已知直线
和
的交点
在第四象限,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2233e72cc94e0d8e7111bb3c59c05d63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c3e35cdfbf90ac67e7db0d9eb3d93ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
更新时间:2017-12-05 09:42:28
|
【知识点】 由直线的交点坐标求参数
相似题推荐
解答题-问答题
|
适中
(0.65)
解题方法
【推荐1】已知直线
的方程分别是
,点
的坐标为
.过点
的直线
的斜率为
,且与
分别交于点![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1af3be509819cedd22f0ebb04e59e699.png)
的纵坐标均为正数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/913b7537e011acfeec11952731351388.png)
(1)若
,且
为线段
中点,求实数
的值及
的面积;
(2)是否存在实数
,使得
的值与
无关?若存在,求出所有这样的实数
;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/298a499784e70cd8487c97dd5da5b484.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35ae51a31048c032272dc0d531b670d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69b93b1aca2f6d74a84e04eaef8e211b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ec8d41d480faa56615c88703b244955.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69b93b1aca2f6d74a84e04eaef8e211b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/baa0a6cfe799d0ffc4666103fe0b17a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1af3be509819cedd22f0ebb04e59e699.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/392c2d2cf5432b1aec405b6aa6571cd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/913b7537e011acfeec11952731351388.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b02f266bd253738e315e84231235f0d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69b93b1aca2f6d74a84e04eaef8e211b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71bd94db69bac8b670ab113ce9be46ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40bd8b071b24e92e0b1fd38101ffe400.png)
(2)是否存在实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2caac14fd6f2f4d683f734d6a1b4a155.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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解答题-证明题
|
适中
(0.65)
名校
【推荐2】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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