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已知向量=(﹣2,1),=(1,x),⊥,则x=( )
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高一下学期数学《》真题及答案
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若平面向量1x和=-21互相平行其中x∈R.则x=
已知向量a=21b=xy.1若x∈{-1012}y∈{-101}求向量a∥b的概率.2若x∈[-12
已知向量a=21b=x-2若a∥b则a+b等于
(-2,-1)
(2,1)
(3,-1)
(-3,1)
已知全集R.集合M={x|x>1}N={x||x|≤2}则∁R.M.∩N.等于
(﹣2,1]
[﹣2,1)
[﹣2,1]
[1,2]
已知向量a=21b=xy.1若x∈{-1012}y∈{-101}求向量a∥b的概率2若x∈[-12]
已知向量a=x-12b=21则a⊥b的充要条件是
x=-
x=-1
x=5
x=0
已知集合A={x∈R||x|≤2}B={x∈R|x≤1}则A∩B=
(-∞,2]
[1,2]
[-2,2]
[-2,1]
已知二次函数y=x2-4x+5的顶点坐标为
(-2,-1)
(2,1)
(2,-1)
(-2,1)
x=是向量a=x+21与向量b=22-x共线的________条件.
已知向量=1x-2=21x且⊥则x的值为____
-1
0
1
2
已知向量a=21b=x-2若a∥b则a+b等于
(-2,-1)
(2,1)
(3,-1)
(-3,1)
已知二次函数y=x2-4x+5的顶点坐标为
(-2,-1)
(2,1)
(2,-1)
(-2,1)
已知函数y=fx定义在[-21]上且有f-1>f0则下列判断正确的是
y=f(x)必为[-2,1]上的增函数
y=f(x)不是[-2,1]上的增函数
y=f(x)必为[-2,1]上的减函数
y=f(x)不是[-2,1]上的减函数
已知向量m=11与向量n=x2-2x垂直则x=________.
已知向量a=x-12b=21则a⊥b的充要条件是
x=-
x=-1
x=5
x=0
设向量a=x3b=21若对任意的正数mn向量ma+nb始终具有固定的方向则x=________.
已知向量=-21与=x2互相垂直则x=.
若αβ是一组基底向量γ=xα+yβxy∈R.则称xy为向量γ在基底αβ下的坐标现已知向量a在基底p=
(2,0)
(0,-2)
(-2,0)
(0,2)
若平面向量1x和=-21互相平行其中x∈R.则x=
本小题满分12分已知向量a=21b=xy.1若x∈{-1012}y∈{-101}求向量a∥b的概率2
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修建隧道可以方便出行.如图AB两地被大山阻隔由A地到B地需要爬坡到山顶C地再下坡到B地.若打通穿山隧道建成直达AB两地的公路可以缩短从A地到B地的路程.已知从A到C坡面的坡度i=1从B到C坡面的坡角∠CBA=45°BC=4公里.1求隧道打通后从A到B的总路程是多少公里结果保留根号2求隧道打通后与打通前相比从A地到B地的路程约缩短多少公里结果精确到0.01≈1.414≈1.732
某校高一年级今年计划招四个班的新生并采取随机摇号的方法分班小明和小红既是该校的高一新生又是好朋友那么小明和小红分在同一个班的机会是
TheInternationalVoluntaryServicerunsnumberofYouthExchangesthroughouttheyear.YouthExchangesgivesmallgroupsof4﹣5youngpeopletheopportunitytotakepartinvolunteeringtripsabroadforanaverageoftwoweeks.Theseyoungpeopletheopportunitytotakepartinvolunteeringtripsabroadforanaverageoftwoweeks.Theseyoungpeoplearejoinedby4﹣5youngpeoplefrom3﹣4othernationalitiesandareawonderfulinterculturalexperienceinasafeenvironment. ExampleYouthExchanges YouthExchange1 LocationIreland OthernationalitiesIrelandSpainItalyHungary ThemeFocusesonthetopicofcommunityreconstructionandcommunityactivities﹣﹣﹣exploringhowlocalissuesfacingoutcommunitiesareconnectedtoglobalissues.Thegroupwillalsolearnabouttheeco﹣villageasanexampleofacommunityandtakepartinteam﹣buildingactivities. YouthExchange2 LocationFrance OthernationalitiesBulgariaItalyFrance ThemeOrganicgardening&continualliving.ThisprojectwilltakeplaceinanaturalparkWherethegroupwilltakepartingardeningactivitiesandgames/workshopsaboutcontinuousdevelopment. YouthExchanges3 LocationMacedonia OthernationalitiesSerbiaTurkeyIreland ThemeFoster培育socialinclusionandmotivatepersonaldevelopmentofyoungpeoplethroughsportandoutdooractivities.Promoteoutdooractivitiesasatooltohelpinclusionofyoungpeoplewithfeweropportunities. YouthExchange4 LocationItaly OthernationalitiesItalyBulgariaGreece ThemeAsocial﹣environmentalprojectthatintendstopromotesocialinclusionandcontinuousdevelopmentregardedasaprocessofcivilrightsandactivecitizenship.Over10daysthegroupwillparticipateinactivitiestoraiseawarenessabouttheeffectofourbehaviorontheenvironment. 1WhatdoyoufocusonwhentravellinginFrance? A.Gardeningwork B.Civilrights. C.Developingsocialinclusion. D.Rebuildingcommunities. 2Ifyouareinterestedinprotectingtheenvironmentyoucantakepartin. A.YouthExchange1 B.YouthExchange2 C.YouthExchange3 D.YouthExchange4 3WhichnationalityareYouthExchangesmostpopularwith? A.Spain. B.Italy. C.Ireland. D.France.
