首页
试卷库
试题库
当前位置:
X题卡
>
所有题目
>
题目详情
若log2x+log2y=3,则2x+y的最小值是( )
查看本题答案
包含此试题的试卷
高一下学期数学《》真题及答案
点击查看
你可能感兴趣的试题
设x⊕y=2x+3yx⊙y=xy且xy均为正整数若当x⊙y=6时x⊕y取得最小值则x等于
2
6
4
3
若实数xy满足x>y>0且log2x+log2y=1则的最小值为.
若log4x+2y+log4x-2y=1则|x|-|y|的最小值是.
化简与计算1已知多项式A.=2x2﹣xyB.=x2+xy﹣623x2y﹣|2xy2﹣2xy﹣3x2y
已知正实数xy满足xy+2x+3y=42则xy+5x+4y的最小值为.
已知x+22+|y+|=0化简多项式3x2y-[x2y-22xy2-x2y-2xy2]-2xy2并求
若log4x+2y+log4x-2y=1则|x|-|y|的最小值是.
若正实数xy满足2x+y+6=xy则xy的最小值是_______.
求二元函数fxy=x3+y3-3xy在区域D=xy|0≤x≤2-1≤y≤2上的最大值与最小值
已知xy都是正实数且x+y-3xy+5=0.1求xy的最小值2求x+y的最小值.
已知正数xy满足x2+2xy﹣3=0则2x+y的最小值是.
若log4x+2y+log4x-2y=1则|x|-|y|的最小值是
若正数xy满足x+4y﹣xy=0则x+2y的最小值为
若正实数xy满足2x+y+6=xy则xy的最小值是________.
设x⊕y=2x+3yx⊙y=xy且xy均为正整数若当x⊙y=6时x⊕y取得最小值则x等于
2
6
4
3
若正实数xy满足10x+2y+60=xy则xy的最小值是.
若代数式xy2与﹣3xm﹣1y2n的和是﹣2xy2则2m+n的值是
3
4
5
6
热门试题
更多
一个质量为2kg的物体同时受到两个力的作用这两个力的大小分别为2N和6N当这两个力的方向发生变化时物体的加速度大小可能为
1.5分Thesituationputusataseriousd不利.
25分假定你是中学生李华在校报英语专栏看到了学校英语文化节的一则招募启事请阅读启事并根据写作要点和写作要求写一封应征邮件. 写作要点: 表达写信意图;陈述应征目的;说明应征条件性格能力等 写作要求: 邮件词数100左右:;开头和结尾部分已写好不计入总词数 DearMsChen Sincerelyyours LiHua
25分阅读下面短文根据其内容写一篇60词左右的内容概要.Oneofthetoughestthingsaboutbeingahighschoolstudentisthatyouneverseemtogetenoughsleepatnightwhichoftenleavesyounoddingoffduringclasses.Spendingeitherlessthansixormorethanninehoursinsleepingputsyourhealthatrisk.Apopularsolutiontoalackofsleepatnightistotakea'powernap小睡'duringthedaybutdoesthisworkGenerallyspeakingitcanbebeneficial.Researchshowsthatanapintheday﹣﹣﹣evenabriefoneasshortastenminutes﹣﹣﹣canclearyourmindandleaveyouwithincreasedenergyandimprovedproductivity.Herearesomethingsyouneedtoknowtonapcorrectly.Tostartwitheverytimeyoudozeoff打瞌睡duringthedaydoesnotcountasa'powernap'.Thebesttimetotakeapowernapisinthemid﹣afternoonwhenyourenergyleveltendstodecrease.Trytoavoidnapsafter4pmforsleepingtoolateinthedaycanmakeithardertofallasleepatnight.HowlongshouldapowernapbeGrabbing10﹣30minutesofrestisusuallybestforamiddle﹣of﹣the﹣daynap.Youarenotreallygettingestablishedsleepifyounodoffforonlyfiveminutes.Howevernappingmorethan40minutescanleaveyoufeelingsleepierthanwhenyoustartmeaningyou'llhavetogothroughthewholewaking﹣upprocessafteryougointothedeeperstageofsleep.Howeverasrefreshingasitmightbeifyouaregettingenoughsleepatnighttakingapowernapisn'tsuchawisechoice.Thereasonisthatsleepingduringthedaycaninterferewith妨碍yourbody'sbiorhythms生理节奏.Thebraingetsusedtogoingtobedatroughlythesametimeeachnightandgettingupatthesametimeeachdayandyoudon'twanttodisturbthisroutine.
