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若集合A={y|y=2x,x∈R},B={y|y=x2,x∈R},则( )
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高一上学期数学《》真题及答案
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设集合M.={x|x2+2x=0x∈R.}N.={x|x2-2x=0x∈R.}则M.∪N.=
{0}
{0,2}
{-2,0}
{-2,0,2}
有如下两个类定义 classXX{ private: doublex1; protected: d
1
2
3
4
已知全集U=R集合
={x | x2 -x-6≤0},
={x|
>0},那么集合A
(CUB.)= A.{x|-2≤x<4}B.{x|x≤3或x≥4}
{x|-2≤x≤0}
{x|0≤x≤3}
集合
={x|x
2
+2x>0},
={x|x
2
+2x﹣3<0},则A.∩B.=( ) A.(﹣3,1)B.(﹣3,﹣2)
R
(﹣3,﹣2)∪(0,1)
设集合A.={x│x2-2x≤0x∈R.}则集合A.∩Z.中有_____________个元素.
设全集为实数集R.函数fx=lg2x﹣1的定义域为A.集合B.={x||x|﹣a≤0}a∈R.Ⅰ若a
若集合
={x|0<x<1},
={x|x
2
﹣2x<0},则下列结论中正确的是( ) A.A.∩B.=∅B.A.∪B.=R
A.⊆B
B.⊆A.
已知函数fx的定义域为R且对任意的实数x导函数f′x满足01若对任意的闭区间[ab]R总存在x0∈
有如下两个类定义 classXX private doubleX1 protected doubl
1
2
3
4
若集合
={(x,y)|y=2x
2
,x∈R},集合
={(x,y)|y=2
x
,x∈R},则集合A.∩B的真子集的个数是( ) A.4B.5
6
7
设x∈Z集合A是奇数集集合B是偶数集.若命题p∀x∈A2x∈B则
¬p:∃x∈A,2x∈B
¬p:∃x∉A,2x∈B
¬p:∃x∈A,2x∉B
¬p:∀x∉A,2x∉B
已知全集U=R集合
={x|x2>4},
={x|
≤0},则(∁UA)∩B.等于( )
A.{x|-2≤x<1} B.{x|-3≤x<2}
{x|-2≤x<2}
{x|-3≤x≤2}
设x∈Z集合
是奇数集,集合
是偶数集.若命题p:∀x∈A.,2x∈B.,则( ) A. ﹁p:∀x∈A.,2x∉BB. ﹁p:∀x∉A.,2x∉B
﹁p:∃x∉A.,2x∈B
﹁p:∃x∈A.,2x∉B.
下列命题中为真命题的是
若x≠0,则x+
≥2
命题:若x2=1,则x=1或x=﹣1的逆否命题为:若x≠1且x≠﹣1,则x2≠1
“a=1”是“直线x﹣ay=0与直线x+ay=0互相垂直”的充要条件
若命题
:∃x∈R.,x2﹣x+1<0,则¬
:∀x∈R.,x2﹣x+1>0
有如下两个类定义classXXprivate:doublex1;protected:doublex2
1
2
3
4
设二元函数y=fxy满足fx1=0f’yx0=sinxfyyxy=2x则fxy=______.
设x∈Z.集合
是奇数集,集合
是偶数集.若命题p:∀x∈A.,2x∈B.,则( ) A.非p:∀x∈A.,2x∉BB.非p:∀x∉A.,2x∉B.
非p:∃x∉A.,2x∈B
非p:∃x∈A.,2x∉B.
已知集合A.={x|x2﹣2x﹣3≤0}B.={x|x2﹣2mx+m2﹣9≤0}m∈R.1若m=3求
有如下两个类定义classXXprivatedoublex1protecteddoublex2pub
1
2
3
4
设fxy满足fx1=0f’zx0=sinxfyyxy=2x则fxy=______.
