新sat数学练习

《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、