已知曲线
与曲线
恰好有三个不同的公共点,则实数
的取值范围是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0987c785e4b096befe994809cce880f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61ee1d4fb9793b78b66aa2438b86cd1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
更新时间:2022-05-31 12:22:37
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【推荐1】曲线C为:到两定点
、
距离乘积为常数16的动点P的轨迹.以下结论正确的个数为______ .
(1)曲线C一定经过原点
(2)曲线C关于x轴对称,但不关于y轴对称
(3)
的面积不大于8
(4)曲线C在一个面积为60的矩形范围内.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/accf35598ee054f1bf8b6584641d6d85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4b2bb30137f92479d11827ee769f001.png)
(1)曲线C一定经过原点
(2)曲线C关于x轴对称,但不关于y轴对称
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3de0022a7f2e122492f1483e4d3cccba.png)
(4)曲线C在一个面积为60的矩形范围内.
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解题方法
【推荐2】在平面直角坐标系
中,动点
到两坐标轴的距离之和等于它到定点
的距离,记点
的轨迹为
.给出下面四个结论:①曲线
关于原点对称;②曲线
关于直线
对称;③点
在曲线
上;④在第一象限内,曲线
与
轴的非负半轴、
轴的非负半轴围成的封闭图形的面积小于
.其中所有正确结论的序号是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aee82283f06cedef32eb15b87964f5d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29343388ca8b33dc98325e65382b38a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d77f5191798242b7b9b88a75e17e4425.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b47489a68843a5ee6f542c442b0ea547.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
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解题方法
【推荐1】已知
为坐标原点,
,
.若点
满足
.记点
的轨迹为曲线
,且
与曲线
在第一象限的交点为
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e72358a12f923519a407a46c07f5d33.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5544274135a5332a1403741c8c0bd2dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/788a45292b81b3632fda1f9df89308fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cad245ab26aecb331b737acaad7dbf8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0059cb1f331ba2fdfa8b089d4557401.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e72358a12f923519a407a46c07f5d33.png)
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解题方法
【推荐2】已知曲线
及点
,若曲线
上存在相异两点
,其到直线
的距离分别为
和
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/011187ff433fdb528729d89216ab4e6a.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5baef94fd822659280845bf3dc7c920.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8748dc55e2f45bc37fc4d84d7310f79.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab609a6574633ebabcff3e73fa862081.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/958e252a7e8d02eba708cc7380a86d68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4dfec890cdfdda355e19463f3be813.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca9e36c5987d6730e846753e0552c7d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/011187ff433fdb528729d89216ab4e6a.png)
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