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等差数列{an}满足a1=3,2a3=a6. (1)求数列{an}的通项公式; (2)设bn=an•3n﹣1”求数列{bn}的前n项和Sn.
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高二上学期数学《》真题及答案
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Incaseyoufeelnervousduringtheinterviewyoucanmakefullpreparations. A.inreturn B.intime C.incommon D.inadvance
Dozensof志愿者havecometohelpthosesufferingfromtheearthquakes.
Asalawyerhemustbeabletoargue逻辑地.
HowtoLiveaHappyLife Happinessiswhatweneedmostwiththeincreaseofpressureinmodemlife.1Fortunatelythisisnotthecase.Everyonehastheabilitytohangontohappinesswithhisownefforts.Thefollowingmethodsmayleadyoutolong﹣lastinghappiness. •Takeexercise.Otherthanhealthbenefitsthataretoonumeroustomentionexercisemakesyousmarterhappierimprovessleepandmakesyoufeelbetteraboutyourbody.2Keepingintouchwithnaturecanhelpyoureducestressmakeyoumorecreativeimproveyourmemoryandmayevenmakeyouabetterperson. •3Relationshipsareworthmorethanyouthink.Notfeelingsociallyconnectedcanmakeyoustupiderandkillyou.Lonelinesscanleadtoheartattackstroke中风anddiabetes肥胖症.Ontheotherhandstudieshaveshownthatthelongestlivedpeopleontheplanetallplaceastrongemphasisonsocialengagement. •ChallengeYourself.4Musiclessonsincreaseintelligence.Challengingyourbeliefsstrengthensyourmind.Increasingwillpowerjusttakesalittleefforteachdayandit'smoreresponsibleforyoursuccessthanIQ.Notgettinganeducationortakingadvantageofopportunitiesaretwoofthethingspeoplelookbackontheirlivesandregretthemost. •Laugh.Laughterhassimilareffectstophysicalexercise.Itincreasesbloodpressuretheheartrateandtherateofbreathingitalsoworksseveralgroupsofmusclesinthefacethestomachandthefeet.Itcanevenreducetheeffectofpainonthebody.Humorisagoodwaytocauselaughter.5 A.Lifeisalwaysfullofhope. B.Spendtimewithfriendsandfamily. C.Howeversometimesitseemsfarawayfromus. D.Itwouldbebetterifyoutakeexerciseinnature. E.Dosomethingkindforthepeopleyoucareabout. F.Learninganotherlanguagecankeepyourmindsharp. G.Justthinkingaboutfunnymomentsorthingscanhelpalot.
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