探究“物体的加速度与力质量的关系”实验如下 1在探究物体的加速度与力的关系时应保持不变改变施加在物体上的水平拉力F测出相对应的加速度a. 2在探究物体的加速度与物体质量的关系时应保持不变改变物体的质量m测出相对应的加速度a. 3甲乙两同学用同一装置实验各自得到的a﹣F图线如图所示.说明两个同学做实验时的哪一个物理量取值不同并比较其大小.
如图所示水平桌面上叠放着AB两物体均与桌面相对静止不动则B物体受力个数为
如图所示小球沿斜面向上运动依次经过abcd后到达最高点e.已知ab=bd=6mbc=1m小球从a到c和从c到d所用的时间都是2s设小球经bc时的速度分别为vbvc则
汽车以20m/s的速度进站关闭发动机做匀减速直线运动当滑行s=100m时速度恰好减为零求 1汽车减速滑行时的加速度大小 2汽车滑行的总时间t.
对于一些实际生活中的现象某同学试图从惯性角度加以解释其中正确的是
1.5分Thereisnodifficultyintheworldthatcannotbeo克服.
蹦级是一种极限体育项目可以锻炼人的胆量和意志.运动员从高处跳下弹性绳被拉展前做自由落体运动弹性绳被拉展后在弹性绳的缓冲作用下运动员下落一定高度后速度减为零.在这下降的全过程中下列说法中正确的是
物体甲的v﹣t图象和物体乙的x﹣t图象分别如图所示则这两个物体的运动情况是
1.5分Wewanttoe装备yourchildrenwithsomespecialskills.
如图所示用橡皮筋将一小球悬挂在小车的架子上系统处于平衡状态现使小车从静止开始向左加速加速度从零开始逐渐增大到某一值然后保持此值小球稳定时细线偏离竖直方向到某一角度橡皮筋在弹性限度内.与稳定在竖直位置时相比小球的高度
质点沿x轴运动的v﹣t图象如图所示规定向右为正方向t=0时质点位于x=2m的位置则t=8s时质点位于
某物体由静止开始运动它所受到的合外力方向不变大小随时间变化的规律如图所示则在0~t0这段时间
王飞同学练习拉单杠时两臂平行握住单杠在他两臂逐渐分开的过程中手臂的拉力
1.5分Iamunconcernedwithquestionsofrzōng jiāo ormorality.
10分HowtoStudySmarterNotHarderHerearesomeofourfavoritestudytipsthatwillhelpanystudentstudysmarternotharder:Reciteasyoustudy.Reciting﹣sayingthingsoutloudshouldfirsttakeplaceasyoureadthrougheachparagraphorsection.Testyourself.Thiswillhelpyoutounderstandaswellaslearnfasterbecauseitismoreactivethanreadingorlistening.1Takefullernotes.Notesshouldbeinyourownwordsbriefandclear.2Writingnoteswillhelpyoubetterthanjustunderliningasyoureadsinceitforcesyoutorewriteideasinyourownwords.3Thebesttimetoreviewissoonafteryou'velearnedsomething.Youaremorelikelytorememberthematerialatthebeginningandtheendofthelessonsomakesureyoufocusonthemiddlewhenyoureview.Sleeponit.4It'seasiertoremembermaterialyou'vejustlearnedaftersleepingthanafteranequalperiodofdaytimeactivitybecauseyourbraincontinuestothinkevenafteryou'vefallenasleep.Combinememoryandunderstanding.Therearetwowaystoremember:bymemorizingandbyunderstanding.Multiplicationtablestelephonenumbersandmathformulasarebetterlearnedbyrote死记硬背.5Themorewaysyouhavetothinkaboutanideathemoremeaningsitwillhave;themoremeaningfulthelearningisthebetteryoucanrememberit.Payattentiontosimilaritiesinideasandconceptsandthentrytounderstandhowtheyfitinwiththingsyoualreadyknow.Neverbesatisfiedwithanythinglessthanacompletelyclearunderstandingofwhatyouarereading.Ifyouarenotabletofollowthethoughtgobacktotheplacewhereyoufirstgotconfusedandtryagain.A.Studythemiddle.B.Focusonthebeginning.C.Theyshouldbetidyandeasytoread.D.Butreadingisasimportantasreciting.E.Ideasarebestlearnedbyunderstanding.F.Studybeforegoingtobedunlessyouareverytired.G.Itwillalsohelpyoutonoticeyourmistakesandthetopicsyouhavetroubleunderstanding.
