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△ABC中,角A、B、C所对的边长分别为a、b、c,且a•cosB=b•sinA. (1)求角B的大小; (2)若b=,ac=2,求a+c的值.
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高二上学期数学《》真题及答案
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假如你叫王平根据图表提示给你的加拿大网友Smith写一封信介绍你的寒假生活共20天可根据自己的实际情况添加细节. 注意1.词数100左右2.开头已经给出不计入总词数. DearSmith Howareyou?Howtimeflies!NowthewintervacationwasoverandIhavecomebacktoschoolagain. Yours WangPing
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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