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《2009AMC8试题(英文)》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。
1、Problem1Bridgetboughtabagofapplesatthegrocerystore.ShegavehalfoftheapplestoAnn.ThenshegaveCassie3apples,keeping4applesforherself.HowmanyapplesdidBridgetbuy?Problem2Onaverage,forevery4sportscarssoldatthelocaldealership,7sedansaresold.Thedealershippredictsthatit
2、willsell28sportscarsnextmonth.Howmanysedansdoesitexpecttosell?Problem3ThegraphshowstheconstantrateatwhichSuzannaridesherbike.Ifsheridesatotalofahalfanhouratthesamespeed,howmanymileswouldshehaveridden?Problem4Thefivepiecesshownbelowcanbearrangedtoformfourofthef
3、ivefiguresshowninthechoices.Whichfigurecannotbeformed?Problem5Asequenceofnumbersstartswith,,and.Thefourthnumberofthesequenceisthesumofthepreviousthreenumbersinthesequence:.Inthesameway,everynumberafterthefourthisthesumofthepreviousthreenumbers.Whatistheeighthn
4、umberinthesequence?Problem6Steve'semptyswimmingpoolwillholdgallonsofwaterwhenfull.Itwillbefilledbyhoses,eachofwhichsuppliesgallonsofwaterperminute.HowmanyhourswillittaketofillSteve'spool?Problem7ThetriangularplotofACDliesbetweenAspenRoad,BrownRoadandarailroad.
5、MainStreetrunseastandwest,andtherailroadrunsnorthandsouth.Thenumbersinthediagramindicatedistancesinmiles.Thewidthoftherailroadtrackcanbeignored.HowmanysquaremilesareintheplotoflandACD?Problem8Thelengthofarectangleisincreasedby10%andthewidthisdecreasedby10%.Wha
6、tpercentoftheoldareaisthenewarea?Problem9Constructasquareononesideofanequilateraltriangle.Oneonnon-adjacentsideofthesquare,constructaregularpentagon,asshown.Oneanon-adjacentsideofthepentagon,constructahexagon.Continuetoconstructregularpolygonsinthesameway,unti
7、lyouconstructanoctagon.Howmanysidesdoestheresultingpolygonhave?Problem10Onacheckerboardcomposedof64unitsquares,whatistheprobabilitythatarandomlychosenunitsquaredoesnottouchtheouteredgeoftheboard?Problem11TheAmacoMiddleSchoolbookstoresellspencilscostingawholenu
8、mberofcents.Someseventhgraderseachboughtapencil,payingatotalof.Someofthesixthgraderseachboughtapencil,andtheypaidatotalof.Howmanymoresixthgradersthanseventhgradersboughtapencil?Pro
