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《2012美国数学竞赛amc8》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、2012AMC8ProblemsProblem1Rachelleuses poundsofmeattomake hamburgersforherfamily.Howmanypoundsofmeatdoessheneedtomake hamburgersforaneighborhoodpicnic?SolutionProblem2InthecountryofEastWestmore,statisticiansestimatethereisababybornevery hoursandadeathevery
2、day.Tothenearesthundred,howmanypeopleareaddedtothepopulationofEastWestmoreeachyear?SolutionProblem3OnFebruary13 listedthelengthofdaylightas10hoursand24minutes,thesunrisewas ,andthesunsetas .Thelengthofdaylightandsunrisewerecorrect,butthesunsetwaswrong.When
3、didthesunreallyset?SolutionProblem4Peter'sfamilyordereda12-slicepizzafordinner.PeterateonesliceandsharedanothersliceequallywithhisbrotherPaul.WhatfractionofthepizzadidPetereat?Solution华数教育专业中小学奥数辅导，专注美国数学竞赛AMC8、10、12，美国数学邀请赛AIME，美国普林斯顿数学竞赛PUMAC，13524602295，
4、Problem5Inthediagram,allanglesarerightanglesandthelengthsofthesidesaregivenincentimeters.Notethediagramisnotdrawntoscale.Whatis, incentimeters?SolutionProblem6Arectangularphotographisplacedinaframethatformsabordertwoincheswideonallsidesofthephotograph.Thep
5、hotographmeasures8incheshighand10incheswide.Whatistheareaoftheborder,insquareinches?SolutionProblem7Isabellamusttakefour100-pointtestsinhermathclass.Hergoalistoachieveanaveragegradeof95onthetests.Herfirsttwotestscoreswere97and91.Afterseeingherscoreonthethir
6、dtest,sherealizedshecanstillreachhergoal.Whatisthelowestpossiblescoreshecouldhavemadeonthethirdtest?Solution华数教育专业中小学奥数辅导，专注美国数学竞赛AMC8、10、12，美国数学邀请赛AIME，美国普林斯顿数学竞赛PUMAC，13524602295，Problem8Ashopadvertiseseverythingis"halfpriceintoday'ssale."Inaddition,acoup
7、ongivesa20%discountonsaleprices.Usingthecoupon,thepricetodayrepresentswhatpercentageofftheoriginalprice?SolutionProblem9TheFortWorthZoohasanumberoftwo-leggedbirdsandanumberoffour-leggedmammals.Ononevisittothezoo,Margiecounted200headsand522legs.Howmanyofthea
8、nimalsthatMargiecountedweretwo-leggedbirds?SolutionProblem10Howmany4-digitnumbersgreaterthan1000aretherethatusethefourdigitsof2012?SolutionProblem11Themean,median,anduniquemodeofthepositiveintegers3,4,
