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如图,在Rt△ABC中,∠C=90°,AC=4,BC=3,点O是AB的三等分点,半圆O与AC相切,M,N分别是BC与半圆弧上的动点,则MN的最小值和最大值之和是( )
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如图Rt△ABC中∠ABC=90°DE垂直平分AC垂足为O.AD∥BC且AB=3BC=4则AD的长为
如图在Rt△ABC中∠C.=90°AC=3BC=4则AB=_____.
如图在Rt△ABC中∠C.=90°AC=3BC=4则AB=____________sinA.=___
如图在Rt△ABC中∠A.=90°∠ABC的平分线BD交AC于点D.AD=3BC=10则△BDC的面
如图在Rt△ABC中∠A.=90°∠ABC的平分线BD交AC于点D.AD=3BC=10则△BDC的面
在Rt△ABC中∠C.=90°AC=3BC=4以直线AC为轴把△ABC旋转一周得到的圆锥的侧面积是.
在Rt△ABC中∠C.=90°AC=3BC=4则AB=___________
如图在Rt△ABC中∠C=90°AC=3BC=4.现将线段AC沿AD折叠后使得点C.落在AB上求折痕
如图Rt△ABC中∠ABC=90°DE垂直平分AC垂足为O.AD∥BC且AB=3BC=4则AD的长为
如图在Rt△ABC中∠C.=90°若BC=3AC=4则AB的长是______.
Rt△ABC中∠C.=90°AC=3BC=4则△ABC的内切圆半径为________
如图在Rt△ABC中∠ACB=90°以点
为圆心,AC长为半径作圆弧交边AB于点D.若 AC=3,BC=4.则BD的长是( )
A.2
3
4
5
如图4240在Rt△ABC中∠ACB=90°AC=3BC=4以点A.为圆心AC长为半径画弧交AB
在Rt△ABC中∠C.=90°BC=3AC=4那么cosA=.
如图4240在Rt△ABC中∠ACB=90°AC=3BC=4以点A.为圆心AC长为半径画弧交AB
如图在Rt△ABC中∠ABC=90°AB=3AC=5点E.在BC上将△ABC沿AE折叠使点B.落在A
如图在Rt△ABC中∠ACB=90°AC=3BC=4以AC为直径的圆交AB于点D.求BDCD的长.
如图Rt△ABC中∠C=90°若AC=4BC=3则△ABC的内切圆半径r=.
在Rt△ABC中∠C.=90°AB=15BC:AC=3:4则BC=___________
在Rt△ABC中∠C.=90°BC=3AC=4那么cosA的值等于
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为了保护地球人们一直在从自然界中寻求清洁的“绿色”能源请举出一种你熟悉的“绿色”能源并写出其在生产生活中的一项应用.
学校计划为“我和我的祖国”演讲比赛购买奖品.已知购买3个A奖品和2个B奖品共需120元购买5个A奖品和4个B奖品共需210元. 1求AB两种奖品的单价 2学校准备购买AB两种奖品共30个且A奖品的数量不少于B奖品数量的.请设计出最省钱的购买方案并说明理由.
如图在△OAB中顶点O00A﹣34B34将△OAB与正方形ABCD组成的图形绕点O顺时针旋转每次旋转90°则第70次旋转结束时点D的坐标为
10分假定英语课上老师要求同桌之间交换修改作文请你修改你同桌写的以下作文. 文中共有10处语言错误每句中最多有两处.每处错误仅涉及一个单词的增加删除或修改. 增加在缺词处加一个漏字符号^并在其下面写出该加的词. 删除把多余的词用斜线\划掉. 修改在错的词下划一横线并在该词下面写出修改后的词. 注意1.每处错误及其修改均仅限一词; 2.只允许修改10处多着从第11处起不计分. LastAugustIwenttoSacramentoUSA.I'dbelookingforwardtoitforagesbutintheenditturned outtobetheworstholidaysofmylife.Mymotherwasbornherebutshehadn'tbeenbackforvisitfor twentyyearssoshehaddecidedtocomewithoutme.WhenourplanetoucheddownIlookedoutof thewindowincuriositybutshockedtofinditwaspouringdown!Mymumsaidnottoworry astheweathercouldchangeveryquick.InallwespenttwoweeksinSacramento.Believeitornot thesundoesn'tcomeoutevenonce!Insteadofgoingtothebeachorsightseeingwespentmostdays visitingmuseumsandwentshopping.ItcertainlywasnottheholidaythatIhadexpectedfor.
