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已知a为函数f(x)=x3﹣3x的极小值点,则a=( )
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高三上学期数学《》真题及答案
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设函数fx=xex则
x=1为f(x)的极大值点
x=1为f(x)的极小值点
x=-1为f(x)的极大值点
x=-1为f(x)的极小值点
已知x=2是函数fx=x3-3ax+2的极小值点那么函数fx的极大值为.
已知函数fx=x3-x2-x+a且fx的极小值为1则fx的极大值为.
函数fx=x3-3x2+1在x=处取得极小值.
设函数fx=xex则
x=1为f(x)的极大值点
x=1为f(x)的极小值点
x=-1为f(x)的极大值点
x=-1为f(x)的极小值
函数fx在-∞+∞内有定义又x=x0点为函数的极大值点则
x=x
0
点是f(x)的驻点
x=-x
0
是-f(-x)的极小值点
f(x)≤f(x
0
)(-∞<x<+∞)
x=-x
0
是-f(x)的极小值点
已知a函数fx=x3-12x的极小值点则a=
-4
-2
4
2
已知a函数fx=x3-12x的极小值点则a=
-4
-2
4
2
已知函数fx=x3-px2-qx的图象与x轴切于10点则fx的
极大值为
,极小值为0
极大值为0,极小值为-
极小值为-
,极大值为0
极小值为0,极大值为
已知函数fx=x3+ax2+bx+c当x=﹣1时fx的极大值为7当x=3时fx有极小值.求1abc的
已知函数fx=mx3﹣3x2+n﹣2m≠0.1若fx在x=1处取得极小值1求实数mn的值2在1的条件
函数fx=x3﹣3x2+1在x=_________处取得极小值.
函数fx=x3﹣3x2+1在x=处取得极小值.
已知函数y=fx的导函数y=f′x的图象如图则
函数f(x)有1个极大值点,1个极小值点
函数f(x)有2个极大值点,2个极小值点
函数f(x)有3个极大值点,1个极小值点
函数f(x)有1个极大值点,3个极小值点
函数y=x3-3x2-9x-2
极大值5,极小值-27
极大值5,极小值-11
极大值5,无极小值
极小值-27,无极大值
已知实数a满足1<a≤2设函数fx=x3-x2+ax.Ⅰ当a=2时求fx的极小值Ⅱ若函数gx=4x3
设函数fx的定义域为R.x0x0≠0是fx的极大值点以下结论一定正确的是
∀x∈R.,f(x)≤f(x0)
-x0是f(-x)的极小值点
-x0是-f(x)的极小值点
-x0是-f(-x)的极小值点
设函数fx=+lnx则
x=
为f(x)的极大值点
x=
为f(x)的极小值点
x=2为 f(x)的极大值点
x=2为 f(x)的极小值点
函数y=x3-3x2-9x-2
极大值为5,极小值为-27
极大值为5,极小值为-11
极大值为5,无极小值
极大值为-27,无极小值
已知函数fx=x3+ax2+bx+4x∈R.在x=2处取得极小值.1若函数fx的极小值是-4求fx2
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能够说明“在某个区间ab内如果函数y=fx在这个区间内单调递增那么f'x>0恒成立”是假命题的一个函数是.写出函数表达式和区间
a=2b=3c=5则abc的大小关系为
为调查某公司五类机器的销售情况该公司随机收集了一个月销售的有关数据公司规定同一类机器销售价格相同经分类整理得到下表 利润率是指一台机器销售价格减去出厂价格得到的利润与该机器销售价格的比值. Ⅰ从该公司本月卖出的机器中随机选一台求这台机器利润率高于0.2的概率 Ⅱ从该公司本月卖出的销售单价为20万元的机器中随机选取2台求这两台机器的利润率不同的概率 Ⅲ假设每类机器利润率不变销售一台第一类机器获利x1万元销售一台第二类机器获利x2万元…销售一台第五类机器获利x5依据上表统计数据随机销售一台机器获利的期望为Ex设=试判断Ex与的大小.结论不要求证明
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某几何体的三视图如图则它的外接球的表面积为
SeveralweeksagoourheadmasterMr.GauditoldusthatourschoolhadbeenchosentocompeteonSmartAleck﹣agameshowwhichmybestfriendCarlaandIbothlove.Carlahasagoodimagination1Iknowalotofhistory.Sowethoughtwe'dbegood2fortheteam. AfewdayslaterMr.Gaudiheldameetingwitheveryoneinterestedinthe3.HetoldusthatSmartAleckusesafivememberteam.Healsosaidthatthreemorepeoplewouldbeneededasbackup替补.4fourtimesthatmanystudentswereatthemeeting.SoMr.Gaudisaidwewouldhavea5amongallthestudentspresentandthetop6scorerswouldbecometheteamandthebackup.Everybodyagreedthatthiswasa7waytodecide