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根据有理数乘法(除法)法则可知: ①若ab>0(或>0),则或; ②若ab<0(或<0),则或. 根据上述知识,求不等式(x﹣2)(x+3)>0的解集 解:原不等式可化为:(1)或(2). ...
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自学下面材料后解答问题.分母中含有未知数的不等式叫分式不等式.如<0等.那么如何求出它们的解集呢根据
设⊕是R上的一个运算A是R的非空子集若对任意ab∈A有a⊕b∈A则称A对运算⊕封闭.下列数集对加法减
自然数集
整数集
有理数集
无理数集
先阅读理解下面的材料和例题再按要求解答问题. 1我们学习了有理数的乘法知道有理数的乘法法则两数相
有理数的乘法法则 0×2=
根据有理数的除法符号法则两数相除同号得正异号得负求不等式的解集.
有理数乘法法则两数相乘同号得______异号得______并把绝对值______任何数同零相乘都得0
阅读下面的分析与计算过程:计算:×82014.若根据有理数的混合运算法则先计算乘方再计算乘法明显看出
如图根据有理数abc在数轴上的位置下列关系正确的是
b>c>0>a
a>0>c>b
b>a>c>0
c<0<a<b
下列说法中不正确的是
有最小正整数,没有最小的负整数
若一个数是整数,则它一定是有理数
0既不是正有理数,也不是负有理数
正有理数和负有理数组成有理数
有理数的除法法则除以一个数等于乘以这个数的______;
自学下面材料后解答问题分母中含有未知数的不等式叫分式不等式如等那么如何求出它们的解集呢根据我们学过的
如图根据有理数abc在数轴上的位置下列关系正确的是
c>a>0>b
a>b>0>c
b>0>a>c
b>0>c>a
下列说法错误的是
若a.b互为相反数,则a+b=0
若a<0,b<0,则|a+b|=-(a+b)
若a<0,b>0,则ab=-|ab|
若a为有理数,则|a|>a
下列说法正确的是
0是最小的数
互为相反数的两个数的和为0
有理数分为整数、分数和0
有理数分为非负有理数和正有理数
若一个有理数的平方根与立方根是相等的则这个有理数一定是
0
1
0 或 1
0 和±1
如图根据有理数abc在数轴上的位置下列关系正确的是
c>a>0>b;
a>b>0>c ;
b>0>a >c;
b>0>c>a
有理数的乘法法则 -3×0=
若一个有理数的平方根与立方根是相等的则这个有理数一定是
0
1
0或1
0和±1
如图所示根据有理数abc在数轴上的位置下列关系正确的是
b>a>0>c
a<b<0<c
b<a<0<c
a<b<c<0
如图根据有理数abc在数轴上的位置下列关系正确的是
b>c>0>a
a>0>c>b
b>a>c>0
c<0
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如图△ABC内接于⊙OAB为直径作OD⊥AB交AC于点D延长BCOD交于点F过点C作⊙O的切线CE交OF于点E. 1求证EC=ED 2如果OA=4EF=3求弦AC的长.
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At15IhadstartedabandwiththreematesI'dmetatthelocalrehearsal排练rooms.WeplayedourfirstperformanceatapubinBolton.Wewere1butthecrowddidn'tseemtomindandafterafewmorelocalconcertswerecordedsomesongsandwestartedto2.Wesentouthundredsofdemo样本tapesin3ofourfavouritebandtheManics.AfterfinishingmyhighschoolwedrovetoLondontoplayattheDublinCastle.Onlyfivepeople4.Butwepersevered坚持andslowlythingsbeganto5.Twoyearsafterourfirstperformancewe6arecorddeal.We7endlesslyforthenexttwoyearsandbuiltupasmallbut8following.Attheendof2002theManics9ustoplaywiththem.Myteenagedreamshadcometrue;thebandIlookeduptoseemedto10ofus.We11performinginNewYorkandto5000peopleattheFujiRockfestivalinJapan.There'snogreater12thanthemomentyousteponstage.Thelightsdarkenthecrowdswells波浪起伏andthey13inapplauseasyoufinish.Ouralbumwas14in2003.Unfortunatelynooneboughtthething.15Ithinkthatwasaboutright.16I'mextremelyproudofthemusicweproducedwewereridingawaveofhype天花乱坠的宣传wecould17liveupto.Ourrecordcompanyquietly18usandasquicklyasithadstartedmytimeinabandwasover.We19peacefullyonthedayitwasreleased.Weevenhada'lastsupper'tomarkourdemise停业.Thebandhad20everything.MyoldschoolwelcomedmebackandIworkedharderandwasfinallyadmittedtoOxfordUniversityatthegrandoldageof21.1A.troublesome B.thrilled C.hopeful D.terrible2A.hesitate B.succeed C.dream D.qualify3A.imitation B.favour C.charge D.celebration4A.droppedout B.turnedup C.divedin D.passedby5A.catchon B.takeoff C.pickup D.getround6A.declined B.lost C.expected D.signed7A.practiced B.studied C.toured D.waited8A.separated B.devoted C.concerned D.relieved9A.persuaded B.required C.reminded D.invited10A.approve