名校
1 . 甲、乙、丙三人用擂台赛形式进行训练.每局两人单打比赛,另一人当裁判.每一局的输方去当下一局的裁判,而由原来的裁判向胜者挑战.半天训练结束时,发现甲共打
局,乙共打
局,而丙共当裁判
局.那么整个比赛的第
局的输方
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8da45c443af7994a26ffa9d8894e7262.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea1834490aacbee800ed5721312f4be1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3304e23f3b0f9569c4140ca89b6498.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d07ae0b4264da6a8812454ffd2f20d94.png)
A.必是甲 | B.必是乙 | C.必是丙 | D.不能确定 |
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2014高三·甘肃·竞赛
2 . 已知双曲线
的离心率为2,过点
、斜率为1的直线
与双曲线
交于
、
两点且
,
.
(1)求双曲线方程.
(2)设
为双曲线
右支上动点,
为双曲线
的右焦点,在
轴负半轴上是否存在定点
,使得
?若存在,求出点
的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01fb04034d7d8a2741038afb758df50a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ec638e7df7ab8ad8f9558c8cb8e9e87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.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/c635759dd95a80c3ba6f212319b2c73d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55be6a3f46cf1d6700fc5f2a79e3ffd1.png)
(1)求双曲线方程.
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.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/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/352a208a70e8cc21a8e26cb029574cf4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
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3 . 把16本相同的书全部分给4名学生,每名学生至少有一本书且所得书的数量互不相同,则不同的分配方法种数为__________ .(用数字作答)
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4 . 设
、
为椭圆
:
的左、右焦点.若椭圆
上存在一点
,使得
,则椭圆离心率
的取值范围是__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dd54b9df3402ad91e2d34c40efe0c7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2427943a38dcd93c9ec9b735ffc9fe5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/168b3e4b1d6f04226fa2687a72a268b4.png)
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5 . 如图,在三棱锥中,SA=SB=AB=BC=CA=6,且侧面ASB⊥底面ABC,则三棱锥S-ABC外接球的表面积为
![](https://img.xkw.com/dksih/QBM/2018/12/10/2093858078851072/2094692237688832/STEM/5138cf6232b14120a33ecf6908765653.png?resizew=126)
![](https://img.xkw.com/dksih/QBM/2018/12/10/2093858078851072/2094692237688832/STEM/5138cf6232b14120a33ecf6908765653.png?resizew=126)
A.60π | B.56π | C.52π | D.48π |
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6 . 若对任意的正整数
,集合
的任意
元子集中,总有三个元素两两互素.求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/123bd43b286734bb850c4b8d2ff43432.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8715a3f984d2627afd7c40c61347b7cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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7 . 已知锐角
的外接圆半径
的垂心、外心分别为
,联结
与
的延长线交于点
.求:
(1)凹四边形
面积;
(2)
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9178fc8b5d65aa75fa9196294a0db7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8114df4ae55dc4bc61f4e4b034a9d375.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26ff9f086f487c64fec4ba4c143e8adc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f090261333a1a126d3831f42748d48b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(1)凹四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a86cd1dc52441a24ddd9cc7c1c96285c.png)
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8 . 已知
(
为自然对数的底数).证明:
(1)
恒成立;
(2)
对一切正整数
均成立.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cd5a5dae0430248ab1f5b2ec3418977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/168b3e4b1d6f04226fa2687a72a268b4.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e9c599e8d420006448905acec2b8234.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91979f56279f46f2d0c910f3dd7b35a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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9 . 如图,AB、PA、PBC分别为⊙O的切线和割线,切点A是BD的中点,AC、BD相交于点E,AB、PE相交于点F,直线CF交⊙O于另一点G、交PA于点K.
![](https://img.xkw.com/dksih/QBM/2018/12/10/2093858078851072/2094692238008320/STEM/13256ee9e28d41c2b8e932dbeae5c66c.png?resizew=317)
证明:(1)K是PA的中点;(2)
..
![](https://img.xkw.com/dksih/QBM/2018/12/10/2093858078851072/2094692238008320/STEM/13256ee9e28d41c2b8e932dbeae5c66c.png?resizew=317)
证明:(1)K是PA的中点;(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf12f102fb4d9aba7097f5885f967f25.png)
您最近一年使用:0次