题意知=1+2i,

所以z+a+b=1-2i+a(1+2i)+b

=a+b+1+(2a-2)i,

z+a+b=0,且a,bR,

所以解得

6.设复数z1,z2在复平面内的对应点关于虚轴对称,且z1=3-2i,则|+z2|等于(  )

A.2B.5C.3D.10

答案 D

解析由题意得,z2=-3-2i,

+z2=(3-2i)2+(-3-2i)

=5-12i-3-2i=2-14i,

|+z2|==10.

7.复数z=(aR)为纯虚数,则|2a+i|等于(  )

A.B.C.2D.3

答案 B

解析因为z=为纯虚数,

所以设z=bi(bR,b≠0),

bi=,则bi(a+i)=2-i,

因此-b+abi=2-i,

从而

所以|2a+i|=|1+i|==.

8.1748年,瑞士数学家欧拉发现了复指数函数和三角函数的关系,并写出以下公式eix=cos x+isin x(e是自然对数的底数,i是虚数单位),这个公式在复变论中占有非常重要的地位,被誉为数学中的天桥.下列说法正确的是(  )

A.+1=0B.=1

C.cos x=D.sin x=

答案 C

解析对于A,当x=时,

因为=cos+isin=i,

所以+1=i+1≠0,选项A错误;

对于B,=

==eπi=cosπ+isinπ=-1,选项B错误;

对于C,由eix=cosx+isinx,

e-ix=cos(-x)+isin(-x)=cosx-isinx,

所以eix+e-ix=2cosx,

得出cosx=,选项C正确;

对于D,由C选项的分析得eix-e-ix=2isinx,得出sinx=-i,选项D错误.

二、多项选择题(本题共3小题,每小题6分,共18分.全部选对的得6分,部分选对的得部分分,有选错的得0分)

9.已知i为虚数单位,下列说法中正确的是(  )

A.若复数z满足|z-i|=,则复数z在复平面内对应的点在以(1,0)为圆心,为半径的圆上

B.若复数z满足z+|z|=2+8i,则复数z=-15+8i

C.若复数z1,z2满足|z1|=|z2|,则z1·=z2·

D.若复数z1,z2满足|z1|=|z2|,则=

答案 BC

解析满足|z-i|=的复数z在复平面内对应的点在以(0,1)为圆心,为半径的圆上,故A错误;

z=a+bi(a,bR),

|z|=,由z+|z|=2+8i,

a+bi+=2+8i,

解得

z=-15+8i,故B正确;

z1=a1+b1i,z2=a2+b2i,a1,b1,a2,b2R,

|z1|=|z2|,则=

+=+

z1·=+=+=z2·,故C正确;

z1=1,z2=i,则|z1|=|z2|,

=1,=-1,故D错误.

10.已知集合M={m|m=in,nN*},其中i为虚数单位,则下列元素属于集合M的是(  )

A.(1-i)(1+i)B.

C.D.(1-i)2

答案 BC

解析根据题意,M=m|m=in,nN*},

n=4k(kN*)时,in=1

n=4k+1(kN)时,in=i

n=4k+2(kN)时,in=-1

n=4k+3(kN)时,in=-i,

M=-1,1,i,-i.

选项A中,(1-i)(1+i)=2M

选项B中,==-iM

选项C中,==iM

选项D中,(1-i)2=-2iM.

11.已知z1,z2C,下列命题正确的是(  )

A.|z1|2=

B.=(z2≠0)

C.若z1·z2=0,则z1,z2至少有1个为0

D.若z1,z2是两个虚数,z1+z2R,z1·z2R,则z1,z2为共轭复数

答案 BCD

解析z1=a+bi,z2=c+di,a,b,c,dR.

对于选项A,例如z1=i,则|z1|2=1,=-1,

显然|z1|2,故A错误;

对于选项B,因为z2≠0,

===+i,

可得=-i

通过网盘分享的文件:同步PPT课件等3个文件

链接: https://pan.baidu.com/s/1ZlSxnGdFezeT3YPAHstUhQ?pwd=4321 提取码: 4321 

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  1. CONNECT:[ UseTime:0.000578s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000827s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.003704s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000376s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000750s ]
  6. SELECT * FROM `set` [ RunTime:0.005398s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000792s ]
  8. SELECT * FROM `article` WHERE `id` = 464942 LIMIT 1 [ RunTime:0.024041s ]
  9. UPDATE `article` SET `lasttime` = 1770264319 WHERE `id` = 464942 [ RunTime:0.014682s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.009406s ]
  11. SELECT * FROM `article` WHERE `id` < 464942 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.020378s ]
  12. SELECT * FROM `article` WHERE `id` > 464942 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.011325s ]
  13. SELECT * FROM `article` WHERE `id` < 464942 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.075002s ]
  14. SELECT * FROM `article` WHERE `id` < 464942 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.200257s ]
  15. SELECT * FROM `article` WHERE `id` < 464942 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.111790s ]
0.557798s