若过原点
的动直线
将圆
分成的两部分面积之差最大时,直线
与圆
的交点记为
、
;
将圆
分成的两部分面积相等时,直线
与圆
的交点记为
、
;则四边形
的面积为_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ea4c640206c259fb4be64f335222f78.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
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20-21高二上·湖南长沙·开学考试 查看更多[2]
更新时间:2020-09-16 16:38:49
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【推荐1】已知双曲线
的渐近线被圆
截得的弦长为
,则该双曲线的离心率为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5ec7fa23be9cbe9a50607ea6bc8a4ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68ecf7240772bb21d8ed901c3077e35d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
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【推荐2】古希腊数学家阿波罗尼斯发现如下结论:“平面内到两个定点A,B的距离之比为定值m(m≠1)的点的轨迹是圆”.在平面直角坐标系中,已知点A(—2,1),B(1,1),点P满足
,设点P的轨迹为圆M,点M为圆心,则下列说法正确的是___________ .
①圆M的方程为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f41935aeca2823e94e7cf1a5d3225fbe.png)
②直线
与圆M相交于D,G两点,且
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/239ea0e903fbb4c8ce04133b9969578c.png)
③若点Q是直线
上的一个动点,过点Q作圆M的两条切线,切点分别为E,F,则四边形QEMF的面积的最小值为24
④直线l3:
)始终平分圆M的面积,则
最小值是11.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a18434565f749f0c7722151129e695f.png)
①圆M的方程为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f41935aeca2823e94e7cf1a5d3225fbe.png)
②直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/583ece2d8450f180661fd683522286e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98584401faed07ead3040c7df851891b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/239ea0e903fbb4c8ce04133b9969578c.png)
③若点Q是直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b32f19b0af8ef959c952d38427968337.png)
④直线l3:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c42ccce8c40837e5e76c94c116a429a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c49a1175f22e70d31155587d3bcac62e.png)
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解题方法
【推荐1】已知点Q是直线
:
上的动点,过点Q作圆
:
的切线,切点分别为A,B,则切点弦AB所在直线恒过定点___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09324568f2f3995b2f932e66ee5926ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5f5d967ad135991b6075ee45df55643.png)
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【推荐2】已知点
为直线
上的动点,过点
引圆
的两条切线,切点分别为
,则点
到直线
的距离的最大值为_________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d1cb41222d27da278a922db1cd5cb34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f240cccaf24af8a796abb95cb42be52e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e54822a1c8cd1ad8c5b84e1c33ed9bfc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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