在环保督察中为落实“垃圾分类”环卫部门要求垃圾要按红黄绿三类分别装袋红类指废电池过期药品等有毒垃圾黄类指剩余食品的厨余垃圾绿类指塑料废纸等可回收垃圾小丽投放了一袋垃圾小芳投放了两袋垃圾这两袋垃圾不同类 1小丽投放的一袋垃圾恰好是红类的概率是 2求小芳投放的垃圾恰好有一袋与小丽投放的垃圾是同类的概率.
下列赋予4m实际意义的叙述中不正确的是
比1小3的数是
InChinathehistoryofpeopleplantingandusingbamboocandatebacktoasfaras7000years.AsearlyastheShangDynastybamboowasbeingusedinancientpeople'sdailylives.Itwasusedforfoodclothinghousingtransportation1musicinstrumentsandevenweapons. The2applyofbambooinscienceandtechnologyisthrilling.In251BCLiBinginSichuan3leadthelocalpeopleinbuildingtheDujiangWeirs都江堰thefirstirrigationnetworkintheworldinwhichbambooplayed4importantrole.Theworld'soldestwaterpipewasalso5makeofbamboo.DuringtheHanDynastythepeopleinSichuan6successsanka1600﹣metre﹣deepwellwiththickbambooropes.ThistechnologydidnotspreadtoEurope7the19thcenturyanditwasbyusingthetechnology8theAmericansdrilledthefirstoilwellinPennsylvaniain1859. InChineseculturebambooiswell﹣knownas9ofthefourgentlemeninplants.Tomanyfamousmenbambooisasymbolofgoodnessandhonesty.Itisalwayscloselyrelatedtopeopleofpositivespirits.Bambooculturecontributestoencouragingpeopletoholdonwhen10facetoughsituations.
如图所示一动点从半径为2的⊙O上的A0点出发沿着射线A0O方向运动到⊙O上的点A1处再向左沿着与射线A1O夹角为60°的方向运动到⊙O上的点A2处接着又从A2点出发沿着射线A2O方向运动到⊙O上的点A3处再向左沿着与射线A3O夹角为60°的方向运动到⊙O上的点A4处A4A0间的距离是…按此规律运动到点A2019处则点A2019与点A0间的距离是.
如图1菱形ABCD中∠ABC=120°P是对角线BD上的一点点E在AD的延长线上且PA=PEPE交CD于F连接CE. 1证明△ADP≌△CDP 2判断△CEP的形状并说明理由 3如图2把菱形ABCD改为正方形ABCD其他条件不变直接写出线段AP与线段CE的数量关系.
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如图1在等边△ABC中点D是BC边的中点点P为AB边上的一个动点设AP=x图1中线段DP的长为y若表示y与x的函数关系的图象如图2所示则等边△ABC的面积为
小辉根据学习函数的经验对函数y=|x﹣1|的图象与性质进行了探究下面是小辉的探究过程请补充完整 1列表找出y与x的几组对应值. 其中b=在平面直角坐标系中画出该函数的图象 2写出该函数的一条性质.
如图正方形ABCD的边长为8M是AB的中点P是BC边上的动点连结PM以点P为圆心PM长为半径作⊙P. 1当BP=时△MBP~△DCP 2当⊙P与正方形ABCD的边相切时求BP的长 3设⊙P的半径为x请直接写出正方形ABCD中恰好有两个顶点在圆内的x的取值范围.
