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已知双曲线的离心率为,若以(2,﹣1)为圆心,r为半径的圆与该双曲线的两条渐近线组成的图形只有一个公共点,则半径r=( )
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高三下学期数学《》真题及答案
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圆O1半径为1圆O2半径为2且|O1O2|=2动圆M.与圆O1圆O2都相切外切或内切则动圆圆心M.的
双曲线C.﹣=1a>0b>0的右焦点为F.若以点F.为圆心半径为a的圆与双曲线C.的渐近线相切则双曲
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双曲线C.:-=1a>0b>0的右焦点为F.c0以原点为圆心c为半径的圆与双曲线在第二象限的交点为A
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JohnAdams1735﹣1826 TheMassachusetts﹣bornHarvard﹣educatedAdamsbeganhiscareerasalawyer.ThenhebecameacriticofGreatBritain'sauthorityinAmericaandwasaleaderoftheAmericanRevolutionlater.From1789to1797AdamswasAmerica'sfirstvicepresident.HewaselectedinthePresidentialelectionof1796andservedasinglefour﹣yeartermasthesecondU.S.presidentfrom1797to1801. AndrewJackson1767﹣1845 BorninpovertyAndrewJacksonhadbecomeawealthyTennesseelawyerandrisingyoungpoliticianby1812whenwarbrokeoutbetweentheUnitedStatesandBritain.HisleadershipinthatconflictearnedJacksonnationalfameasamilitaryheroandhewouldbecomeAmerica'smostinfluentialpoliticalfigureduringthe1820sand1830s.AndrewJacksonbecamethenation'sseventhpresident1829﹣1837. JohnQuincyAdams1767﹣1848 JohnQuincyAdamsbeganhiscareerastheU.S.ministertotheNetherlandsin1794.AfterthattheyoungerAdamsrejoineddiplomaticserviceunderPresidentJamesMadison.AssecretaryofstateunderJamesMonroeAdamsplayedakeyroleindeterminingthepresident'sforeignpolicy.Hewentontowinthepresidencyinanelectionin1824andservedonlyoneterm. AbrahamLincoln1809﹣1865 AbrahamLincolnwasthe16thpresidentoftheUnitedStatesfrom1861untilhisshockingdeathin1865.HewasborninacottageandgrewupontheAmericanfrontiereducatedhimselfbyreadingborrowedbooksandworkedsplittingfencerailsandclerkinginageneralstoreandthenasacountrylawyerlongbeforehebecamepresident. 1WheredidJohnAdamsfinishhisuniversityeducation? A.Harvard. B.Oxford. C.CambridgeUniversity. D.UniversityofStAndrews. 2WhatmadeAndrewJacksonamilitaryhero? A.Hisleadershipinthewar. B.Hiswealthfromhisfamily. C.Hisgoodcareer. D.Hispoorfinancialconditions. 3Whocouldaffectthepresident'sforeignpolicy? A.JohnAdams. B.JohnQuincyAdams. C.AndrewJackson. D.AbrahamLincoln. 4Whatdothepersonsmentionedinthetexthaveincommon? A.Theyarehighlyeducated. B.Theyarelawyers. C.Theyarepoliticians. D.Theyarepeace﹣lovers.
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