. Yesterdayallofthehopefulswenttothedininghallafterschool.Wewouldhaveto8thestartingline﹣up阵容.Mr.Gaudiactedasthe9.Afteracoupleofhoursallthe10ontheteamweresetexceptone.CarlaandI11forthatlastposition.Wehadtoholdaone﹣on﹣onecompetition12thetwoofus.Thewinnerwouldbeontheteamandtheloserwouldbethe13. Midwaythroughourtwo﹣personcompetitionIwasstartingtopullahead.14IsawthelookonCarla'sface.IwaitedforasecondandknewwhatIhadtodo.AsmuchasIwantedtobeonSmartAleckCarlawanted15evenmore.SostartingwithmynextquestionIheldbackandletCarla16justbyalittlebit.Herexpressionasshe17shewouldbeontheshowmadeupformynotbeingontheteam.AndsinceIwillgoasbackupI'llstillhavethe18ofseeingtheshowupclose. WasI19bynottryingashardasIcould?Idon'tthinkso.NoonenoticedandCarlaandIdidn't20it.Itwon'thurttheteambecauseCarlawillbeaverygoodcompetitorontherealshow.Ithinkthatmakingmybestfriendhappywastherightthingtodo. 1A.but B.or C.so D.and 2A.pairs B.choices C.leaders D.fans 3A.course B.work C.play D.show 4A.Luckily B.Unluckily C.Importantly D.Hopefully 5A.direction B.discussion C.competition D.conversation 6A.five B.three C.two D.eight 7A.special B.hard C.funny D.fair 8A.decide B.draw C.push D.make 9A.headmaster B.coach C.host D.headteacher 10A.places B.rules C.names D.orders 11A.tied B.clapped C.cried D.returned 12A.of B.on C.between D.among 13A.backup B.audience C.cheerleader D.member 14A.Still B.Never C.Then D.Again 15A.us B.it C.me D.her 16A.wait B.turn C.move D.win 17A.accepted B.realized C.considered D.refused 18A.laughter B.sadness C.fun D.change 19A.coming B.refusing C.helping D.cheating 20A.mean B.plan C.regret D.say
函数y=3sinx+4cosxx∈R的值域是
在△ABC中角ABC的对边分别为abca=3. Ⅰ求c的值 Ⅱ若D为BC边上的点并且求∠ADB.
假如你是李华你的英国笔友Peter来信说近期要来北京希望你为他设计一个旅行计划推荐一些有中国特色的活动.请根据以下提示写一封回信.内容要点 TravelPlan 注意1.开头语和结束语已经为你写好不计入总词数2.可适当增加细节以使行文连贯 3.文中不能出现考生真实个人信息 4.词数100左右. DearPeter I'mhappytohearyou'recomingtoBeijing. Lookingforwardtomeetingyousoon! Yours LiHua
在直三棱柱ABC﹣A1B1C1中∠ABC=90°AB=BC=1BB1=2. 1求异面直线B1C1与A1C所成角的大小 2求直线B1C1与平面A1BC的距离.
执行如图所示的程序框图输出的s值为
如果存在常数a使得数列{an}满足若x是数列{an}中的一项则a﹣x也是数列{an}中的一项称数列{an}为“兑换数列”常数a是它的“兑换系数”. 1若数列236mm>6是“兑换系数”为a的“兑换数列”求m和a的值 2已知有穷等差数列{bn}的项数是n0n0≥3所有项之和是B求证数列{bn}是“兑换数列”并用n0和B表示它的“兑换系数” 3对于一个不少于3项且各项皆为正整数的递增数列{cn}是否有可能它既是等比数列又是“兑换数列”给出你的结论并说明理由.
某地拟建造一座体育馆其设计方案侧面的外轮廓线如图所示曲线AB是以点E为圆心的圆的一部分其中E0t0<t≤25GF是圆的切线且GF⊥AD曲线BC是抛物线y=﹣ax2+50a>0的一部分CD⊥AD且CD恰好等于圆E的半径. 1若CD=30米米求t与a的值 2若体育馆侧面的最大宽度DF不超过75米求a的取值范围.
