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函数y=xlnx的最小值为( )
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高三上学期数学《》真题及答案
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函数y=xlnx在0+∞上的最小值为.
若函数y=ax+1在[12]上的最大值与最小值的差为2则实数a的值是________.
若函数y=fx是奇函数且函数Fx=afx+bx+2在0+∞上有最大值8则函数y=Fx在﹣∞0上有
最小值﹣8
最大值﹣8
最小值﹣4
最小值﹣6
已知函数fx=xlnx.1求fx的最小值2讨论关于x的方程fx-m=0m∈R的解的个数.
函数y=ax在[01]上的最大值与最小值之和为3则a=________.
若奇函数fx在[37]上是增函数且最小值为5则fx在[-7-3]上是
增函数且最小值为-5
增函数且最大值为-5
减函数且最小值为-5
减函数且最大值为-5
如果奇函数y=fx在区间[37]上是增函数且最小值为5则在区间[-7-3]上
增函数且有最小值-5
增函数且有最大值-5
减函数且有最小值-5
减函数且有最大值-5
函数y=x2﹣2x的最小值为__________.
设函数y=x2-2xx∈[-2a]若函数的最小值为ga则ga=.
函数y=|x-3|-|x+1|的
最小值是0,最大值是4
最小值是-4,最大值是0
最小值是-4,最大值是4
没有最大值也没有最小值
.函数y=0<x<π的最小值为________.
函数y=x2x在区间01]上的最小值为
定义函数y=且函数在区间[37]上是增函数最小值为5那么函数y在[﹣7﹣3]上
为增函数,且最小值为﹣5
为增函数,且最大值为﹣5
为减函数,且最小值为﹣5
为减函数,且最大值为﹣5
设函数y=x2-2xx∈[-2a]若函数的最小值为ga则ga=________.
函数y=sinx+1的最大值是__________最小值是_____________
定义[x]表示不超过x的最大整数例如:[1.5]=1[-1.5]=-2若fx=sinx-[x]则下列
函数y=x﹣12+3的最小值为
函数y=2x2-1x∈N.*的最值情况是
无最大值,最小值是1
无最大值,最小值是-1
无最大值,也无最小值
不能确定最大、最小值
实数xy满足如果目标函数z=x—y的最小值为-2则实数m的值为______.
已知二次函数y=-x2-2x.关于该函数在-3≤x≤0范围内下列说法正确的是
有最大值1,无最小值
有最大值1,有最小值0
有最大值1,有最小值-3
有最大值0,有最小值-3
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You'vegotyourfancynewsuitcaseandyou'rereadytotakeitwithyouonyourtravelsacrosstheglobe. Yougettotheairportquicklymovingthroughthecrowdsontheunevenpavementrushingtocheckin.Thenyourheartsinkswhenyourealizeyournewsuitcasehasgotaseriouscaseofthewobbles摇晃. Whydoesthishappen? ScientistsfromtheUniversiteParis﹣DiderotinFranceinvestigatedthismatterandpublishedtheirfindingsinthesciencejournalProceedingsoftheRoyalSocietyA.Theyalsosuggestedsomesolutionstoovercomethismodern﹣dayproblem. Tolearnmoreabouttheissuetheyputasuitcaseonatreadmill跑步机andobservedwhathappened. Itwassoonnotedthatthewobblewasactuallyaresultofrepeatedactionsthatcausedthesuitcasetoswayfromsidetoside.Theydiscoveredthatifoneofthewheelsencounteredanobstaclesuchasasmallbumpitjumpedintotheairforjustamomentandthenbangedbackdowntotheground.Thatsecondactioncausedtheoppositewheeltoliftoffthegroundandthentobangbackdowncausingthefirsttoliftagainandsoon.Thisswayingincreasedastheluggagewaspulledalong. Thesuitcaseisafunwaytotackletheproblembutthestudywouldbethesameforanytrolleywithtwowheelsorblades桨叶SylvainCourrechduPontleadauthorofthestudytoldBBCNews.Soitwillbethesameforacaravan大篷车ormaybealsoforairplanes. Insteadofslowingdownwhenweseearockypartofthepaththescientistsrecommendeddoingtheexactoppositeandspeedingup.Thisisbecausegoingfastergivesthewheelslesstimetoriseandfallpreventingthecasefromswaying.Theyalsosaidthatreducingtheangleofthesuitcasebyloweringitshandletothegroundwouldhelpkeepitsteady. ThesefindingscouldhelpresearcherssimulateanddesignbetterrollingsuitcasesandotherpulledtrolleyssuchastowedtrailersCourrechduPontadded. Withthesemasterminds智者workingonperfectingoursuitcaseproblemswobblyluggagemaysoonbeathingofhistoryleavingustoenjoyourtravels. 