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已知F为双曲线C:(a>0,b>0)的左焦点,直线l经过点F,若点A(a,0),B(0,b)关于直线l对称,则双曲线C的离心率为( )
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高二下学期数学《》真题及答案
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过双曲线的焦点与双曲线实轴垂直的直线被双曲线截得的线段的长称为双曲线的通径其长等于ab分别为双曲线
已知双曲线a>0b>0的左右顶点分别为AB点F为双曲线C的左焦点过点F作垂直于x轴的直线分别在第二第
已知F1F2分别是双曲线-=1a>0b>0的左右焦点P为双曲线右支上的任意一点.若=8a则双曲线的离
已知双曲线=1的离心率为2焦点到渐近线的距离等于过右焦点F2的直线l交双曲线于A.B.两点F1为左焦
如图双曲线a>0b>0的离心率为F1F2分别为左右焦点M.为左准线与渐近线在第二象限内的交点且.Ⅰ求
已知双曲线-=1的离心率为2焦点到渐近线的距离等于过右焦点F2的直线l交双曲线于A.B.两点F1为左
已知双曲线E.的中心为原点F.30是E.的焦点过F.的直线l与E.相交于A.B.两点且AB的中点为N
已知双曲线﹣=1a>0b>0的左右顶点分别为AB.右焦点为F过点F且垂直于x轴的直线l交双曲线于MN
@B.右焦点为F,过点F且垂直于x轴的直线l交双曲线于M,N两点.P为直线l上一点,当∠APB最大时,点P恰好在M(或N)处,则双曲线的离心率为( )
A.
B.
2
已知双曲线直线l过其左焦点交双曲线左支于
B.两点,且|AB|=4,F.
2
为双曲线的右焦点,△AB
的周长为20,则m的值为( ) A.8
9
16
20
已知双曲线的右焦点为F直线l经过点F且与双曲线的一条渐近线垂直直线l与双曲线的右支交于不同两点AB
F.1F.2分别是双曲线-=1a>0b>0的左右焦点过F.1的直线l与双曲线的左右两支分别交于A.B
已知中心在原点的双曲线C.的右焦点为20左顶点为.1求双曲线C.的方程2若直线y=kx+mk≠0m≠
已知双曲线-=1a>0b>0的离心率为2焦点到渐近线的距离等于过右焦点F2的直线l交双曲线于A.B.
已知双曲线的右焦点为F直线l经过点F且与双曲线的一条渐近线垂直直线l与双曲线的右支交于不同两点AB
已知双曲线C.-=1直线l过其左焦点F.1交双曲线左支于
,
两点,且|AB|=4,F.
2
为双曲线的右焦点,△ABF
2
的周长为20,则m的值为( ) A.8B.9
16
20
双曲线的左顶点为CA为双曲线第一象限上的点直线OA交双曲线于另一点B双曲线左焦点为F连结AF交BC延
2
3
已知F为双曲线Ca>0b>0的左焦点直线l经过点F若点Aa0B0b关于直线l对称则双曲线C的离心率
已知双曲线-=1b∈N*的左右两个焦点为F.1F.2P是双曲线上的一点且满足|PF1||PF2|=|
已知是双曲线的左右焦点若点关于直线的对称点也在双曲线上则该双曲线的离心率为___.
已知双曲线-=1a>0b>0的右焦点为F.若过点F.且倾斜角为30°的直线与双曲线的一条渐近线平行则
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计算=
如图所示光滑斜面倾角θ=30°另一边与地面垂直斜面顶点有一光滑定滑轮物块A和B通过不可伸长的轻绳连接并跨过定滑轮轻绳与斜面平行A的质量为m开始时两物块均静止于距地面高度为H处B与定滑轮之间的距离足够大现将AB位置互换并由静止释放重力加速度为g求 1B物块的质量 2交换位置释放后B着地的速度大小
以双曲线x2﹣的焦点为顶点离心率为的双曲线的渐近线方程是
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函数y=+的值域为
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为研究需要统计了两个变量xy的数据情况如表 其中数据x1x2x3…xn和数据y1y2y3…yn的平均数分别为和并且计 算相关系数r=﹣0.8回归方程为=x+有如下几个结论 ①点必在回归直线上即=b+ ②变量xy的相关性强 ③当x=x1则必有=y1 ④b<0 其中正确的结论个数为
下列说法正确的是
在等差数列{an}中an>0a7=a4+4Sn为数列{an}的前n项和S19=.
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如图所示一列振幅为10cm的简谐横波其传播方向上有两个质点P和Q两者的平衡位置相距3m.某时刻两质点均在平衡位置且二者之间只有一个波谷再经过0.3sQ第一次到达波峰.则下列说法正确的是 E.
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