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已知椭圆Ma>b>0的长轴长为6且经过点过点P并且倾斜角互补的两条直线l1l2与椭圆M的交点分别为BC点B在点C的左侧点E﹣70.Ⅰ求椭圆M的方程Ⅱ求证四边形PEBC为梯形.
过点M20的直线l与抛物线Cy2=2pxp>0交于AB两点O为坐标原点OA⊥OB.1求p的值2若l与坐标轴不平行且A关于x轴的对称点为D求证直线BD恒过定点.
设{an}是等比数列且a2a4=a5a4=27则{an}的通项公式为.
WhenHuangLizhitookherfirstclassinAfricansociologyattheUniversityoftheWitwatersrandinSouthAfricainFebruaryherprofessoraskedherandherclassmateswhatimpressesthemmostwhenitcomestoAfrica. UnexpectedlyHuang31foundthatwordslikepovertyandsafari﹣negativewordsthatwereoftenassociatedwiththecontinentinmediareports﹣werethekindoftermsherAfricanclassmatesdidn'twanttohear.InsteadtheypreferredtohearthequestionansweredinthiswayAfricaisthecradleofhumankindandAfricansarepassionateandgenerous. Apparentlytherearesomemisunderstandingsbetweenus.It'struethatwithincidentsliketheEbolaoutbreakinWesternAfricaandtheemergence出现ofpiratesoffthecoastofSomaliahittingthenewsit'seasyforustokeepforgettingthatAfricahasoneoftheworld'soldestcivilizations﹣Egyptbornbytheworld'slongestrivertheNile.TheproofisintheGreatPyramidofGizaandtheGreatSphinxofGizawhicharebothpopularamongtourists.AndthetombsofancientEgypthavealsobecomeendlesssourcesfortheliteratureandfilmindustries. WhenitcomestothenaturalenvironmentofAfricaourmisunderstandingsareonlybigger.Butthetruthisthatinsteadofbeingextremelyhotallyearandcoveredbydesertthecontinenthaslargeareasofsavannas稀树草原wherelionsgiraffesandzebraslivethesnowcappedKilimanjaro﹣thehighestmountaininAfrica﹣andeventhickforestontheislandofMadagascar.Thesemisunderstandingsareoneofthereasonswhythe2018BeijingSummitoftheForumonChina﹣AfricaCooperationwasheldonSept3and4﹣tounderstandeachotherbetter. IndeedonlybyvisitingAfricaherselfdidHuangseetheconvenientlivingconditionstheamazingnaturalbeautyandthefriendlypeople.InhereyesherclassmateswereashopefulaboutthefutureoftheirowncountriesastheywereaboutAfricaasawholeandtheywerequicktodemonstrateboththeirstrongwillandactivity.AtthatmomentIknewexactlywhattheywanted﹣theywantedtheirculturetoberespected. 1Whichofthefollowingbestexplainscradleunderlinedinparagraph2? A.Asmallbedforbabies. B.Abaskettoholdsomething. C.Aplaceforpeopletorelaxthemselves. D.Aplacewheresomethingimportantbegan. 2WhatcanweinferaboutAfricaaccordingtothepassage? A.Itisveryhotalltheyearround. B.It'snotasafecontinenttolivein C.It'sdifferentfromwhatweimagine. D.Itisboundtohaveabrightfuture 3WhichofthefollowingwouldHuangagreewith? A.Toseeistobelieve B.Thinktwicebeforeyoudo C.Amissisasgoodasamile D.Don'tjudgeapersonbyhisappearance 4Whatcanbeasuitabletitleforthetext? A.ValuingaCulture. B.UnderstandingAfrica. C.PayingaVisittoAfrica. D.DiscoveringaContinent.
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关于函数fx=|x﹣1|﹣1的下列结论错误的是
直线2x+y﹣3=0与圆x2+y2﹣2x﹣2y=0相交于AB两点O为坐标原点则.
在平面直角坐标系中记曲线C为点P2cosθ﹣12sinθ+1的轨迹直线x﹣ty+2=0与曲线C交于AB两点则|AB|的最小值为
已知i是虚数单位复数=
已知函数y=sinωxω>0在0上有最大值没有最小值则ω的取值范围为.
已知集合P={012}Q={x|x<2}则P∩Q=
若不等式组可表示为由直线围成的三角形区域包括边界则实数a的范围是
已知关于x的方程其中都是非零向量且不共线则该方程的解的情况是
过椭圆C+=1a>b>0的左焦点F的直线过C的上端点B且与椭圆相交于另一个点A若|BF|=3|AF|则C的离心率为.
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