1 . 已知
,若复数
(
为虚数单位)为实数,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47d1fa6f0aec8a8e0fc3949ab028a2f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/995ec593baa4ef50b6d87c78380953d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02a437d6301c9c03f0f864c068f32ce4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c05b9832b09731a574d4a4adf7448de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47d1fa6f0aec8a8e0fc3949ab028a2f8.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2020高三·全国·专题练习
2 . 下面是关于复数z=2-i的四个命题
;
;
的共轭复数为
;
的虚部为
.其中真命题为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1560c96da2ce62c48dfd34996b71316.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afa0614392a30cbbdd2f92c07fefc238.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4cf99f3611a8f2a24fd81e7b0d2053b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5e24854678cf15fb3f035ecdf339920.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2332cc5c1b798da1422bf0a55fcb98d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acbc6a613224461ade69362d46550474.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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10-11高二下·浙江杭州·阶段练习
3 . 实数
满足等式
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c57bbef89a37f1a3808c0ceeac0c22.png)
_____________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/823b61edeefc86d390ce1556a48a71b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c57bbef89a37f1a3808c0ceeac0c22.png)
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2014·福建福州·一模
4 . “实数
”是“复数
(
为虚数单位)的模为
”的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24f67b42c41351f38181c13176527677.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/863a8b3a0dd3d27b91212e4d7a3de066.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
A.充分非必要条件 | B.必要非充分条件 |
C.充要条件 | D.既非充分条件又不必要条件 |
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名校
5 . 若复数
为纯虚数,且
(
为虚数单位),则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e81e59019989b7dc2fb59b037ef6e010.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7081ac76e5ac1e22e848eec143578f1c.png)
__________________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e81e59019989b7dc2fb59b037ef6e010.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a20c703d74ff6094fadba7b62faf1a08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c05b9832b09731a574d4a4adf7448de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e81e59019989b7dc2fb59b037ef6e010.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7081ac76e5ac1e22e848eec143578f1c.png)
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2020高三·全国·专题练习
名校
6 . 已知复数z满足:z2=3+4i,且z在复平面内对应的点位于第三象限.
(1)求复数z;
(2)设a∈R,且
,求实数a的值.
(1)求复数z;
(2)设a∈R,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3af4ef05f80f4c4e7cf6a5c962ffedeb.png)
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2012·全国·一模
7 . 设复数
,
,
,则
的最大值是
![](https://img.xkw.com/dksih/QBM/2012/8/15/1570971076452352/1570971081457664/STEM/2a4ec8bf5135452a8d4b677a533463be.png)
![](https://img.xkw.com/dksih/QBM/2012/8/15/1570971076452352/1570971081457664/STEM/6e33a41546674868adfb9cf6a500de88.png)
![](https://img.xkw.com/dksih/QBM/2012/8/15/1570971076452352/1570971081457664/STEM/9b643919cfc74bdf9ee64203dffaaff5.png)
![](https://img.xkw.com/dksih/QBM/2012/8/15/1570971076452352/1570971081457664/STEM/71287bcde15a47f58fa33d8dd663e94d.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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