又N在渐近线上,所以,所以, 因为点P在双曲线E: 所以,所以 所以,所以答案选择为D。 由题意,点M在渐近线上,点N在渐近线上,设 因为P,M恰为线段FN的三等分点,所以P为线段FM的中点,M为线段PN的中点 则即 又N在渐近线上,所以,所以, 因为点P在双曲线E: 所以,所以 所以就可以求离心率的值了。反馈 收藏 ...
All Swayam courses can be taken for free. Students can choose to pay a small fee (about $15) to sit a proctored exam in an exam center in India to earn a certificate of completion.These certificates can be used by students in India to earn academic credit. Indeed, universities can ...
(2)已知过点且互相垂直的两条直线分别与E交于点A,B与点C,D,若M,N分别为线段AB,CD的中点,求证:直线MN过定点。 相关知识点: 试题来源: 解析 【解答】 (1)∵双曲线的渐近线方程为 ∴, ∴ ∵ ∴ ∴ ∴ 得 ∴双曲线E的标准方程为:。 (2)证明: 由(1)知,则 ①当直线4B,CD的斜率都存在时,设 直...
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public Integer exam(){ return 98; } //有参数有返回值的方法 public String help(String name){ return "《" + name + "》"; } } 反射调用student中的方法对象end 输入一个类名,输入一个方法名,反射调用方法(如eat方法) START import java.lang.reflect.Method; ...
∴直线MN恒过定点(0,-1) 答:直线MN经过定点(0,-1)。(1)由椭圆,即 ,所以抛物线0)" data-width="188" data-height="29" class="exam-img-29 exam-img" data-size="2935" data-format="png" style="max-width:100%">的焦点到准线的距离,所以直接可以得出抛物线的方程;(...
representation, and machine organization. Across this spectrum of designs there m, however, a significant sharing of concepts. The aim of this palaer m to identify the concepts and relationships that exist both within and between the two areas of research. It does thin by examlmng data-driven...
分别交于MN两点,且,,则的渐近线方程是( ) A. B. C. D. 相关知识点: 试题来源: 解析解:由题意得 设0\right)" data-width="141" data-height="25" class="exam-img-25 exam-img" data-size="1817" data-format="png" style>,则∴ 根据双曲线的定义可以得到∴...
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double d = 12.34; QString str = QString("delta: %1").arg(d, 0, 'E', 3); // str == "delta: 1.234E+01" The '%' can be followed by an 'L', in which case the sequence is replaced with a localized representation of a. The conversion uses the default locale, set by QLocal...