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分解因式：2a2+4a+2＝ ．
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分解因式2a2-2=.
分解因式a+2a﹣2+3a=______.
我们已经学过将一个多项式分解因式的方法有提公因式法和运用公式法其实分解因式的方法还有分组分解法拆项法
分解因式a3-ab2=
分解因式2a2﹣2=.
因式分解a2﹣2a=
分解因式－24x3－12x2+28x.
先阅读下面的材料再因式分解要把多项式am+an+bm+bn因式分解可以先把它的前两项分成一组并提出a
解下列方程①2x2－18＝0②9x2－12x－1＝0③3x2＋10x＋2＝0④25x－12＝25x－
①直接开平方法，②配方法，③公式法，④因式分解法
①直接开平方法，②公式法，③、④因式分解法
①因式分解法，②公式法，③配方法，④因式分解法
①直接开平方法，②、③公式法，④因式分解法
分解因式2a2﹣2=.
分解因式x2x﹣2﹣16x﹣2
先因式分解123再解答后面的问题.11+a+a1+a.21+a+a1+a+a1+a2.31+a+a1
分解因式-2m3+24m2-72m.
分解因式2﹣2a2=______.
分解因式2a2﹣4a+2=
分解因式2a2－2ab=_______.
在下列分解因式的过程中分解因式正确的是.
分解因式m2a﹣2+m2﹣a=
分解因式m2-n2+2n-1=
分解因式16x4+24x2+9
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在正六边形ABCDEF中若边长为3则正六边形ABCDEF的边心距为．
已知二次函数y＝ax2+bx﹣2aa≠0的图象经过点A1nB3n且当x＝1时y＞0．若M﹣2y1N﹣1y2P7y3也在该二次函数的图象上则下列结论正确的是
如图平行四边形ABCD中AB＝2AD＝2且AD⊥BD一动点P在AB上方且∠APB＝60°AP与BD交于点E则的最大值为
下列计算正确的是
如图抛物线Ly＝﹣x2+bx+c与x轴分别交于A﹣10B40两点． 1求抛物线的解析式以及顶点坐标 2在第二象限内作矩形ADCE且AD＝2CD＝4将抛物线x轴向左平移当点C落在平移后的抛物线L′上时求平移后的抛物线L′的解析式 3在2的条件下当点M是抛物线L的对称轴上一点试探究在抛物线L向左平移第一次过点C时抛物线L′上是否存在点Q使以点O点B点M点Q为顶点的四边形是平行四边形若存在请写出点Q的坐标若不存在请说明理由．
2019年5月4日据初步统计测算“五一”当天重庆共接待境内外游客2551万人次这个数据用科学记数法表示为人次．
下列命题中错误的是
在校园文化艺术节中九年级一班有1名男生和2名女生获得美术奖另有2名男生和2名女生获得音乐奖． 1从获得美术奖和音乐奖的7名学生中选取1名参加颁奖大会求刚好是男生的概率 2分别从获得美术奖音乐奖的学生中各选取1名参加颁奖大会用列表或树状图求刚好是一男生一女生的概率．
下列图形都是同样大小的小三角形按一定规律所组成的其中第①个图形中一共有2个小三角形第②个图形中一共有4个小三角形第③个图形中一共有7个小三角形…则第⑨个图形中小三角形的个数有
Arubaisoneofthemostwell﹣knownCaribbeandestinationsfortouristsaroundtheworld. You'reprobablywonderingwhattoincludeaswellaswhattowearwhileyou'reinAruba. Clothes Themainreasonwhyyou'reheadingthereistorelaxonthecountry'sfreshbeachesandjoyinwarmwatersoftheCaribbeanSea.Duringmostofthedayyou'lllikelybewearingyourswimsuit.Whenyou'refinishedatthebeachorpoolareaitisadvisabletobringalongashirtorcoveraswellasshortstowear. Itisnotrecommendedtowearbeachclotheswhenyougooutfordinner﹣regardlessofthetimeofday.ShortsandT﹣shirtsareenoughinmanyrestaurantsalthoughmoreformalclothesareadvisedforthefanciesteatingestablishments. Whatelsetobring? TheCaribbeansunisverystrongandifyou'replanningonspendinglotsoftimeinthesunthereareseveralprecautionsyoumusttake.Includesuncreamsunglassesawidehatacoupleofbathingsuitsaswellasabeachbagandacoolerinyourluggage. WhatNOTtobring? WhiledrinkingwaterisquestionableornotsafeinmanyCaribbeannationsArubaisanexception.Arubaisknownforhavingthecleanestwaterintheworld.Thereisnoneedtobringwatersimplybringalonganemptybottle. SeveralitemsareprohibitedinArubaforcarrying.Theseincludefirearmse﹣cigarettesaswellassharpobjectsandtools. 1TouristschooseArubaforadestinationmainlybecause. A.theycanwearcasualclothesfreely B.theycanenjoythebeautifulscenery C.theycanrelaxonthebeachandinwaters D.theycanhaveawonderfuldinnerpartythere 2WhichofthefollowingisnotadvisedtodoinAruba? A.WearingaT﹣shirtinarestaurant. B.Preparingsuncreaminadvance. C.Wearingbeachclothesfordinner. D.Takingalongsunglassesbeforegoingout. 3Thepurposeofthetextisto. A.provideinformationfortourists B.offeradviceontravellinginAruba C.attractmoretouriststotravelinAruba D.warntouristsagainstdoingwrongthings
如图AD是⊙O的切线A为切点．点C在⊙O上连接BC并延长交AD于点D若∠AOC＝70°则∠ADB＝
如图已知AB和CD是⊙O的两条等弦．OM⊥ABON⊥CD垂足分别为点MNBADC的延长线交于点P联结OP．下列四个说法中 ①②OM＝ON③PA＝PC④∠BPO＝∠DPO正确的个数是
图1和图2中所有的正方形都全等将图1的正方形放在图2中的①②③④某一位置所组成的图形不能围成正方体的位置是
ImpressionWestLakeisagrandeveningshowofmusiclightanddance.DirectedbyZhangYimoutithasbeenupdatedsince2015.Includedinthenewversion1be70percentofelements要素fromHangzhouG20Summiteveninggain. ImpressionWestLakeshowingthelocalcultureofHangzhouandtheuniquecharmoftheWestLakeisoneofChina'sTopSevenShows.It2impressivepresentsthehistoryandcultureoftheWestLakeby3explorethestoriesbasedontheLegendofWhiteSnakeandButterflyLovers. BesidesasacharmingshowImpressionWestLakealsohighlightsthebeautiful4naturelandscape风景oftheWestLake.Thewholeperformanceisstagedentirelyuponthelakeitselfwith5hillasthebackground.6isevenmoreamazingistheRainoftheWestLakewhichisartificiallyrecreated7bringoutthecharmoftheWestLakeintherain. ImpressionWestLakeisalsoafeastofmusic.8isreportedthebackgroundmusicismadebyKitaroafamousJapanesemusicianandthethemesong9performbyZhangLiangyingapopularChinesesinger10apleasantandenjoyablevoice.Allthesebringtheaudienceintothedreamlikeenvironmentofromantic浪漫的Hangzhou.
