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ID:35311844
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页数:5页
时间:2019-03-23
《新sat数学练习》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、新SAT数学练习1、If(x−1k)/3=kandk=3,whatisthevalueofx?A)2B)4C)9D)10正确答案:D解析:2、OnSaturdayafternoon,Armandsentmtextmessageseachhourfor5hours,andTyronesentptextmessageseachhourfor4hours.WhichofthefollowingrepresentsthetotalnumberofmessagessentbyArmandandTyroneonSaturdayafternoon?A)9mpB)20mpC)5m+
2、4pD)4m+5p正确答案:C解析:ThetotalnumberofmessagessentbyArmandisthe5hourshespenttextingmultipliedbyhisrateoftexting:mtexts/hour×5hours=5mtexts.Similarly,thetotalnumberofmessagessentbyTyroneisthe4hourshespenttextingmultipliedbyhisrateoftexting:ptexts/hour×4hours=4ptexts.Thetotalnumberofmessages
3、sentbyArmandandTyroneisthesumofthetotalnumberofmessagessentbyArmandandthetotalnumberofmessagessentbyTyrone:5m+4p.ChoiceAisincorrectandarisesfromaddingthecoefficientsandmultiplyingthevariablesof5mand4p.ChoiceBisincorrectandistheresultofmultiplying5mand4p.ThetotalnumberofmessagessentbyAr
4、mandandTyroneshouldbethesumof5mand4p,nottheproductoftheseterms.ChoiceDisincorrectbecauseitmultipliesArmand’snumberofhoursspenttextingbyTyrone’srateoftexting,andviceversa.Thismix-upresultsinanexpressionthatdoesnotequalthetotalnumberofmessagessentbyArmandandTyrone.3、Kathyisarepairtechnic
5、ianforaphonecompany.Eachweek,shereceivesabatchofphonesthatneedrepairs.ThenumberofphonesthatshehaslefttofixattheendofeachdaycanbeestimatedwiththeequationP=108−23d,wherePisthenumberofphonesleftanddisthenumberofdaysshehasworkedthatweek.Whatisthemeaningofthevalue108inthisequation?A)Kathywi
6、llcompletetherepairswithin108days.B)Kathystartseachweekwith108phonestofix.C)Kathyrepairsphonesatarateof108perhour.D)Kathyrepairsphonesatarateof108perday.正确答案:B解析:4/5/6道题的答案分别是C、A、B解析:这三道题都是考察计算能力,认真算相信大家都能计算出来的。7、b=2.35+0.25xc=1.75+0.40xIntheequationsabove,bandcrepresentthepriceperpoun
7、d,indollars,ofbeefandchicken,respectively,xweeksafterJuly1duringlastsummer.Whatwasthepriceperpoundofbeefwhenitwasequaltothepriceperpoundofchicken?A)$2.60B)$2.85C)$2.95D)$3.35正确答案:D解析:8/9正确答案分别是B、D解析:8、9、
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