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Asimplelifemeansgettingridofmanyofthethingsyoudosothatyoucanspendmoretimewithpeopleyouloveanddothethingsyoulove.1It'softenajourneyoftwostepsforwardandonebackward. Evaluateyourtime.2Whatthingsdoyoudofromthetimeyouwakeuptothetimeyougotosleep?Makealistandevaluatewhetherthey'reinlinewithyourpriorities.Ifnotremovethemandfocusonwhat'simportant.Redesignyourday. Limityourcommunications.OurlivesthesedaysarefilledwithavastflowofcommunicationsemailcellphonespapermailTwitterforumsandmore.3Insteadsetalimitonyourcommunicationsonlydealwithemailsatcertaintimesoftheday.Limitphonecallstocertaintimestoo.Itisthesamewithothercommunications.Setascheduleandsticktoit. Trylivingwithoutacar.OKthisisn'tsomethingI'vedonebutmanyothershave.4Walkbikeortakepublictransportation.Itreducesexpensesandgivesyoutimetothink.Acarisalsoverycomplicatedneedingnotonlycarpaymentsbutinsurancemaintenancerepairsgasandmore. 5Ifyouridyourhomeofstuffyoumightfindyoudon'tneedsomuchspace.I'mnotsayingyoushouldliveonaboatalthoughIknowsomepeoplewhohappilydosobutifyoucanbecomfortableinasmallerhomeitwillnotonlybelessexpensivebuteasiertomaintainandgreatlysimplifyyourlife. A.Considerasmallerhome. B.Haveaplaceforeverything. C.Howdoyouspendyourday? D.It'ssomethingIwoulddoifIdidn'thavekids. E.Theycantakeupyourwholedayifyouletthembe. F.Howevergettingtosimplicityisn'talwaysasimpleprocess. G.Mostpeopledon'tknowwhatenoughisandthustheykeepbuyingmore.
某日ABC三个城市18个销售点的小麦价格如表 Ⅰ甲以B市5个销售点小麦价格的中位数作为购买价格乙从C市4个销售点中随机挑选2个了解小麦价格.记乙挑选的2个销售点中小麦价格比甲的购买价格高的个数为X求X的分布列及数学期望 Ⅱ如果一个城市的销售点小麦价格方差越大则称其价格差异性越大.请你对ABC三个城市按照小麦价格差异性从大到小进行排序只写出结果.
在平面直角坐标系xOy中以原点O为极点x轴的正半轴为极轴建立极坐标系曲线C1的参数方程为θ为参数曲线C2的极坐标方程为ρcosθ﹣ρsinθ﹣4=0. 1求曲线C1的普通方程和曲线C2的直角坐标方程 2设P为曲线C1上一点Q为曲线C2上一点求|PQ|的最小值.
如图在四棱锥P﹣ABCD中AC⊥BDAC∩BD=OPO⊥AB△POD是以PD为斜边的等腰直角三角形且OB=OC=OD=OA=1 1证明平面PAC⊥平面PBD. 2求二面角A﹣PD﹣B的余弦值.
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以棱长为1的正方体各面的中心为顶点构成一个正八面体再以这个正八面体各面的中心为顶点构成一个小正方体那么该小正方体的棱长为
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函数fx=2cosxx∈[﹣ππ]的图象大致为
过抛物线y2=4x焦点F的直线交抛物线于AB两点分别过AB作准线l的垂线垂足分别为CD.若|AF|=4|BF|则|CD|=.
已知函数fx=若ff0=3a则实数a等于
函数fx=Asinωx+φA>0ω>0﹣π<φ<0x∈R的部分图象如图所示. I求函数y=fx的解析式 II当x∈[﹣2π0]时求fx的最大值最小值及取得最大值最小值时相应x的值.
Haveyoucomplained1yourfamilyyourbossorevenyourlife?Maybeeveryonehasbutafterreadingthisstoryyoumaychangeyourviewandtreattheworldwithanotherattitude. Anass驴2belongtoanherb﹣sellerwhogavehimtoolittlefoodandtoomuchworkcouldnotbearthelifeanylonger.SohemadearequesttoGodtobereleasedfromhispresentserviceandprovidedwith3master.Afterwarninghim4hewouldregretdoingitGodmadehimtobesoldtoatile﹣maker.Shortlyafterwardstheassfoundthathehad5heavyloadstocarryandharderworkinthebrick﹣fieldandaskedforanotherchangeagain.Godtellinghimthatitwouldbe6lasttimethathecouldsatisfyhisrequestmadehimsoldtoatanner皮革工.Theassfoundthathe7fallintoworsehands.Knowinghisnewmaster'soccupationhesaidItwouldhavebeenbetterformeeithertohavebeenstarvedbythefirstowner8tohavebeenoverworkedbythesecond.ButnowIhavealreadybeenboughtbymypresentowner9willpeeloffmyskinevenafterIamdeadandmakemeuseful. Wecanseethatpeoplewithdissatisfactioninaplacearenot10liketofindhappinessinanother.
