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数列{an}满足a1=﹣1,a2=3,an=an+1﹣an+2,则a7= .
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高二上学期数学《》真题及答案
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=2*$A$1
=2*$A1
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要在Excel工作表区域A1A10输入等比数列24816可以在A1单元输入数字2在A2单元输入公式然
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要在Excel工作表区域A1:A10输人等比数列24816可以在A1单元输入数字2在A2单元输入公式
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设实数q满足|q|
已知等差数列{an}满足a1=2且a1a2a5成等比数列.求数列{an}的通项公式.
已知数列{an}中a1=3a2=6an+2=an+1-an则a2009=
6
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3
-3
设数列{an}满足a1=1a2=2an+2=n≥1n∈N*令1求证数列是常数列2求证当n≥2时3求a
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A1
A1A3
A1A3A4
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要在Excel工作表区域A1A10输入等比数列24816可以在A1单元输入数字2在A2单元输入公式然
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在公差为d的等差数列{an}中已知a1=10且a12a2+25a3成等比数列.1求dan;2若d
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以下正确的赋值语句是
A1,A2,A3=10
SET 10 TO A1,A2,A3
LOCAL 10 TO A1,A2,A3
STORE 10 TO A1,A2,A3
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TeenagersinAmericaknowthatthey'llpossiblyneedtechnicalskillstofindgoodjobsbutanewsurveyrevealsthatinterestintechnology﹣relatedcareersmaybedecreasing. Thepercentageofboysaged13to17whoareinterestedinsciencetechnologyengineeringandmath﹣﹣﹣orSTEM﹣﹣﹣careersdroppedfrom36percentin2017to24percentthisyearaccordingtoasurveybyJuniorAchievementUSA.TheamountofgirlsinterestedinSTEMcareersstayedunchangedatIIpercent. Butthe1000surveyparticipantsstillnamedtechnologyasoneoftwokeyskillsthatwillbenecessarytopreparethemfortheirfuturecareers. Kidsdon'tunderstandhowtechnologycanbeappliedtocareersinadditiontocomputersandmayberoboticssaidTammeraL.HolmespresidentofaviationconsultingfirmAeroStarConsulting航空资询公司.That'salltheyknowsotheycan'treallytranslatethatinteresttocareerpathways. WhenHolmeswasinhighschoolhermomsenthertoaneventthatfeatured以…为专题thepilotsfromWorldWarII.Oneofthepilotstookherforarideandlethertakethewheel.immediatelythatwasthecareerforme.shesaid. Womenremainoutnumbered超过bymeninfieldsliketechnology.ForpeopleworkingtoincreasethenumberofwomenintheseareasthelackofgrowthingirlsinterestinSTEMcareersisconcerning. TeenagegirlsaremoreinterestedthantheirmaleclassmatesinrunningaftercareersinwhichtheycanhelpotherssaidEdGrocholskifromJuniorAchievement.Evenwithalltheprogramsaimedatincreasinggirls'interestinSTEMIdon'tthinkwereallytalkthatmuchabouthowweimprovepeople'slivesthroughSTEMGrocholskisaid. SocietyneedstodobetteratmakingthoseconnectionsforkidssaidKatherineLathamfounderofanengineeringfirm.Sheusedcivilengineeringasanexampleofacareerthatwillcontinuetobeimportant. Howeverthefactthatstudentsknowtheywillneedtechskillsintheirfuturecareersisencouraging. Thesecondskilltheysaidtheyneedisrelationship﹣building. That'sgoingtobethenewtypeofengineersLathamsaid. 1Whatisthepassagemainlyabout? A.Somesuccessfulofkidssearchingtechcareers. B.Reasonsbehindteenagersdecreasinginterestintechcareers. C.ThedifferenceinchoiceofjobsbetweenboysandgirlsinAmerica. D.Thepopularityoftechcareersamongkidsanditsreasons. 