长为300m的春游队伍以vm/s的速度向东行进如图1和图2当队伍排尾行进到位置O时在排尾处的甲有一物品要送到排头送到后立即返回排尾甲的往返速度均为2vm/s当甲返回排尾后他及队伍均停止行进.设排尾从位置O开始行进的时间为ts排头与O的距离为S头m. 1当v=2时解答 ①求S头与t的函数关系式不写t的取值范围 ②当甲赶到排头位置时求S头的值在甲从排头返回到排尾过程中设甲与位置O的距离为S甲m求S甲与t的函数关系式不写t的取值范围 2设甲这次往返队伍的总时间为Ts求T与v的函数关系式不写v的取值范围并写出队伍在此过程中行进的路程.
在△ABC中CA=CB∠ACB=α.点P是平面内不与点AC重合的任意一点.连接AP将线段AP绕点P逆时针旋转α得到线段DP连接ADBDCP. 1观察猜想 如图1当α=60°时的值是直线BD与直线CP相交所成的较小角的度数是. 2类比探究 如图2当α=90°时请写出的值及直线BD与直线CP相交所成的小角的度数并就图2的情形说明理由. 3解决问题 当α=90°时若点EF分别是CACB的中点点P在直线EF上请直接写出点CPD在同一直线上时的值.
购物支付已进入“刷脸”时代如图所示消费者结账时只需面对摄像头相当于一个凸透镜经系统自动拍照扫描等确认相关信息后即可迅速完成交易.下列有关说法正确的是
如图函数y=的图象所在坐标系的原点是
有个填写运算符号的游戏在“1□2□6□9”中的每个□内填入+﹣×÷中的某一个可重复使用然后计算结果. 1计算1+2﹣6﹣9 2若1÷2×6□9=﹣6请推算□内的符号 3在“1□2□6﹣9”的□内填入符号后使计算所得数最小直接写出这个最小数.
8分AreportbytheUS'OpenSyllabusProjectfoundthatthemostreadbooksamongUScollegestudentsinthepastyearwerethelikesofTheRepublicbyancientGreekphilosopherPlatoandTheClashofCivilizationsbyUSpoliticalscientistSamuelHuntington.AndaccordingtoreportsreleasedbyChinesecollegelibrariesthemostpopularbooksamongChinesestudentsarenovelslikeJourneyUndertheMidnightSunbyJapanesewriterKeigoHigashinoandDemi﹣GodsandSemi﹣Devils天龙八部byChineseauthorLouisCha.ThisisconsideredbymanytobeoneofthereasonswhyChinesestudentsaresometimesnotasgoodatcriticalthinkingorobservingglobalperspectivesasUSstudents﹣theyreadtoomanybestsellernovels.'Byreadingtextsinsocialstudiesscienceandotherdisciplinesstudentsbuildafoundationofknowledgeinthesefieldsthatwillalsogivethemthebackgroundtobebetterreadersinallareas'RobertPondisciovicepresidentoftheCoreKnowledgeFoundationintheUStoldTheWashingtonPost.AccordingtoChinaYouthDailythereareusuallyfivestageswhenitcomestoreadingwithpopularnovelsatthebottom.Moreadvancedreadersnormallygoontoreadclassicfictionalliteraturehistoryandphilosophyorbookswithcriticalideas.Thefifthstageinvolvesstudentsmakingtheirownreadinglistsbasedontheideological意识形态的systemstheyhavebuiltthroughouttheyears.Wespendhoursdaysorevenweeksonabooksoit'sonlynaturalthatwewanttolearnsomethingusefulinreturnforourefforts.Manyseereadingasaninvestmentinthemselves.Butthispracticalviewofliteratureandthethoughtthathistoryandphilosophybooksaresuperiortonovelsisnotagreedbyeveryone.Afterallwhattheyofferaretwodifferentkindsofsatisfaction.Whiletheformerprovidesknowledgethelatterbringssentimental情感的experiences.'Fictionandpoetryaremedicines'UKwriterJeanetteWintersononcewrote.'Whattheyhealistherupture裂痕realitymakesontheimagination.'24.Thepurposeofparagraphoneisto.A.comparethepopularbooksbetweentheUSandChinesestudents.B.introducethedifferentdiscoveriesfromChinaandtheUS.C.analyzetheculturaldifferencesofthetwocountries.D.statewhyChinesestudentsaresometimesnotgoodatcriticalthinking25.Toknowsomethingineachareastudentsshouldread.A.famousnovelswhichhaswonmanyprizesB.textsinsocialstudiesandotherdisciplinesC.modernmagazineswhichhavegainedgreatpopularityD.sciencefictionsinvolvingknowledgeinmanyareas26.AccordingtoChinaYouthDailywhichisthehigheststagewhilereading?A.Booksbasedonthereaders'thought.B.Classicfictionalliterature.C.Bookswithcriticalideas.D.Popularnovels.27.Whatcanweinferfromthelasttwoparagraphs?A.Historybooksaresuperiortonovels.B.JeanetteWintersonthoughtfictionandpoetryarealsouseful.C.Philosophybookshelpthereadersgetemotionalexperience.D.Thewriterpreferstoreadthehistoricalandscientificbooks.
8分AboutthreedecadesagoChinawasknownasthe'BicycleKingdom'.Butlateronbikeswerereplacedbytheirfuel﹣poweredcompetitors.ButrecentmonthshaveseenarevivalofthehumblebikeacrossChinawithanincreasingnumberofpeoplechoosingcyclinginsteadofdrivingtoschoolstoworkplacesortodosightseeing.Theintroductionofbike﹣sharingschemespioneeredbystart﹣upslikeOfoandMobikehasbroughtthetrendtoanewlevel.Peoplecanunlockthesharedbikesbysimplyusingtheirsmartphone.ThebikesareequippedwithGPSandcanbeleftanywhereinpublicforthenextuser.They'repopularamongmanyChinesepeopleastheyprovideaneffectivesolutiontothe'lastmile'problemwhichreferstothefinallegofaperson'sjourney.'Inplaceswherethesubwaydoesn'textendwhereit'sdifficulttochangefromonekindoftransporttoanotherit'ssoeasytogetwhereyouwanttogowithMobike'HuHong29toldAFP.ShepedalstoherShanghaireal﹣estatejob.Howevertheschemeshavealsoledtoproblemssuchasillegalparkingvandalismandtheft.LastmonthtwonursesinBeijingwereplacedunderadministrativepunishmentforfivedaysforputtinglocksontwosharedbikes.AndinDecemberamanwhostoleasharedbikewassentencedtoa3﹣monthdetentionwitha3﹣monthprobationandfined1000yuanbytheShanghaiMinhangPeople'sCourt.'Bike﹣sharingisagreenermethodoftransportationandprovidesauser﹣friendlyexperience'saidLiuXiaomingvice﹣ministeroftransport.'Butit'sacombinationofonlineandofflinebusiness.Operatorsareusuallystronginonlineservicesbutlackofflinebusinessexperiencewhichcausesproblems.'Todealwiththeseproblemsthecompanycameupwiththeideaofencouragingpeopletoreturnthebikestostationsbyrewardingfreetimefortheirnextrides.32.Whohasbroughttherevivalofbiketoanewlevel?A.ThelocalgovernmentB.ThebusinessmanC.ThestudentsandworkersD.Thepioneeredstart﹣ups33.Whichofthefollowingdoesn'tbelongtothe'lastmile'problem?A.Missingthebusinessplanefortrafficjam.B.Togettosomewherethesubwaydoesn'treach.C.Havingtroublesinchangingfrombustotaxi.D.Havingno'finalleg'ofaperson'stravel.34.Whatreasoncausesmanyproblemsinbike﹣sharing?A.Somepeoplemakedamagetothebikesonpurpose.B.Operatorslackofflinebusinessexperience.C.Thebike﹣sharingbusinessistoocomplicatedtorun.D.Therearenorelativelawsonthisbusiness.35.What'sthebesttitleofthispassage?A.BicycleKingdombecamefamousagain.B.Anewwayoftransportation.C.Ridingbikesforfree.D.Bikespedalingbackintostyles.
