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二次函数y=ax²+2x-1与直线y=2x-3交于点P(1,b).(1)求出此二次函数的解析式;(2)求此二次函数的顶点坐标,并指出x取何值时,该函数的y随x的增大而减小.
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Manypeopleoftenmeetsuchdifficultsituation.It'sthattheydon'tknowthewayinnewplacesandtheyaretooshytoaskpeopleabouttheway.1 FirstlywemustknowsomeimportantandusefulexpressionssuchasCouldyouplease…ExcusemeandThanksalot.ForexamplewhenwewanttoaskstrangersaboutthewaywemustsayExcusemeatfirst.2NextCouldyouplease…isoftenusedwhileaskingforthedirection.3It'salsopolitetoshakehandswiththestrangers. Secondlyweoftenneedtotakesomeusefulthingswithus.Theyusuallyincludepensspecialmapscamerasandsoon.4Wecanwritedownthekeywordsabouttheplaceandthenwecanshowthemtothestrangerswhowewanttoaskforhelp.Ofcoursethecamerascanhelpusfindourcorrectway.5Thenwecanshowthepicturesaboutittothestrangerswhenaskingfordirections. Allaboveispoliteorusefulwaystoaskaboutthecorrectwayorplace. 根据材料内容从下面五个选项中选出能填入文中空缺处的最佳选项使短文意思通顺内容完整. A.Sometimesapencanhelpusgettotherightplace. B.IntheUSApeoplealsouseitinmanydifferentsituations. C.Herearesometipsonhowtoaskaboutthewaypolitely. D.AfterweknowhowtogettothefinalplaceweshouldsayThankstoothers. E.Beforewegotoastrangeplacewecantakesomephotosaboutit. 1. 2. 3. 4. 5.
﹣Doyouhavetoplaythemusicsoloud?I'vegotatesttomorrow! ﹣SorryIyoucouldhearthat. A.don'tknow B.won'tknow C.didn'tknow D.haven'tknown
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