2Whatisthereasonbehindkid'slosinginterestintechcareers? A.Theyseetechcareersasboring. B.Theyfindtechskillslessimportantthanbefore. C.Theydon'tthinktechcareerscanbringrewards D.Theycan'tconnecttheirtechinterestwithfuturecareers. 3WhatcanwelearnfromGrocholski'swords? A.STEMcareershavenothingtodowithpeople'slives. B.TeenagegirlsareinterestedinrunningafterSTEMcareers. C.TherelationshipbetweenSTEMcareersandtheimprovementofpeople'slivesisn'texplainedenough. D.Teenagersdon'tknowhowtoimprovepeople'slivesthroughSTEM. 4WhatarousedHolmes'interestinhercareer? A.Asummercampforpilots. B.Herparents'wishforher. C.Areportaboutthelifeofpilots D.Herflightexperiencewithapilot. 5AccordingtoGrocholskiteenagegirlsaremoreinterestedincareersthat. A.canmakethemlookattractive B.canmakefriendswithotherpeople C.canmakepeople'slivesbetter D.aredifferentfromthoseoftheirparents
Atimelineofairdisasters March112019AnEthiopianAirlinesflightBoeing737fromAddisAbabatoNairobiKenyacrashedsoonaftertakingoffonSundaymorningkillingall157peopleonboardincluding8Chinese. May182018AplanerentedbylocalcompanyCubanadeAviacionfromtheMexicanairlineDamojhcrashedshortlyaftertakingofffromHavana'sJoseMartiInternationalAirport.Atotalof114peoplewereonboardamongwhomtwowomensurvived. November52017aCzech﹣builtLet410belongingtoKhabarovskAviacrashedonlandingat NelkanintheRussianFarEastwiththelossofsixlives.Afour﹣year﹣oldgirlwastheonlysurvivor. May182016EgyptAirFlightMS804CrashesintoMediterraneanSeacausing57deathsincludingonechildandtwobabies. March242015GermanwingsFlight9525with150passengersandcrewcrashedintheFrench AlpsonthewayfromBarcelonatotheGermancityofDuesseldorf.Allonboardwerekilled. March82014MalaysiaAirlinesFlight370disappearedlessthananhouraftertakeoff.TheplanewastravelingfromKualaLumpurInternationalAirporttoBeijing.ItvanishedovertheIndianOceanwith 239passengersandcrewmembersonboard. November172013TatarstanAirlinesBoeing737crashesonlandinginKazanRussiakillingall 50peopleonboard. April202012ABhojaAirBoeing737crashesonitsapproachtothemainairportinthePakistanicapitalIslamabadkillingall121passengersandsixcrew. January92011AnIranAirBoeing727breaksintopiecesnearthecityofOrumiyehkilling72onthesceneandinjuring33fiveofwhomdiedlaterinhospital.Thepilotshadreportedatechnicalfailurebeforetryingtoland. May222010AnAirIndiaExpressBoeing737overshottherunwaywhilelandingatahilltopairportandcrashedintoavalleyburstingintoflamesandleaving159deathsand7injuries. 1Whichyearinthelistwasthesafestyearforairpassengers? A.2017. B.2015. C.2013. D.2011. 2Inthislistwhichofthefollowinginvolvedthemostcrashes? A.Takingoff. B.Landing. C.Boeing737. D.ThemonthofMarch. 3Howmanypeopleescapedfrombeingkilledinthe10airdisasterslistedabove? A.3. B.36. C.38. D.43.
寒暑假期间很多高中学生选择短期出国游学但是也有一部分学生认为这没有意义.请根据以下提示用英语写一篇150词左右的短文并谈谈你自己的看法. 【写作要求】 1.对所给要点逐一陈述适当发挥不要简单翻译 2.作文中不是提及有关考生个人身份的任何信息如校名人名等 3.开关已给出不计入总词数. 4.参考词汇出国游学overseasstudytours 【评分标准】 内容完整语言规范语篇连贯词数适当. Withtheimprovementoflivingstandardsoverseasstudytoursaregainingitspopularitywithsomehighschoolstudents.
Thefutureofourcitythecreativityandinnovationofyoungpeople. A.takesin B.liesin C.resultsin D.bringsin
Theboyaswellashisparentsarefondofplayingcomputergames.
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