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设(1+x2)(2﹣x)4=a0+a1(x﹣1)+a2(x﹣1)2+a1(x﹣1)3+a4(x﹣1)4+a5(x﹣1)5+a6(x﹣1)6,则a0+a2+a4+a6= .
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高三下学期数学《》真题及答案
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设函数fx=x2+2a-1x+4若x1fx2则实数a的取值范围是________.
设fx在0+∞有定义在x=1处可导且f’1=4若对任意x1>0x2>0有fx1x2=x1fx2+x2
使用VC6打开考生文件夹下的工程RevProj10此工程包含一个源程序文件RevMain10.cpp
若将函数fx=x5表示为fx=a0+a11+x+a21+x2++a51+x5其中a0a1a2a5为实
设U.=R.A.={x|x2-3x-4>0}B.={x|x2-4<0则A.{x|x≤-1或x≥2}B
设集合
={x|﹣1≤x≤2},
={x|x
2
﹣4x>0,x∈R},则A.∩(∁
R.
B.)=( ) A.[1,2]B.[0,2]
[1,4]
[0,4]
设方程x2-4x-1=0的两个根为x1与x2则x1x2的值是
-4
-1
1
0
设集合
={x|x
2
-2x-3<0},
={x|1≤x≤4},则A.∩B.= ( ) A.{x|1≤x<3} B.{x|1≤x≤3}
{x|3
{x|3≤x≤4}
设方程x2-4x-1=0的两个根为x1与x2则x1·x2的值是
-4
-1
1
0
阅读题例解答下题例解方程x2-|x-1|-1=0.解1当x-1≥0即x≥1时x2-x-1-1=x2-
阅读题例解答下题例解方程x2﹣|x﹣1|﹣1=0解1当x﹣1≥0即x≥1时x2﹣x﹣1﹣1=0x2﹣
设完成一定运量所消耗的运营指标数为X1X2X3Xn各项 指标相应的支出率为A1A2A3An无关支出为
A1X1+A2X2+…+AnXn
X1+X2+…+Xn+B
A1X1+A2X2+…+AnXn+B
A1+A2+…+An+B
设fx在0+∞有定义在x=1处可导且f’1=4若对任意x1>0x2>0有fx1x2=x1fx2+x2
使用VC6打开考生文件夹下的工程RevProj10此工程包含一个源程序文件RevMain10.cpp
2x-16=a6x6+a5x5+a4x4+a3x3+a2x2+a1x+a0则a2=
60
-60
160
15
设X~N14则下面表述正确的是
P(X<2)=P(X>-2)
P(X<2)=1-P(X>0)
P(X<2)=P(X>0)
P(X<2)=1-P(X>-2)
二次函数fx=ax2+bx+1a>0设fx=x的两个实根为x1x21如果b=2且|x2-x1|=2求
二次函数fx=ax2+bx+1a>0设fx=x的两个实根为x1x2.1如果b=2且|x2-x1|=2
设集合
={x|x2-2x-3<0},
={y|y=2x,x∈[0,2]},则A.∩B=( ) A.[0,2]B.(1,3)
[1,3)
(1,4)
若x+1+x+12++x+1n=a0+a1x-1+a2x-12++anx-1n求a0+a1++an.