B.tire C.hear D.think11A.gaveup B.endedup C.putoff D.insistedon12A.risk B.pain C.loss D.rush13A.erupt B.gather C.squeeze D.withdraw14A.preserved B.released C.displayed D.evaluated15A.Lookingforward B.Lookingdown C.Lookingback D.Lookingup16A.Though B.Since C.Unless D.Before17A.actually B.somehow C.always D.never18A.betrayed B.dropped C.impressed D.sponsored19A.splitup B.hungaround C.movedaway D.brokedown20A.experienced B.disturbed C.changed D.replaced
某数学兴趣小组要测量实验大楼部分楼体的高度如图①所示CD部分在起点A处测得大楼部分楼体CD的顶端C点的仰角为45°底端D点的仰角为30°在同一剖面沿水平地面向前走20米到达B处测得顶端C的仰角为63.4°如图②所示求大楼部分楼体CD的高度约为多少米精确到1米参考数据sin63.4°≈0.89cos63.4°≈0.45tan63.4°≈2.00≈1.41≈1.73
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如图AB是⊙O的直径C是⊙O上一点过点O作OD⊥AB交BC的延长线于D交AC于点EF是DE的中点连接CF. 1求证CF是⊙O的切线. 2若∠A=22.5°求证AC=DC.
Someofthegreatestmomentsinhumanhistorywerefueledbyemotionalintelligence.WhenMartinLutherKingJr.presentedhisdreamhechoselanguagethatwouldstirtheheartsofhisaudience.Deliveringthiselectrifying震撼性的messagerequiredemotionalintelligence﹣theabilitytorecognizeunderstandandmanageemotions.Emotionalintelligencehasbeenhighlyrecommendedbyleaderspolicymakersandeducatorsasthesolutiontoawiderangeofsocialproblems.Ifwecanteachourchildrentomanageemotionstheargumentgoeswe'llhavelessbullyingandmorecooperation.Ifwecancultivateemotionalintelligenceamongleadersanddoctorswe'llhavemorecaringworkplacesandmorecompassionatehealthcare.Emotionalintelligenceisimportantbuttheuncontrolledenthusiasmhasobscured掩盖adarkside.Newevidenceshowsthatwhenpeoplesharpentheiremotionalskillstheybecomebetteratmanipulating把持others.Whenyou'regoodatcontrollingyourownemotionsyoucanhideyourtruefeelings.Whenyouknowwhatothersarefeelingyoucanmotivatethemtoactagainsttheirownbestinterests.Socialscientistshavebeguntodocumentthisdarksideofemotionalintelligence.InaresearchledbyUniversityofCambridgeprofessorJochenMengeswhenaleadergaveaninspiringspeechfilledwithemotiontheaudiencewaslesslikelytoscrutinize细察themessageandrememberedlessofthecontent.Ironically讽刺的是audiencemembersweresomovedbythespeechthattheyclaimedtorecallmoreofit.Theauthorscallthistheawestruckeffectbutitmightjustaseasilybedescribedasthedumbstruckeffect.OneobserverreflectedthatHitler'spersuasiveimpactcamefromhisabilitytostrategicallyexpressemotions﹣hewould'tearopenhisheart'﹣andtheseemotionsaffectedhisfollowerstothepointthattheywould'stopthinkingcriticallyandjustemote.'Leaderswhomasteremotionscanrobusofourcapacitiestoreason.Iftheirvaluesareoutofstepwithourowntheresultscanbedestructive.Newevidencesuggeststhatwhenpeoplehaveself﹣servingmotives动机emotionalintelligencebecomesaweaponformanipulatingothers.InastudyledbytheUniversityofTorontopsychologistStéphaneCoteuniversityemployeesfilledoutasurveyabouttheirMachiavellian不择手段的tendenciesandtookatestmeasuringtheirknowledgeabouteffectivestrategiesformanagingemotions.ThenCote'steamassessedhowoftentheemployeesdeliberatelyundermined逐渐削弱theircolleagues.TheemployeesinvolvedinthemostharmfulbehaviorswereMachiavellianswithhighemotionalintelligence.Theyusedtheiremotionalskillstolowerthedignityoftheirpeersforpersonalgain.ShiningalightonthisdarksideofemotionalintelligenceisonemissionofaresearchteamledbyUniversityCollegeLondonprofessorMartinKilduff.Accordingtotheseexpertsemotionalintelligencehelpspeopledisguise伪装onesetofemotionswhileexpressinganotherforpersonalgain.ProfessorKilduff'steamwrites.'Thestrategicdisguiseofone'sownemotionsandthemanipulationofothers'emotionsforstrategicendsarebehaviorsevidentnotonlyonShakespeare'sstagebutalsointheofficesandcorridorswherepowerandinfluencearetraded.'Ofcoursepeoplearen'talwaysusingemotionalintelligencefornefariousends.Moreoftenthannotemotionalskillsaresimplyinstrumentaltoolsforgoalaccomplishment.AresearchteamdiscoveredthatfounderAnitaRoddickusedemotionalintelligencetoinspireheremployeestofundraiseforcharity.AsRoddickexplained'Wheneverwewantedtopersuadeourstafftosupportaparticularprojectwealwaystriedtobreaktheirhearts.'Thereisgrowingrecognitionthatemotionalintelligence﹣likeanyskill﹣canbeusedforgoodorevil.Soifwe'regoingtoteachemotionalintelligenceinschoolsanddevelopitatworkweneedtoconsiderthevaluesthatgoalongwithitandwhereit'sactuallyuseful.1WhydoestheauthormentionMartinLutherKingJr.?A.Tohonorthegreatleaderforhiscourage.B.Torecommendhisspeechtootherleaders.C.Toimpressthereaderswithamajortopic.D.Toadvocateasocietywithfewerproblems.2Whichofthefollowingbelongstoadarksideofemotionalintelligence?A.Developingthecapabilitytocontrolone'sownemotion.B.Inducingpeopletodowhatbringsdisadvantagestothem.C.Appealingtotheaudiencetoconcentrateandremembermore.D.Encouragingthemovedaudiencetorecallmoreofthespeech.3WhatisthedumbstruckeffectofHitler'semotionalintelligence?A.Hisfollowerswouldtearopentheirheartstohim.B.Hisfollowerswouldexpressemotionsstrategically.C.Hisfollowerswouldlosetheabilitytoreasonproperly.D.Hisfollowerswoulddeveloptheself﹣servingmotives.4Howdopeopleusetheiremotionalintelligenceforpersonalgain?A.Theydisguisetheiremotionstoearnothers'trust.B.Theyhelptheircolleaguestobuildupconfidence.C.Theypresenttheirstrategicbehaviorsonthestage.D.Theylowertheirowndignitytogainpopularity.5WhichmaymeanthesameastheunderlinedwordinParagraph8?A.Immoral.B.Unimportant.C.Illegal.D.Uncontrollable.6Whatwouldbethebesttitleforthepassage?A.ThebenefitsofemotionalintelligenceB.Thewaysofdisguisingone'semotionsC.ThereasonsforusingemotionalskillsD.Thedarksideofemotionalintelligence
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|﹣2019|=
计算﹣a﹣1的正确结果是
计算1﹣+÷.
如图⊙O中=∠ACB=75°BC=2则阴影部分的面积是
如图在Rt△ABC中∠ACB=90°∠B=60°DE为△ABC的中位线延长BC至F使CF=BC连接FE并延长交AB于点M.若BC=a则△FMB的周长为.
用1块A型钢板可制成4件甲种产品和1件乙种产品用1块B型钢板可制成3件甲种产品和2件乙种产品要生产甲种产品37件乙种产品18件则恰好需用AB两种型号的钢板共块.
将a3b﹣ab进行因式分解正确的是
如图所示的几何体的左视图是
争创全国文明城市从我做起某学校在七年级开设了文明礼仪校本课程为了解学生的学习情况学校随机抽取30名学生进行测试成绩如下单位分 788386869094979289868481818486889289868381818586899393898593 整理上面的数据得到频数分布表和频数分布直方图 回答下列问题 1以上30个数据中中位数是频数分布表中a=b= 2补全频数分布直方图 3若成绩不低于86分为优秀估计该校七年级300名学生中达到优秀等级的人数.
不等式1﹣2x≥0的解集是
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下列计算错误的是
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