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己知△ABC三个内角A,B,C对应的边分别为a,b,c,且2cosB(ccosA+acosC)=b. (Ⅰ)求证:A,B,C成等差数列; (Ⅱ)若b=2,求a2+c2的取值范围.
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高一下学期数学《》真题及答案
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Theyoungmanwillhavethegoodsdtomorrowsoyou'llreceivethemsoon.
Whenpeopleusewordsand短语differentfromthestandardlanguageitiscalledadialect.
BecausemostJapanesepeopledon'treallyliketheideaofhavingaroommatealotoftheseyoungpeopleenduplivingaloneincludingyoungwomen.WhileTokyoismuchsaferthanlargecitiesinmanyothercountriescrimesdohappenandcriminalsoftenconsideryoungwomenwholivealonetobeeasytargets. Tohelpaddressthisproblemandalsotoputthemindsoffemaletenants房客ateaseapartmentmanagementcompanyLeoPalace21hasdevelopedwhatitcallstheManontheCurtainsystem. Usingaprojector投影仪controlledbyasmartphoneManontheCurtainthrowsanoutlineofamanontoyourcurtainssothatwhenpeopleoutsidelookatyourwindowstherewillappeartobeaguyinsidethusmaskingthatyoulivealone.Ifyou'rewonderinghowthat'sbetterthanjustputtingacardboardcutout剪贴画byyourwindowManontheCurtainisfull﹣motionprojectingvideosofactualactorsforanextremelylifelikelook. Currentlythesystemhas12differentoptionsincludingsuchfrighteningroutinesasabodybuilderworkingoutwithdumbbellsandasportsfanswingingabaseballbataroundwhichseemslikeitcoulddoubleasafitnessvideothatyoucoulddoyourselftogetherwithyourshadowyprotector. Sinceit'dbeeasytoinferthatashortsetpatternisafakeeachvideoisroughly30minuteslongwithavarietyofmotions. Grantedsomeoftheoptionssuchasthemanvacuumingorplayingguitararen'tgoingtobeaseffectiveifawould﹣becriminaliscloseenoughtothewindowtonoticethelackofsound.Buttheimagesthemselvesareveryconvincing. 1Whichofthefollowingstatementsisright? A.Tokyoisacityofnocrime. B.LadiesareeasilyrobbedinJapan. C.Onlyyoungladiesenjoybeingalone. D.LeoPalace21worksonapartmentaffairs. 2WhatistrueabouttheManontheCurtainSystem? A.It'sapopularmobileAPP. B.Itcanfindcriminalbehaviors. C.Itplaysavividcartoonfortenants. D.It'smainlydesignedforfemalelivingalone. 3WhatdoweknowaboutParagraph3? A.Cutoutsarebetterthanthesystem. B.Cutoutsaren'teffectiveatall. C.Peoplemaythinkyouarenotalone. D.Youcanwatchvideoswhenalone. 4Whatcanweinferaboutthesystemfromthelastparagraph? A.Itmaybeimprovedbythecompany. B.Itsvideowilllastlonger. C.Itsmotionsaren'tvividenough. D.Itwon'tbewellreceived.
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