15-16高二下·上海浦东新·期中
名校
1 . 已知
是实系数一元二次方程
的虚根,记它在直角坐标平面上的对应点位
.
(1)若
在直线
上,求证:
在圆
:
上;
(2)给定圆
,则存在唯一的线段
满足:
①若
在圆
上,则
在线段
上;
②若
是线段
上一点(非端点),则
在圆
上,写出线段
的表达式,并说明理由;
(3)由(2)知线段
与圆
之间确定了一种对应关系,通过这种对应关系的研究,填写表一(表中
是(1)中圆
的对应线段).
表一:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e81e59019989b7dc2fb59b037ef6e010.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7383c643d74bb787f8f101830c12fe4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5aeaae6c694cd4bf7d0828353d451849.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5f00fdb0b1dfb21a2e192990b79be37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f281814a940820e52ec332185871e22f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52225f75cebeb64408d27837cec03b98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e383fcc122f267043fbafe0972bfb900.png)
(2)给定圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f333953d348a283b7e7824f16661645c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52225f75cebeb64408d27837cec03b98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5f00fdb0b1dfb21a2e192990b79be37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5f00fdb0b1dfb21a2e192990b79be37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52225f75cebeb64408d27837cec03b98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
(3)由(2)知线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae9ab1621cd729a18b2173e95d557376.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
表一:
线段![]() ![]() | ![]() |
![]() ![]() | |
![]() ![]() | |
线段![]() ![]() |
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