抛物线一个特征量的延拓

来源 :数学教学研究 | 被引量 : 0次 | 上传用户:wqfzqgkvbavba
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
高中数学新教材(人教版)第二册(上)第133页习题:过抛物线y2=2px(p>0)的焦点F的直线与抛物线相交于A、B两点,自A、B向准线作垂线,垂足分别为A'、B',求证:∠A'FB'=90°.
其他文献
The Citrus tristeza virus (CTV) uses 3 silencing suppressor genes, p20, p23 and p25, to resist the attacks from its Citrus hosts. Inactivating these genes is ther
RNA sequencing of the sensitive GH01 variety of Brassica napus L. seedling roots under 12 h of waterlogging was compared with previously published data of the z
Goosegrass is one of the worst agricultural weeds on a worldwide basis. Understanding of its interference impact in crop field will provide useful information f
1"问答式"课堂教学的弊端可喜的是,那种以教师为中心,完全"灌输性"的、"独白式"的数学课堂教学现象,目前已经很难见到了.但是现在的数学课堂教学又多呈现为一种典型的"问答式
The effects of light intensity on photosynthesis and photoprotective mechanisms under progressive drought were studied on apple trees (Malus domestica Borkh.) Fuj
基地班是对跨出专业范围、学科与学科之间、专业与专业之间交叉培养综合性人才的改革和探索.它对改变以往专业划分过细不利于培养综合素质人才的局面,实施全面素质教育是有益
This paper examines the U.S. meat demand impacts of the announced outbreaks of bovine spongiform encephalopathy(BSE) and avian influenza(AI). Findings indicate
Goosegrass is a worst grass weed in orchards and turf.The increased use of glyphosate for goosegrass control has led to the occurrence of many resistant populat
Salinity is one of the major abiotic stresses limiting crop growth and yield.This study investigated the underlying mechanisms of Trichoderma asperellum Q1 in p