1Themainpurposeofthefirsttwoparagraphsisto. A.showtheimportanceofagoodwheeledsuitcasefortravel B.leaduptothewobblingproblemofwheeledsuitcases C.describehowunstablewheeledsuitcasescanbe D.showthatwobblingcancausewheeledsuitcasestostopworking 2Accordingtothescientistswhenasuitcasemeetswithanobstacle. A.theswayingwillstopforamoment B.itstwowheelswilljumpintotheairatthesametime C.evenasmallobstaclecanleadtoaseriousdamage D.thereisaseriesofrepeatedactionsleadingtotheswaying 3Whatcanbedonetokeepasuitcasesteadyonanunevenpathaccordingtothetext? A.Slowdown. B.Pullthesuitcaseatafasterspeed. C.Raisethehandleofthesuitcase. D.Increasetheangleofthesuitcase. 4Accordingtothearticlethefindingscould. A.helpimprovethedesignofsuitcases B.solvethewobbleofsuitcasescompletely C.behelpfulintheadvancementoftreadmills D.beusedtodevelopbladesforboats
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
WilliamButlerYeatsamostfamousIrishwriterwasborninDublinonJune131865.Hischildhood1theharmonythatwas2ofahappyfamily.LaterYeatsshockedhisfamilybysayingthatherememberedlittleofchildhoodbutitspain.Infacthe3excellenttasteinartfromhisfamily﹣bothhisfatherandhisbrotherwerepainters.Buthefinally4literature5dramaandpoetry. Yeatshadstrong6inthecomingofnewartisticmovements.Hesethimselfthe7taskinfoundinganIrishnationaltheatreinthelate1890s.Hisearlytheatricalexperiments8werenotreceived9atthebeginning.Hedidn'tloseheartandfinallyenjoyed10inhispoeticaldrama. 11withhisdramaticworksYeats'spoemsattractmuch12notice.Thesubjectmatterincludeslovenaturehistorytimeandaging.ThoughYeatsgenerallyreliedonverytraditionalformshebroughtmodern13tothem.Ashisliterarylife14hispoetrygrewfinerandricherwhichledhimtoworldwide15. Hehadnot16amajorpubliclife17winningtheNobelPrizein1923.Yethecontinuedwritingalmosttotheendofhislife.HadYeatsstoppedwritingatage40hewouldprobablynowbe18asaminorpoetforthereisnootherexampleinliteraryhistoryofapoetwho19hisgreatestworksbetweentheagesof50and75.AfterYeats'sdeathin1939W.H.Audenwroteamongothersthefollowinglines Earthreceivean20guest WilliamYeatsislaidtorest. LettheIrishvessel船lie. Emptiedofitspoetry. 1A.held B.lacked C.expected D.desired 2A.typical B.special C.awkward D.capable 3A.inherited B.developed C.abandoned D.formed 4A.carriedon B.decidedon C.puton D.basedon 5A.regularly B.instantly C.particularly D.finally 6A.desire B.energy C.access D.faith 7A.fresh B.stupid C.small D.difficult 8A.therefore B.however C.besides D.furthermore 9A.possibly B.honorably C.favorably D.doubtfully 10A.failure B.fame C.pleasure D.success 11A.Connected B.Occupied C.Compared D.Tired 12A.admiring B.amusing C.amazing D.envying 13A.potential B.sensibility C.possibility D.benefit 14A.finished B.produced C.created D.progressed 15A.praise B.spread C.recognition D.assessment 16A.enjoyed B.accepted C.purchased D.taken 17A.before B.since C.until D.after 18A.respected B.admired C.valued D.favored 19A.prohibits B.attempts C.recommends D.produces 20A.appealed B.advocated C.advanced D.honored
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函数y=3sinx+4cosxx∈R的值域是
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不等式kx≥x>0恒成立则k的最小值为
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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=
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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
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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