用速度传感器研究匀变速直线运动的实验中测得小车经过各时刻的瞬时速度如下 为了求出加速度最合理的方法是
15分ABiteofChinaNotripwouldbecompletewithoutexperiencingthelocalfoodculture.1actualChinahasvariouskindsofdeliciousfoodincludingawidevarietyoflocalsnacks.WithoutadoubtforthemajorityoftheforeignersIcontactedandmyself2includePekingDuckDimSumMongolianHotPotwerethefavoriteChinese3dish.Chinaisaplace4thefoodisnotonlydeliciousbutthe5cheapI'veeverfound.6mylastnightinBeijingbeforereturningtotheStatesIwenttoaPekingDuckrestaurantthathadbeensuggestformetotry.WhataBeautifulplace!Splendidwoodblockprintsonthewallsfreshflowersinthevasesonthetableattractivesilverwareandbeautifulchopsticks.Iwashanded7menuand8findmostofthepriceswereespeciallycheapforthehighqualityofthefood.Theduckcameinwholeorhalfalongwithallthelittledecorationsthatyouknowifyou'veevereatenPekingduck﹣alittletortilla玉米饼toputtheslicedduckandvegetablesinchoppedonionsauce.AnywayIendedup9orderawholeduckandthoughtI'djusttaketherestbacktomyhoteltoeatlaterifIcouldn'tfinishit.Unbelievablyintheendtherewas10ofthewholeduckleftontheplate.Ummyummy!
星系由很多绕中心座圆形轨道运行的恒星组成科学家研究星系的一个方法是测量恒星在星系中的运行速度v和离星系中心的距离r用v∝rn这样的关系来表达科学家们特别关心指数n若作用于恒星的引力主要来自星系中心的巨型黑洞则n的值为
15分Onedayawolfhadabone1stickinhisthroatunexpectedlyand2suffergreatestpain.Heran3anddownaskingeveryanimalhemettoremovethebonefromhimatthesametime4suggestarewardtothesuccessfuloperator.Acrane鹤movedby5promiseventuredherlongneckdownthewolf'sthroatanddrewoutthebone.Shethenaskedforthepromisedreward.Toherquestionthewolfshowinghisteethwith6uglysmilerepliedUngratefulcreature!Youputyourheadintoawolf'smouthandtookitoutin7safe.8dareyouaskformorerewardthanthis Those9areonlyinthehopeofareturnmustnotbesurprisedwhentheycomefacetofacewithbadmen.Whattheymeetwitharemorelaughs10thanks.
1.5分Thea气氛changedassoonasshewalkedin.
在研究下列问题中能够把研究对象看作质点的是
质量为30kg的小孩坐在10kg的雪橇上大人用与水平方向成37°斜向上的100N的拉力拉雪橇他们一起沿水平地面向前做匀速直线运动.g=10m/s2sin37°=0.6cos37°=0.8求 1雪橇对地面的压力大小 2雪橇与水平地面的动摩擦因数的大小 3地面对大人的摩擦力大小和方向.