图2是图1中长方体的三视图若用S表示面积S主=x2+2xS左=x2+x则S俯=
成人每天维生素D的摄入量约为0.0000046克.数据“0.0000046”用科学记数法表示为
下列计算正确的是
2019年5月17日我国用火箭将第45颗北斗导航卫星成功发射.火箭在穿越大气层时剧烈升温通过 的方式增大了它的内能卫星升入太空后利用选填“超声波”或“电磁波”传递信息.
一款5G手机的折叠屏由柔性发光二极管制成其中制成发光二极管的材料是
已知抛物线y=﹣x2+bx+4经过﹣2n和4n两点则n的值为
如图若b是正数直线ly=b与y轴交于点A直线ay=x﹣b与y轴交于点B抛物线Ly=﹣x2+bx的顶点为C且L与x轴右交点为D. 1若AB=8求b的值并求此时L的对称轴与a的交点坐标 2当点C在l下方时求点C与l距离的最大值 3设x0≠0点x0y1x0y2x0y3分别在la和L上且y3是y1y2的平均数求点x00与点D间的距离 4在L和a所围成的封闭图形的边界上把横纵坐标都是整数的点称为“美点”分别直接写出b=2019和b=2019.5时“美点”的个数.
如图在扇形AOB中∠AOB=120°半径OC交弦AB于点D且OC⊥OA.若OA=2则阴影部分的面积为.
某校为了解七八年级学生对“防溺水”安全知识的掌握情况从七八年级各随机抽取50名学生进行测试并对成绩百分制进行整理描述和分析.部分信息如下 a.七年级成绩频数分布直方图 b.七年级成绩在70≤x<80这一组的是 7072747576767777777879 c.七八年级成绩的平均数中位数如下 根据以上信息回答下列问题 1在这次测试中七年级在80分以上含80分的有人 2表中m的值为 3在这次测试中七年级学生甲与八年级学生乙的成绩都是78分请判断两位学生在各自年级的排名谁更靠前并说明理由 4该校七年级学生有400人假设全部参加此次测试请估计七年级成绩超过平均数76.9分的人数.
一次抽奖活动特等奖的中奖率为把用科学记数法表示为
先化简再求值﹣1÷其中x=.