5月26日2019中国国际大数据产业博览会以下简称“数博会”在贵阳隆重开幕．为了解民众对华为麒麟芯片和天罡芯片的认知程度在数博会期间华为在两个芯片的展区各随机调查了20名参会观众并填写了对该展区芯片的认知程度的调查问卷共10题每题1分共10分问卷调查得分不低于8分的观众可获华为发放的奖品一份． 数博会后对问卷得分进行整理分析给出了下面部分信息 ①绘制了麒麟芯片频数分布直方图和天罡芯片扇形统计图如下得分用x表示数据分组为A0≤x＜2B2≤x＜4C4≤x＜6D6≤x＜8E8≤x≤10 ②麒麟芯片问卷得分B组中6名观众的全部得分是223333且另外四组的总得分为54分 ③天罡芯片问卷得分E组中最低分为9分且仅有一人 ④两组问卷得分的平均数中位数众数满分率获奖率如下表 根据以上信息解答下列问题 1扇形统计图中a＝信息④的表中平均数m＝中位数n＝天罡芯片满分率p%＝ 2通过以上数据分析你认为参会观众对填“麒麟”或“天罡”的认知程度更高并写出理由理由1理由2 3请估计数博会期间每天参与麒麟芯片问卷调查的5000名观众获得奖品的总份数约是多少
1x﹣2y2﹣x﹣2yx+2y 2x+1﹣+
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如图在△ADE中BC∥DEAB＝3BD＝DE＝6则BC的长是
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如图某数学兴趣小组为测量一棵古树BH和教学楼CG的高先在A处用高1.5米的测角仪测得古树顶端H的仰角∠HDE为45°此时教学楼顶端G恰好在视线DH上再向前走7米到达B处又测得教学楼顶端G的仰角∠GEF为60°点ABC三点在同一水平线上．1计算古树BH的高2计算教学楼CG的高．参考数据≈1.4≈1.7
国际油价随着供需关系持续波动特别是主要产油国的日产量会影响油价的走势某段时间某石油输出大国每天石油的日产量约为1200万桶时石油的国际油价是每桶56美元每桶成本约为40美元．据统计当日产量减少50万桶时每桶国际油价将会提高7美元但当每桶价格高于100美元时石油需求量又会大幅减少从而严重影响该国的国家经济 1若某段时间该国当日的石油日产量最多1050万桶则国际石油的价格最低是多少美元桶 2该国为了实现一天的利润为3300万美元则日产量是多少万桶
Imagineyouareopeningyourowncompanyandwanttohireamanager.Youhavetwoapplicantsandtheyarebothskilledandexperiencedsowhowouldyouratherhire:JuliaWatsonorShobhaBhattacharya?ChancesarcthatyouwouldpreferWalsonright?Butwhy? EasynamesareregardedasmorefamiliarlessriskyandlessdangerousErynNewmanascientistatVictoriaUniversityofWellingtonNewZealandtoldScientificAmerican.Asaresultpeoplewitheasiernamesareoftenconsideredtobemoretrustworthy. ThisiswhatNewmanandherteammateshavefoundintheirrecentstudy.Intheexperimenttheypicked218differentforeignnamesincludingdifficult﹣to﹣pronounceoneslikeYevgeniDherzhinskyandeasynameslikeBodoWallmeyer.Theythenattachedeachnamewithastatementsuchasturtlesaredeafandgiraffesaretheonlymammalsthatcannotjumpandaskedvolunteerswhethertheythoughtthestatementsweretrue.Theresultsshowedthatstatementsconnectedtoeasiernamesweremoreoftenrankedasbelievablethanthosebelongingtodifficultnamesregardlessofwhatthetruthreallywas. Infactpreviousstudieshavealreadyfoundthatourjudgmentsaboutproductscanbeaffectedbytheirnames.Forexamplewetendtothinkofafoodadditivewithaneasiernameassaferandastock股票withaneasiernameasmoreprofitable赢利的accordingtoMedicalDaily.Butresearcherspointedoutthatthiseffectcanchangedependingonwheresomeonecomesfrom.ForexampleanativeBritishmanmayfindYevgeniDherzhinskyhardtopronouncewhileRussianpeoplecansayitwithouteffort. Newmanhopesthatthisfindingcanmakeusbetterseeourbias.It'snotjustunfairtopeoplethatwemakejudgmentsbasedonfeelingsratherthanfacts﹣itcansometimeshaveseriousresults.Forexamplewemaychoosetobelievecertaineyewitnessesincourtsimplybecausetheirnamessoundmoretrustworthyeveniftheyareactuallylying.Orwemayletgoofqualifiedjobapplicantsduetotheirdifficultnames. NowifyoucouldmakethatdecisionagainwouldyoustillpreferJuliaWatsontoShobhaBhattacharya? 1WhydoestheauthorrefertothechoicebetweenthetwonamesinParagraph1? A.Tointroducehowtochooseagoodapplicant. B.Toshoweasynamesareconsideredmorerisky. C.Toexplainwhatkindsofapplicantsareconsideredreliable. D.Tomakereaderswonderwhyapplicantswitheasynamesarepreferred. 2WhatdidNewmanandherteammatesdiscoverintheirexperiment? A.Hard﹣to﹣pronouncenamesdidn'tinfluencehowthevolunteersjudged. B.Statementspairedwitheasynameswereratedasreliableinmanycases. C.Volunteerswitheasiernamesweremorelikelytochoosetruestatements. D.Statementsconnectedwithdifficultnamesweremoretrustedbyvolunteers. 3TheunderlinedwordbiasinParagraph5probablymeans A.realfact B.wisejudgment C.goodunderstanding D.unreasonablepreference 4Whatcanbeconcludedfromthepassage? A.Weshouldthinktwicebeforewemakeadecision. B.Russianshavemorefairnesstopeople'snamesthantheBritish. C.Judgingpeoplebasedontheirnamesmaycauseseriousproblems. D.Theharderyournameispronouncedthemorelikelyyouwillgetajob.