在“研究匀变速直线运动的规律”的实验中某同学获得的一条纸带如图所示. 1已知打点计时器电源频率为50Hz则纸带上打相邻两点的时间间隔为. 2ABCDEFG是纸带上7个计数点每两个相邻计数点间有四个点没有画出从图中读出AB两点间距x=m 3C点对应的速度是m/s小车运动的加速度为m/s2.计算结果保留二位有效数字. 4若实验后发现实际所用交流电的频率高于50hz则上述计算结果与实际值相比是.填“偏大”“偏小”还是“不变”
如图所示倾角为θ=37°足够长的斜面体固定在水平地面上小木块在沿斜面向上的恒定外力F作用下从斜面上的A点由静止开始向上作匀加速运动前进了4.0m抵达B点时速度为8m/s.已知木块与斜面间的动摩擦因数μ=0.5木块质量m=1kg.g=10m/s2取sin37°=0.6cos37°=0.8. 1木块所受的加速度多大 2木块到外力F多大
7.5分Theanswertoprotectingandsavingmarine海洋wildlifecanstartwithcuttingbackonsomethingAmericansuseeveryday﹣plasticdrinkingstraws.ActorAdrienGrenierbestknownforplayingVincentChaseinthe2015movieEntouragelaunchedacampaigntoreducetheamountofsingle﹣useplasticusageinthiscountryinordertoprotectandsavemarinewildlifeandtheenvironment.Plasticdrinkingstrawsareamongmanymanysingle﹣useplasticproductscontributingtotheshockinglossofmarinelifebutthey'reagreatplacetostartbecausethey'resomethingAmericansareusingbythehundredsofmillionswithoutanyawarenessthatthey'resodamaging. AccordingtoEcocycleaninternationalenvironmentalorganizationAmericansusemorethan500millionstrawsdailywhichareenoughtofill127schoolbuseseachdayandtheycan'tberecycled.That meansplasticstrawsendupinlandfillsoroceanswherefishandothermarinewildlifemistakethesmallbitsforfoodandswallowthem.AfterseeingaphotoofawhalebeachedontheshorewithabellyfullofplasticGrenierfelttheinspirationtolaunchtheLonelyWhaleFoundationhopingtoinspireandeducateothersonthechallengesfacingmarinelife. AlongwithstoppingtheuseofstrawsGrenierhopestoeducateconsumersonthedangersofothersingle﹣useplasticitemssuchasgrocerybagsandwaterbottles.WhilemanyAmericansusetheseplasticproductsintheirdailylifetherearemoresustainablealternativesthatcanhelpprotecttheenvironmentEcocyclerecommendstheuseofstrawsmadefromstainlesssteelglassandevenbambooinsteadofplastic.Youcanbuyanumberoftheseenvironmentallyfriendlystrawsonlineandinstores. 1WhatistheprimarypurposeoftheLonelyWhaleFoundation A.Toadvocateagreenlifestyle. B.TopromoteGrenierslatestmovie. C.Toencouragepeopletoprotectoceanlife. D.Tosavepreciousnaturalresources. 2WhatcausedGreniertostarttheLonelyWhaleFoundation A.Apictureofadeadwhale. B.Plasticstrawsinlandfills. C.Theseveredamagedonetothesea. D.Thedisappearanceofsomespeciesunderthesea. 3Ecocycleadvisespeopletousestrawsthatare. A.easytorecycle B.harmlesstotheenvironment C.specialtomarinelife D.convenienttouse
如图所示一个人用与水平方向成θ=30°角的斜向下的推力F推一个重G=200N的箱子匀速前进箱子与地面间的动摩擦因数为μ=0.4g=10m/s2. 求①推力F的大小 ②若人不改变推力F的大小只把力的方向变为水平去推这个静止的箱子推力作用时间t=3.0s后撤去箱子最远运动多长距离.
热门题库
更多
高一下学期数学
教案备课库
高一上学期数学
高一上学期化学
教案备课库
教案备课库
教案备课库
高一上学期物理
教案备课库
教案备课库
教案备课库
教案备课库
教案备课库
教案备课库
教案备课库
教案备课库