一元二次方程x+1x﹣1=2x+3的根的情况是
30分Welostanothertreeinourlaststormanditbrokemyheart.Wehavelostmanytreesthroughtheyearsbutthisonewas41.About17yearsagoIplanted10Canadianbluespruceseedlings树苗alongthedriveways.AndIdidallIcouldto42them.Shortlyafterthatastormrippedthroughourareaand43manytrees.Myseedlingssurvived.Butwhenwedecidedto44ourneighborinsellingourdownedtreeswehadto45theseedlingstokeepthemfromgettingdestroyed.46fiveofthe10bluesprucetreesdidn'tsurvivebeingmoved.Ofthefivethat47threewereinourfrontyardwhereIcouldwatchthemgrowintomaturetreesfrommyfrontwindow.WhenoneofthebigDouglasfirs花旗松thattowered48themdiedwedecidedtocutitdownbeforeitfell.Aftermuch49myhusbandandmysondecidedtheycoulddropitwithout50anyofthebluesprucetrees.Iwatched51asthedramaunfoldedprayingthewholetimeI52thechainsaw电锯.Thefirfellrightbetweentwoofthem53plannedandmytreescontinuedtogrow.ThenonenightIwaslyinginbedduringyetanother54andheardaloudnoisefollowedbythesoundofatreecrashingdown.ThenextmorningI55tofindthelargestofourbluespruceslyingontheground;Iwasincrediblyupset.For17yearsI'd56watchingitgrowfromaseedlingtoatreenearly40feettall.Nowitwas57.Losingmytreewashardto58eventhoughIknewitwasnature'sway.IalsoknewtherewasonlyonethingIcoulddoaboutit.Another10newseedlingsrecentlyarrived.Iplantedthemina59spotclosetothehouse.Whenthey'realittlelargerI'lltransplantthemtoapermanentspotwhereIcan60themgrowtallandbeautiful.41.A.significant B.different C.valuable D.unaffordable42.A.protect B.grow C.attend D.develop43.A.rippedoff B.stoleaway C.tookdown D.blownup44.A.persuade B.resist C.appreciate D.join45.A.cover B.transplant C.move D.preserve46.A.Disappointedly B.Consequently C.Unexpectedly D.Sadly47.A.left B.lived C.moved D.sold48.A.upon B.down C.over D.through49.A.debate B.design C.measure D.consideration50.A.stretching B.reaching C.threatening D.hitting51.A.breathlessly B.excitedly C.attentively D.carefully52.A.held B.stuck C.heard D.operated53.A.after B.as C.when D.though54.A.nightmare B.drama C.windstorm D.weekend55.A.woke B.happened C.rushed D.came56.A.accustomed B.finished C.managed D.enjoyed57.A.fallen B.gone C.done D.lost58.A.believe B.endure C.accept D.adapt59.A.secret B.safe C.convenient D.hidden60.A.accompany B.watch C.imagine D.shelter
某球室有三种品牌的4个乒乓球价格是789单位元三种.从中随机拿出一个球已知P一次拿到8元球=. 1求这4个球价格的众数 2若甲组已拿走一个7元球训练乙组准备从剩余3个球中随机拿一个训练. ①所剩的3个球价格的中位数与原来4个球价格的中位数是否相同并简要说明理由 ②乙组先随机拿出一个球后放回之后又随机拿一个用列表法如图求乙组两次都拿到8元球的概率.
不等式组的解集是.
在家用电器调查活动中小亮让电热水器单独工作2min测得家中如图所示的电能表的转盘转了70r热水器的实际功率为W若不计能量损失这段时间内热水器中50L的水可升温℃.由于热水器的功率远大于冰箱从安全用电的角度考虑热水器的电源线比冰箱的要选填“粗”或“细”. [已知ρ水=1.0×103kg/m3c水=4.2×103J/kg•℃]
对于题目“如图1平面上正方形内有一长为12宽为6的矩形它可以在正方形的内部及边界通过移转即平移或旋转的方式自由地从横放移转到竖放求正方形边长的最小整数n.”甲乙丙作了自认为边长最小的正方形先求出该边长x再取最小整数n. 甲如图2思路是当x为矩形对角线长时就可移转过去结果取n=13. 乙如图3思路是当x为矩形外接圆直径长时就可移转过去结果取n=14. 丙如图4思路是当x为矩形的长与宽之和的倍时就可移转过去结果取n=13. 下列正确的是
如图约定上方相邻两数之和等于这两数下方箭头共同指向的数. 示例即4+3=7 则1用含x的式子表示m= 2当y=﹣2时n的值为.
根据圆规作图的痕迹可用直尺成功找到三角形外心的是
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