小英解不等式的过程如下请指出她解答过程中错误步骤的序号并写出正确的解答过程. 解去分母得31+x﹣22x+1≤1①去括号得3+3x﹣4x+1≤1② 移项得3x﹣4x≤1﹣3﹣1③合并同类项得﹣x≤﹣3④ 两边都除以﹣1得x≤3⑤
如图将边长为3a的正方形沿虚线剪成两个正方形和两个长方形.若去掉边长为2b的小正方形后再将剩余部分拼成一个矩形则矩形的周长为
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GetaThoroughUnderstandingofOneself Inallone'slifetimeitisoneselfthatonespendsthemosttimebeingwithordealingwith.1 Whenyouaregoingupwardsinlifeyoutendtooverestimate高估yourself.Itseemsthateverythingyouseekforiswithinyourreach.2It'slikelythatyouthinkitwiseforyourselftostayawayfromtheouterworld.Actuallytogetathoroughunderstandingofoneselfyoumayaswellkeepthefollowingtipsinmind. Gainacorrectviewofoneself.Youmaylookforwardhopefullytothefuturebutbesurenottoexpecttoomuchfordreamscanneverbefullyrealized.Youmaybecourageoustomeetchallengesbutitshouldbecleartoyouwheretodirectyourefforts.3 Self﹣appreciate.Whetheryoucompareyourselftoahighmountainorasmallstoneyourepresentastateofnature.4Ifyouearnestly诚挚地admireyourselfyou'llhavearealsenseofself﹣appreciation. 5Intimeofangerdoyourselfafavorbyreleasing释放itinaquietplacesothatyouwon'tbehurtbyitsflamesintimeofsadnessdoyourselfafavorbysharingitwithyourfriendssoastochangeabadmoodintoacheerfuloneintimeoftirednessdoyourselfafavorbygettingagoodsleep. Getafullcontrolofone'slife.Thenonewillfindone'slifefullofcolorandflavor. A.Ithasitsownvalue. B.Dooneselfafavorwhenit'sneeded. C.Doyourselfafavorwhenyouresisttheattackofillness. D.Butitispreciselyoneselfthatonehastheleastunderstandingof. E.Especiallyifitiswellwithinyourreachyouarejusttooblindtoseeit. F.Whenyouaregoingdownhillyoutendtounderestimateyourself. G.Solongasyouhaveaperfectknowledgeofyourselftherewon'tbedifficultiesyoucan'tovercome.
比较大小32.
如图1在平面直角坐标系xOy中已知点A和点B的坐标分别为A﹣20B0﹣6将Rt△AOB绕点O按顺时针方向分别旋转90°180°得到Rt△A1OCRt△EOF.抛物线C1经过点CAB抛物线C2经过点CEF. 1点C的坐标为点E的坐标为抛物线C1的解析式为.抛物线C2的解析式为 2如果点Pxy是直线BC上方抛物线C1上的一个动点. ①若∠PCA=∠ABO时求P点的坐标 ②如图2过点P作x轴的垂线交直线BC于点M交抛物线C2于点N记h=PM+NM+BM求h与x的函数关系式当﹣5≤x≤﹣2时求h的取值范围.
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下列等式成立的是
随着高铁的建设春运期间动车组发送旅客量越来越大相关部门为了进一步了解春运期间动车组发送旅客量的变化情况针对2014年至2018年春运期间的铁路发送旅客量情况进行了调查过程如下. Ⅰ收集整理数据 请将表格补充完整 Ⅱ描述数据 为了更直观地显示动车组发送旅客量占比的变化趋势需要用填“折线图”或“扇形图”进行描述 Ⅲ分析数据做出推测 预估2019年春运期间动车组发送旅客量占比约为你的预估理由是.
假定你是中国高中生李华今年暑假期间将去澳大利亚悉尼南部Kogarah的一所综合性学校KogarahHighSchool学习一个月并将寄宿在当地的居民Silvia家中.请给Silvia写一封电子邮件询问一些将在Kogarah生活的有关情况.具体询问内容如下 1.住宿是否可以有单间2.房间里是否有网络 3.是否可以自己煮饭4.是否有便利的交通. 注意1.词数100左右 2.可适当增加细节以使行文连贯. 3.开头语和结束语已为你写好不计入总词数. DearSilvia GreetingsfromChina!IanLiHuaahighschoolstudentinChina.. Lookingforwardtoyourreply. Bestwishes. Yourssincerely LiHua.
将一张多边形纸片沿图中虚线剪开如果剪开后得到的两个图形的内角和相等下列四种剪法中符合要求的是
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