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已知四边形的顶点ABCD在边长为1的正方形网格中的位置如图所示则=.
目前你校有许多学生因为各种原因很少参加体育锻炼假定你是张华请你就此事向你校英语报写一封信倡导同学们积极参与体育锻炼. 内容包括 1.学生们不参加体育活动的原因 2.进行体育活动的好处. 注意 1.词数100左右 2.可以适当增加细节以使行文连贯 3.文章开头和结尾语已给出不计入总词数. Dearschoolmates Nowadaysmoststudentsdon'tdosportsforkindsofreasons.
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TimeTravel Ifyoucouldtravelintimewherewouldyougo?PerhapsyouwouldwatchanoriginalperformanceofaShakespeare'splayinElizabethanEngland?WhatabouthangingoutwithLaoziintheSpringandAutumnPeriod?Ormaybeyou'dvoyagefaraheadofthepresentdaytoseewhatthefutureholds. Thepossibilityoftimetravelisindeedappealing.Storiesexploringthesubjecthavebeenaroundforhundredsofyears.Perhapsthebestknownexampleissciencefictionnovel.TheTimeMachinewhichwaswrittenbyH.G.Wellsandpublishedin1895forthefirsttime.Itwasadaptedintoatleasttwofeaturefilmsofthesamenameaswellastwotelevisionversionsandalargenumberofcomicbookadaptations.Itisgenerallycreditedwiththepopularizationoftheconceptoftimetravelusingavehiclethatallowsanoperatortotravelpurposefullyandselectively.ThetermtimemachinecoinedbyWellsisnowuniversallyusedtorefertoavehicletransportingpeopleintothefarfuture. Butcouldtimetravelactuallybepossible?Somescientistssayyesintheory.Theyproposeusingcracksintimeandspacecalledwormholeswhichcouldbeusedasshortcutstootherperiods.Einstein'stheoryofrelativityallowstimetravelinextremecircumstances.AndBritishphysicistStephenHawkingsaysyoucouldtravelintothefuturewithareallyfastspaceshipgoingatnearlythespeedoflight.Thoughbuildingsuchaspaceshipwouldofcoursebenosimpletask. Evenifyoucouldtravelintothepastthereissomethingcalledthegrandfatherparadox.Itaskswhatwouldhappenifatimetravelerweretogobackintimeandhavehisowngrandfatherkilledforsomereasonandthereforepreventhimselffrombeingborn.Ifthetimetravelerwasn'tbornhowwouldhetravelbackintime? Andwouldyoureallyliketovisitthefuture?InH.G.Wells'bookthemaincharactertravelsintodistanttimewherehearrivesatabeachandisattackedbygiantcrabs.Hethenvoyages30millionyearsintothefuturewheretheonlylivingthingisablackobjectwithtentacles触角. Ifthat'swhat'sinstoremaybewearebetterjustlivinginthepresentdayafterall. 1ThenovelTheTimeMachinementionedinParagraph2aimstoshow. A.thecontributionofH.G.Wells B.thestory'sdifferentfeatures C.thelonghistoryoftimetravel D.people'sinterestintimemachine 2Einstein'sandHawking'stheories. A.suggestthepossibilitytoinventthetimemachine B.pushtheinventionofthefirstspaceship C.haveprovedwrongbysometimetravelers D.havesimilaritiesinmanyway 3InParagraph4grandfatherparadoxprobablyreferstotheideathat. A.thetravelerispreventedfrommeetinghisgrandfather B.thegrandfather'sdeathmakesthetraveler'sbirthimpossible C.thetravelergoesbackintimetoseekforhisgrandfather D.thereunionofthetravelerandhisgrandfatherbringshappiness 4Accordingtothepassagewhatisprobablytheauthor'sattitudetowardstimetravel? A.Skeptical. B.Unclear. C.Supportive. D.Unconcerned.
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