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在△ABC中,边a,b,c分别是角A,B,C的对边,且满足bcosC=(3a﹣c)cosB,若=4,则ac的值为( )
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高二下学期数学《》真题及答案
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在△ABC中角A.B.C.对边分别是abc且满足.Ⅰ求角A.的大小Ⅱ若△ABC的面积为求bc.
在D.ABC中已知内角A.B.C.的对边分别是且满足I.求角A.的大小II当D.ABC为锐角三角形时
在△ABC中内角
,
的对边分别是a,b,且A.=30°,a=2
,b=4,那么满足条件的△ABC( ) A.有一个解 B.有两个解
无解
不能确定
在ABC中角A.BC的对边分别为bc且满足1求角A.2若且求边bc
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在△ABC中abc分别是角A.B.C.的对边且a=2b=3cosC.=则其外接圆半径为_______
△ABC中角A.BC的对边分别是abc若c=2asinCbc=4则△ABC的面积是.
在△ABC中角A.B.C.的对边分别是ab.c且则B.的大小为.
在△ABC中角A.B.C.的对边分别为abc且满足asinA.-sinB.+bsinB.=csinC
在△ABC中角A.B.C.的对边分别为abc且满足2a-ccosB=bcosC则角B.的值为.
在△ABC中abc分别是角A.B.C.的对边且a=2b=3cosC.=则其外接圆半径为_______
已知函数fx=Ⅰ求函数fx单调递增区间Ⅱ在△ABC中角ABC的对边分别是abc且满足2a﹣ccosB
已知函数.Ⅰ求函数fx的最小正周期Ⅱ在△ABC中角A.B.C.的对边分别是abc且满足求fB.的取值
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在△ABC中abc分别是角A.B.C.的对边且.I.求角B.的大小II若求△ABC的面积.
在△ABC中abc分别是角A.B.C.的对边△ABC的周长为+2且sinA+sinB=sinC.1求
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30分IwassurprisedwhenIreceivedashortmessagefrommyfatherwishingmeahappybirthday. Ihad1tohearfrommymothermygrandmotherandmyotherrelatives2neverfrommyfather.Lyinginbed3ofmyfatherfloodedback. WhenIwasalittleboyIregardedmyfatherasan4abletodoanything.5thingsslowlybeganto6.ThemoreIlearnedthemoreIdoubtedwhathesaid.ThegapbetweenusgrewandatlastIdidn't7likecommunicatingwithhim. Myfatherinmymindhadno8intalkingwithme.Dinnerwastheonlytimeweweretogether.HehadnotimetowatchTVwithme.Hewouldtellmetoaskmymother9Ineededsomething.Heevenrefusedtoanswermy10whenIphonedfromschool.I11thechanges.Ithoughtthatperhapsmyfathernolonger12meanymore. OvertimehoweverIbegantowonderwhethermy13wasright.OnedaymymothertoldmethateachtimeIcalledFatherwas14listeningbesideher.SuddenlyIhatedmyselfformy15behaviortowardhim. Iplannedthousandsoftimesto16myfather.IntheendhoweverIwasalwaystooembarrassedaboutwhatIhaddone. ButthatSaturdayIwasso17byhisshortmessage.Irealizedthenthatmyfather'sloveformehadneverdisappeared.Idecidedtosenda18:Thankyoumydearfather. TwodayslaterwhenIreturnedhomemymothertoldmethatmyfatherhadbeenso19whenhereceivedmyreply.Shesaidhehad20frommorningtillnight.AtthatmomentIfelttrulyhappy. 1A.expected B.intended C.planned D.wanted 2A.and B.so C.but D.or 3A.opinions B.memories C.thoughts D.responses 4A.angel B.teacher C.hero D.friend 5A.However B.Otherwise C.Therefore D.Besides 6A.improve B.change C.develop D.appear 7A.still B.ever C.yet D.even 8A.interest B.time C.chance D.courage 9A.incase B.if C.evenif D.after 10A.letters B.e﹣mails C.questions D.calls 11A.gotfondof B.gottiredof C.gotfamiliarwith D.gotaccustomedto 12A.helped B.supported C.loved D.missed 13A.behavior B.attitude C.manner D.action 14A.ever B.always C.seldom D.never 15A.casual B.rude C.cold D.cruel 16A.apologizeto B.writeto C.talkwith D.consultwith 17A.surprised B.confused C.touched D.pleased 18A.message B.card C.gift D.reply 19A.upset B.happy C.sad D.nervous 20A.waited B.signed C.hesitated D.smiled
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