Manyscientistsbelieveourloveofsugarmayactuallybeanaddiction瘾.Whenweeatordrinksugaryfoodsthesugarentersourbloodandaffectspartsofourbrainwhichmakesusfeelgood.Thenthegoodfeelinggoesawayleavinguswantingmore.1Inthiswayitisinfactanaddictivedrugonethatdoctorssuggestweallcutdownon. ItseemslikeeverytimeIstudyanillnessandsearchforthefirstcauseIfindmywaybacktosugarsaysscientistRichardJohnson2Why?SugarwebelieveisoneofcausesoftheproblemifnotthemajorreasonsaysJohnson. Ourbodiesaredesignedtosurviveonverylittlesugar.Earlyhumansoftenhadverylittlefoodsoourbodieslearnedtobeveryefficientinstoringsugarasfat.Inthiswaywehadenergystoredforwhentherewasnofood.Buttodaymostpeoplehavemorethanenough.3Wellwhatisthesolution?It'sobviousthatweneedtoeatlesssugar.4Frombreakfastcereals谷物toafter﹣dinnerdessertsourfoodsareincreasinglyfilledwithit. 5Manyschoolsarereplacingsugarydessertswithhealthierfoodlikefruit.Otherschoolsarcgrowingtheirownfoodingardensorbuildingfacilities设施likewalkingtrackssostudentsandothersinthecommunitycanexercise. A.Buttherearethosewhoarefightingbackagainstsugar. B.High﹣sugarfoodscannegativelyaffectyourenergylevels. C.Sotheverythingthatoncesavedusmaynowbekillingus. D.Alltastyfoodsdothisbutsugarhasaparticularlystrongeffect. E.Thetroubleisintoday'sworldit'sextremelydifficulttoavoid. F.Theaveragepersontakesinabout24kilogramsofsugareachyear. G.1/3ofadultsworldwidehavehighbloodpressureand2.5billionsufferfromobesity.
如图▱ABCD的对角线ACBD相交于点OE是AB中点且AE+EO＝4则▱ABCD的周长为
如图1在▱ABCD中BE⊥BC交AD于E且BE＝BCCF平分∠BCD交AB于F交BE于G连接EF． 1若∠A＝60°CG＝4求EF的长 2如图2若BM平分∠ABE交GF于点M且EF＝GB求证AE+FM＝CD．
取一定质量含杂质的氢氧化镁向其中加入稀硫酸至恰好完全反应杂质不溶于水也不参加反应过滤后得到300g质量分数为20%的硫酸镁溶液．计算 1生成硫酸镁的质量． 2根据化学方程式计算参加反应的硫酸的质量． 3所加稀硫酸的溶质质量分数．计算结果保留到1%
如图矩形ABCD中AD＝3AB＝18EF分别为ADBC上一点连接EF将四边形AEFB沿EF翻折使AB的对应点A′B′与C在一条直线上A′E交BC于G若AB＝BF则GC长．
如图点EF在BC上BE＝CFAB＝DC∠B＝∠CAF与DE交于点G求证GE＝GF．
如图是重庆某轻轨站入口扶梯建设示意图．起初工程师计划修建一段坡度为32的扶梯AB扶梯总长为15米．但这样坡度太陡扶梯太长容易引发安全事故．工程师修改方案修建ACDE两段扶梯．并减缓各扶梯的坡度．其中扶梯AC和平台CD形成的∠ACD为135°．从E点看D点的仰角为36.5°AC段扶梯长18米．则DE段扶梯长度约为米参考数据sin36.5°≈cos36.5°≈cos36.5°≈tan36.5°≈
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