过平面直角坐标系中的点P(4-3a,
)(a∈R)作圆x2+y2=1的两条切线PA,PB,切点分别为A,B,则数量积
的最小值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71ca0fcaa1c3130405d16a3b8737215f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/438d94560a7ac74e8655e4c9184b9d5a.png)
A.![]() | B.![]() | C.![]() | D.![]() |
更新时间:2019-02-04 08:39:30
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【推荐1】在
中,角
的边长分别为
,点
为
的外心,若
,则
的取值范围是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab609a6574633ebabcff3e73fa862081.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9a475fec8ded321e10a6697319fb975.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0188ed4044d91cfe29e5a044f7d61600.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbc932d96cbeffffd8c0e81db654cb93.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】
,中,
,在线段
上任取一点
,则
的面积小于
的概率是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34ff9d4fdd0d176042505b7aac016852.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5a9fffefb0ed5d30075753dfa98b353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2205cffebf8c4d5f81d15ed7b85c8936.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41322821ce31416fdac8dd6e0aa41c71.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐1】下列命题中,正确的是( )
A.![]() | B.![]() |
C.![]() | D.![]() |
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【推荐1】已知圆
过点
,
,
,点
在直线
上,过点
作圆
的两条切线,切点分别为
,
,则四边形
面积的最小值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/081cd41dab0f2a8f84b0e9f1df4843fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fab8a0cc6504aa4c3a38006f5394b4c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edb13bbc5335efc427f9c619a51dae3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d77f5191798242b7b9b88a75e17e4425.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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e7d9bc2c25d6f1f6ca08189e96c590e.png)
A.3 | B.![]() | C.4 | D.![]() |
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【推荐2】已知点P是直线
上的动点,过点P引圆
的两条切线PM,PN,M,N为切点,当PM的最小值为
时,则r的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a7e9b2c8fa0b6e26bee2b0077142beb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc1d3d6a325caadcf73530f7b21c26a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
A.2 | B.![]() | C.![]() | D.1 |
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