名校
解题方法
1 . 已知复数
的共轭复数记为
,对于任意的两个复数
,
,与下列结论错误的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e81e59019989b7dc2fb59b037ef6e010.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fcfebd9f5a57036e6df6b6e14865da3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af68f652b4c13657ffddf3c9e7eb262b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa224ed9be8766a4d0b5138bd57de0f0.png)
A.若复数![]() |
B.若复数![]() ![]() ![]() |
C.![]() |
D.![]() |
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2024高三·全国·专题练习
2 . 下面是应用公式
,求最值的三种解法,答案却各不同,哪个解答错?错在哪里?已知复数
为纯虚数,求
的最大值.
解法一:∵
,
又∵
是纯虚数,令
(
且
),
∴
.
故当
时,即当
时,所求式有最大值为
.
解法二:∵
,∴
.
故所求式有最大值为
.
解法三:∵
,
又∵
为纯虚数,∴
,
∴
.
故所求式有最大值为
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b24b1f5fe3cf65914e79532f4d2b23d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e81e59019989b7dc2fb59b037ef6e010.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e3958fbc45ee3e72d9a6dc37a8f9474.png)
解法一:∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8201b70b4e9a66d8843dff2e728199c.png)
又∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e81e59019989b7dc2fb59b037ef6e010.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cdecf72a044cbeb148db4e743c52514.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dd0914dc4d4c7f75710ff460a286fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b03b011f69dfc5262a3d82f64676739b.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7794d59445d4545e6fd58d484fef86d3.png)
故当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a3c442579603164f3fc19458677d307.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/128730d6a25a11ed9b6b0f0e7f4f0433.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b7e9bd225e22d3c95a681720114056f.png)
解法二:∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a61f82d3db0076d8d07b901691021f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c186e2d43b0f52ff872a3613d56f8b1.png)
故所求式有最大值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/934c6d8e32b31bdcfa263c705b95182b.png)
解法三:∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62981b55a133db7d326bef9d3e73b4c2.png)
又∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e81e59019989b7dc2fb59b037ef6e010.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed98359cf005d2b49ec68f55d1f87c6e.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c56d0e6036bae5d5a30c2a1f9fff19a0.png)
故所求式有最大值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c296c04fc52c07364a234c0ac6233022.png)
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3 . 已知复数
,
,
,分别记作
,
,
,即
,
,
,求证:
(1)
;
(2)
;
(3)
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e840ea0100bed41c779ba4d30fee7670.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4160c2acea59936bd06a7d7a7aa4514.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/491ff1d34a2e0b5c35ec5b482f9e6dc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af68f652b4c13657ffddf3c9e7eb262b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa224ed9be8766a4d0b5138bd57de0f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a67a742d2a43e907fb1c3a1bdf1d6a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7769a9ed79bc3d423437e1ed98b033af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/935a9ada9a7372c5d296243c435a3c73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf111e7aa8784c1c67b30e1a2ad3671c.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f06ca9d2cc05ecc6fbe8022f12002632.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e866b8803b38e56c63e811cde5885cf.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dc05d7f017b7a96b162888d4162254c.png)
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名校
4 . 欧拉是
世纪最伟大的数学家之一,在很多领域中都有杰出的贡献.由《物理世界》发起的一项调查表明,人们把欧拉恒等式“
”与麦克斯韦方程组并称为“史上最伟大的公式”.其中,欧拉恒等式是欧拉公式:
的一种特殊情况.根据欧拉公式,
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b837fd9c52f60bfb3b6852733abc790.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96a4d35f02c7125868dd4ca2533325d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5aa584db159b0f9bfae801d0134393b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3b920bda8f45e4a7bde9a097dab79bf.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2022-04-01更新
|
1767次组卷
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5 . 以下四个关于复数的结论:①任意两个复数不能比大小;②
;③
;④复数
且![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfc330a9671536bc46fa244b4ceebcf9.png)
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a00067021ce933d112a52baff69b13f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e2e0d25a03a3b83b219293bcf56ce2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0babf9d053d17364a69f2fb4a7eb3caa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfc330a9671536bc46fa244b4ceebcf9.png)
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21-22高一·全国·课后作业
6 . 复数的加、减法运算法则
设
,
则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffe82a3f7f76832113ecf0e00803a589.png)
____________ ,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35aa5256411e4bfe86bab7783a9022a6.png)
_____________ .
复数加法的运算律
(1)交换律:____________ .
(2)结合律:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12e3811125e6000e04efaaa746377905.png)
___________ .
复数加、减法的几何意义
如图,设在复平面内复数
对应的向量分别为
,以
为邻边作平行四边形,则与
对应的向量是_________ ,与
对应的向量是_____________ .
设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f0223af3b0dacb162f5a1fb7a01ee89.png)
则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffe82a3f7f76832113ecf0e00803a589.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35aa5256411e4bfe86bab7783a9022a6.png)
复数加法的运算律
(1)交换律:
(2)结合律:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12e3811125e6000e04efaaa746377905.png)
复数加、减法的几何意义
如图,设在复平面内复数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90d860cb86e1467ac24010aecfc7a425.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a48ccc06cf3f8dc889e2cfc6b39977b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95aa323fbc002e36c732051858419868.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e34b88f343ca5a4c29057465541b9cf4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e4e2b866b0043a32fc78326553841d3.png)
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7 . 如图所示,已知复数
,
所对应的向量
,
,它们的和为向量
.请根据两个向量相加的运算写出对应的复数运算过程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7769a9ed79bc3d423437e1ed98b033af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc358e9ddfe2e61a2f3ebd4273de848c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/612af62da1c0563e32852f2e8122ee1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43c6f2f26d1cd1232a8902de0177e395.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4407c0b2e5febf70f610bd00067f105.png)
![](https://img.xkw.com/dksih/QBM/2021/12/1/2863252955602944/2863403750727680/STEM/59180b8be78041e4af71565ea581733d.png?resizew=261)
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