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图中能正确表示基因分离定律实质的是
Althoughtheideaofzeroemissionnetcarbon﹣positivesustainable可持续developmentwaspromotedworldwidemostcitiesareatalosswhattodoorevensomehaveobjectedtoit.ButinLiuzhouacityinsouthernChinaattitudescouldnotbemoredifferent. TheLiuzhouMunicipalityUrbanPlanningBureauhassignedupItalianarchitectStefanoBoerithefatheroftheforestcitymovementtobuildaself﹣containedcommunityforupto30000people.Heisthego﹣tomanforsuchprojectsthankstothesuccessofhisverticalforeststworesidential住宅的towers.Completedin2014theyremoveupto17.5tonsofsoot煤烟fromtheaireachyearandayearlateroneofthemwasnamedBestTallBuildingWorldwide. TheLiuzhouprojectisamuchmoreambitiousundertakinghowever.Itshomeshospitalshotelsschoolsandofficeswillbebuiltona340﹣acresiteinwhatBoericallsthefirstattempttocreateanurbanenvironmentthatisreallytryingtofindabalancewithnature.Its100speciesofplantlifeareexpectedtoabsorbalmost10000tonsofcarbondioxideand57tonsofpollutantsperyearwhileatthesametimeproducing900tonsoflife﹣givingoxygen. Althoughthearchitectshaven'tpublishedthecostoftheforestcitytheMilantowerscostonlyfivepercentmorethantraditionalskyscrapers. TheconstructionofhisforestcityatLiuzhouissettobeginin2020andthereisstillagreatdealofplanningandresearchrequiredbeforeaprojectedcompletiondatecanbeset.HoweverBoeriremainsoptimisticabouttheprojectandhasconfidenceinthesoundnessofhisvisionIreallythinkthatbringingforestsintothecityisawaytodealwithglobalwarming. 1What'sLiuzhou'sattitudetowardsthesustainabledevelopment? A.Approving. B.Cautious. C.Unfavorable. D.Doubtful. 2WhyisStefanoemployedfortheLiuZhouproject? A.Hevolunteeredtodotheproject. B.Heisafamousarchitectintheworld. C.Heisthefatheroftheforestrecovery. D.Hehasgainedexperienceinsimilarprojects. 3Whatdoestheunderlinedwordtheyreferto? A.Thearchitects. B.Thetwotowers. C.Forestsinthecity. D.Theresidentsofthecity. 4What'sthepurposeofLiuZhouproject? A.Toprovidemorejobs. B.Tobringforestintocity. C.Tosolvehouseshortage. D.Toimprovetheenvironment.
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Asafirstresponderyouneverknowwhattypeofsituationyoumightwalkintoorwhoyou'llmeetalongtheway.That'sdefinitelybeenthecaseforJeffreyLanenberga51﹣year﹣oldparamedic急救医务人员since1984. TenyearsintothejobLanenbergreceivedacallthatreportedthatamaninhisearly30shadfallendownintheMallofAmerica.WhenLanenbergandhispartnerarrivedatthescenetheyfoundtheyoungmalefacedownontheground.Hehadgoneunconsciousmakingweakattemptstobreathe.Hiswifestoodbesidehimholdingtheirsmallsoninhorror.Theyquicklyrushedtodefibrillate除颤andcalmthemantokeephimundercontrol.AfterLanenbergdroppedthepatientoffattheneighboringhospitalhethoughtaboutthemanandhisfamilyforalongtime. LanenbergthoughthehadexperiencedeverythingunderthesununtilonerandomvisittoOfficeMaxthreeyearsagowherehemetamanrepeatedlywalkbackandforthwhilestaringathim.Asitturnedoutthemanwasthepatienthehadsaved20yearsearlier. Yougaveme20yearsmorethanIeverthoughtI'dhavethemansaid.HethankedLanenbergrepeatedlyandtoldhimhehadsomeonehewantedhimtomeet.Hesteppedaroundthecornerandreappearedwitha20﹣something﹣year﹣oldman.Lanenberginstantlyknewthatitwasthesonhehadseenstandingbyhismotherallthoseyearsago. ThatdaychangedmylifeLanenbergsaid.Beforethateverythingwasaboutwork…WhenItalktomybeginner﹣trainingclassItellthemyouneverknowtheimpactyoucanhaveonsomeone'slife. 1WhatdidLanenbergdowiththeyoungman? A.Hegavethemanthefirstaid. B.Hecuredthemanatthescene. C.Heonlysentthemantohospital. D.Hetookcareoftheman'swifeandson. 2WhatdidLanenbergthinkoftheencounterwiththeman? A.Itwasunbelievable. B.Itwasacommonroutine. C.Itwasamatterofcourse. D.Itwasadangeroussituation. 3WhywasthemanthankfultoLanenberg? A.Lanenberghelpedbringuphislittleson. B.Lanenbergdonatedtosupporthisfamily. C.Lanenberggavehimthepresenthappylife. D.Lanenbergtaughthissontobeanewdoctor. 4HowdidthemeetingchangeLanenberg'slife? A.Hechangedhisattitudetohisjob. B.Hewasrewardedwithmuchmoney. C.Hegotapromotiontobeateamleader. D.Hetookupteachingworktotrainnewcomers.
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下面是光合作用过程示意图请回答问题. 1光合作用包括两个阶段其中E是在叶绿体的进行该阶段需要D阶段提供的物质是. 2叶绿体的色素分布在.图中A是. 3光合作用发生的部位是. A.叶绿素B.叶绿体C.叶绿体的基粒D.叶绿体的基质
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决定自然界中生物多样性和特异性的根本原因是生物体内
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