1985-ajhsme_学科竞赛_初中教育_教育专区

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1、Problem13x57x9x119x113x5x7(A)l(B)0(C)49(D)扫(E)50SolutionProblem290+91+92+93+94+95+96+97+98+99=(A)845(B)945(C)1005(D)1025(E)1045SolutionProblem3io75x104=(A).002(B).2(C)20(D)200(E)2000SolutionProblem4TheareaofpolygonABCDEF,insquareunits,is(A)24(B)30(C)4

2、6(D)66(E)74A6B5E9FSolutionThebargraphshowsthegradesinamathematicsclassforthelastgradingperiod.IfA,B,C,andDaresatisfactorygrades,whatfractionofthegradesshowninthegrapharesatisfactory?12349(A)3(B)3(C)n(D)-(E)応SolutionProblem6Areamofpapercontaining500she

3、etsis5cmthick.Approximatelyhowmanysheetsofthistypeofpaperwouldtherebeinastack7.5cmhigh?(A)250(B)550(C)667(D)750(E)1250SolutionProblem7A”stair-step”figureismadeofalternatingblackandwhitesquaresineachrow.Rows1through4areshown.Allrowsbeginandendwithawhit

4、esquare・Thenumberofblacksquaresinthe37throwis(A)34(B)35(C)36(D)37(E)38SolutionProblem8o242—3a,4g,—,a，］Ifa=—2,thelargestnumberinthesetais24(A)一3a(B)4a(C)—(D)a2(E)1SolutionProblem9Theproductofthe9factors2/V3八4/I10/（D）薯（E）罟（嗚(A)-4(B)ik710k79SolutionProbl

5、em1011Thefractionhalfwaybetween5and3(onthenumberline)is()-■53124538(A)&(B)Ti(C)盲(D)顽㈣肓SolutionProblem11Apieceofpapercontainingsixjoinedsquareslabeledasshowninthediagramisfoldedalongtheedgesofthesquarestoformacube.Thelabelofthefaceoppositethefacelabele

6、dXisYuVWXz(A)Z(B)U(C)V(D)W(E)YSolutionProblem12Asquareandatrianglehaveequalperimeters.Thelengthsofthethreesidesofthetriangleare6.2cm,8.3cmand9.5cm.Theareaofthesquareis(A)24cm2(B)36cm2(C)48cm2(D)64cm2(E)144cm2SolutionProblem13Ifyouwalkfor45minutesatara

7、teof4mphanc

8、thenrunfor30minutesatarateof10mph〉howmanymileswillyouhavegoneattheendofonehourand15minutes?(A)3.5miles(B)8miles(C)9miles(D)25+miles(E)480milesuSolutionProblem14Thedifferencebetweena6.5%salestaxanda6%salestaxonanitempricedat$20beforetaxis(A

9、)$.01(A)$.10(B)$.50(C)$i(E)$10SolutionProblem15Howmanywholenumbersbetween100and400containthedigit2?(A)100(B)120(C)138(D)140(E)148SolutionProblem16TheratioofboystogirlsinMr.Brown'smathclassis2:3.Ifthereare30studentsintheclass,howmanymoregirlsth