解题方法
1 . 已知复平面上的点
对应的复数
满足
,设点
的运动轨迹为
.点
对应的数是0.
(1)证明
是一个双曲线并求其离心率
;
(2)设
的右焦点为
,其长半轴长为
,点
到直线
的距离为
(点
在
的右支上),证明:
;
(3)设
的两条渐近线分别为
,过
分别作
的平行线
分别交
于点
,则平行四边形
的面积是否是定值?若是,求该定值;若不是,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d8b9ad2fcfff3dd546c5fdbedfe6238.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e81e59019989b7dc2fb59b037ef6e010.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d9e97f066db90a8b341f8bc1cc3443d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d8b9ad2fcfff3dd546c5fdbedfe6238.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91edc7e2d4811f5ea6c01284cf00393a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e58bf28d4fde2909e1018e870e70baa9.png)
(1)证明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91edc7e2d4811f5ea6c01284cf00393a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5dead5c5455fcbf21c809120dca4787.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91edc7e2d4811f5ea6c01284cf00393a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9a2df68b4bc2f1773ccc4d4590079cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c88d9142df6ba8e43c1a93bd04a1362.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d8b9ad2fcfff3dd546c5fdbedfe6238.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a9a1a2d4399061fc9d8921e22e1771e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d8b9ad2fcfff3dd546c5fdbedfe6238.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91edc7e2d4811f5ea6c01284cf00393a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51b892bab45e209077e2ac309bcc6428.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91edc7e2d4811f5ea6c01284cf00393a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c3529e7875112e656eed532629c5d3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d8b9ad2fcfff3dd546c5fdbedfe6238.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c3529e7875112e656eed532629c5d3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/224150f5b61706dc52b162d76ee5e285.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f9f59db2b6f4b68d28271c9727afc0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4b5a39cff02408146d83d7704aa4d44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/449b78bc33d57b2972713b6029f39c32.png)
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解题方法
2 . 设M是由复数组成的集合,对M的一个子集A,若存在复平面上的一个圆,使得A的所有数在复平面上对应的点都在圆内或圆周上,且
中的数对应的点都在圆外,则称A是一个M的“可分离子集”.
(1)判断
是否是
的“可分离子集”,并说明理由;
(2)设复数z满足
,其中
分别表示z的实部和虚部.证明:
是
的“可分离子集”当且仅当
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33a2a51a8d747c5a61f259a3ddf3bd0e.png)
(1)判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6f12a019ea4cab2a4143b39043157ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e6670f3947ae0329e5d9788b96c50f8.png)
(2)设复数z满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c86a4bfb6dd4bafcbe3c5c1aaead277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aff32d9320e0d72844f155f5c2acedb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/739598c5b7f2c8a97353a987b7392536.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f77809bc2f616691dd7417b3d31df5d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fae53a4b5ae5f0288d4d1ed6b41a7b11.png)
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解题方法
3 . (1)求复数
的模的最小值;
(2)复数
,若
,
,
,求复数
对应的点的集合形成的图形的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f9770d52839a3d7c4034badba0a2c2a.png)
(2)复数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa701dc94f56378824f7b5ec2afa491c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61a0bcbd3c304589176a837ba79fb7ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/606ef9cb8c9c4f61ab2acc4c11fec693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af1d7f79603414b0bea06846041631af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e81e59019989b7dc2fb59b037ef6e010.png)
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解题方法
4 . 阅读下面问题的解法:
求复数
的模的取值范围.
解:
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/26/45f4c249-026c-4fd3-9492-1ffd76fc7cf9.png?resizew=181)
如图所示,设点A的坐标为
,点B的坐标为
,则
即为点A、B之间的距离
.
∵点B的轨迹为以O为圆心,半径为1的圆,∴
,因此复数
的模的取值范围是
.
试运用类似上面的解法解下列问题:求函数
的值域.
求复数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3441a58ede2f3bd780d0207c8047127.png)
解:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffe803d3c95c4d89ada302952dfccae1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/26/45f4c249-026c-4fd3-9492-1ffd76fc7cf9.png?resizew=181)
如图所示,设点A的坐标为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43d2ff9ced79c22ff48de8357b806412.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7265338f61b72fef35a0746c8b429876.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce0584993cfa0801d603ffca041ecf3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05da40a2d7dab5d6a003906ca19d4749.png)
∵点B的轨迹为以O为圆心,半径为1的圆,∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/946a7572a73a40b3af7a1a80722cc446.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3441a58ede2f3bd780d0207c8047127.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0691c8ee320d0f36d7122d3e5ab0b7ee.png)
试运用类似上面的解法解下列问题:求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/792b0cf62b3db17fc6ea267e0267f001.png)
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5 . 设复数
i,
i,记复数
与
分别对应复平面内的点
和
.
(1)根据复数及其运算的几何意义,求
和
两点间的距离;
(2)已知
(
为正实数)表示动点
的集合是以点
为圆心,
为半径的圆.那么满足条件
的点
的集合是什么图形?并求出该图形的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75407f5349719aba26f58213459793eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/813182be9cff514aaa94ab104764f0ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e81e59019989b7dc2fb59b037ef6e010.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adcc78b50e4eb2ef6076b0ef4fab732d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2e81521fc8e5fa253ba80fc764529d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42ef89df8e9fbdc2a61417637c5bc248.png)
(1)根据复数及其运算的几何意义,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d8b9ad2fcfff3dd546c5fdbedfe6238.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61b3284b97f803dce36872eb8ab805d9.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea79bfb107b4cb7175fdfc4ad2f78ac2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11bc05f41215f9894e11d1df0465751a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d8b9ad2fcfff3dd546c5fdbedfe6238.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61b3284b97f803dce36872eb8ab805d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11bc05f41215f9894e11d1df0465751a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d348ab8205204b0dec8c556e945f5c0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d8b9ad2fcfff3dd546c5fdbedfe6238.png)
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