SAT数学试题及答案.docx

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SAT数学试题及答案.docx

SAT数学试题及答案

 SAT数学题分成了选择题和计算题,相对于SAT数学选择题,答案还有一些提示的作用,SAT数学计算题就需要大家自己进行解答了。

下面为大家推荐的这道SAT数学计算题是非常典型的代数方程类的题目,大家一起来看看吧。

  

   

  Whatvalueof 

satisfiesbothoftheequationsabove?

  Thecorrectansweris1/2or.5

  Explanation

  Difficulty:

Medium 

 

  Since 

thevalueof 

iseither 

or 

.

 

    

       

       

 

  OR

       

       

       

 Thetwovaluesof 

thatsatisfythefirstequationare 

and 

.

  Since 

thevalueof 

iseither 

or 

.

 

  

       

      

  OR

       

       

 

       

  Thetwovaluesof 

thatsatisfythesecondequationare 

and 

.

  Youareaskedtofindthevalueof 

thatsatisfiesbothequations.Thatvalueis 

.Theanswercanbeenteredinthegridas 

or 

.

下面是两道SAT数学练习题,都是选择题,后面附有答案及其解析。

SAT数学练习题可以让大家更快更好的了解SAT数学考试的出题方式以及应对方式。

下面是详细内容,我们一起来看一下这些SAT数学练习题的吧。

  1、ConeAhasvolume24.Whenitsradiusandheightaremultipliedbythesamefactor,thecone’ssurfaceareadoubles.WhatisConeA’snewvolume?

  (A)

  (B)48

  (C)

  (D)96

  (E)Notenoughinformationtotell

  2、A

rectanglestandssothatits6inchsideliesflatagainsttheground.Iftherectangleisrotatedaroundtheaxisofoneofitstwo4inchsides,whatisthevolumeoftheresultingcylinder?

  (A)24Ï€

  (B)36Ï€

  (C)64Ï€

  (D)96Ï€

  (D)144Ï€

  Answers

  1、C

  Theformulaforacone’ssurfaceareaisπr2+πrl.Acone’svolumeis1/3πr2h.Soifthedimensionsofaconearemultipliedbythesamefactor,a,

  thenitssurfaceareamultipliesbythesquareofthatfactor.Ifthedimensionsofaconearemultipliedbythesamefactor,thevolumebecomesmultipliedbythecubeofthatfactor:

  Ingeneral,forsolids,ifeachdimensionofaconeismultipliedbythesamefactor,thesolid’ssurfaceareaismultipliedbythesquareofthatfactor,anditsvolumeincreasesbythecubeofthatfactor.IfthesurfaceareaofConeAdoubles,itsdimensionsaremultipliedbyafactorof

Thus,thecone’svolumeismultipliedbyafactorof

ConeA’snewvolumeis

 

  2、E

  Iftherectangleisrotatedaboutasideoflength4,thentheheightofthecylinderwillbe4andtheradiuswillbe6.

  Onceyouvisualizethecylinder,youcanpluginthevaluesforthevolumeofacylinder:

一道SAT数学题(抛物线)

天道留学  时间:

2011-08-26

点击:

26次

  下面是一道关于抛物线的SAT数学题及其解法的内容,非常详细。

SAT题中,抛物线是必考的一类,虽然中学课程都有所涉及,还是相对比较抽象,尤其是在理解SAT数学题的表达方式上。

下面我们来看看这道关于抛物线的SAT数学题吧。

      ReadthefollowingSATtestquestionandthenclickonabuttontoselectyouranswer.

  

 

  Thequadraticfunction

isgraphedinthe

-planeabove.If 

forallvaluesof

whichofthefollowingcouldbethecoordinatesofpoint

?

  AnswerChoices

  (A)

 

  (B)

 

  (C)

 

  (D)

 

  (E)

 

  ThecorrectanswerisC

  Explanation

  Thefactthat

forallvaluesof

meansthatthepoint

isthemaximumofthequadraticfunction

so

mustbethevertexoftheparabola.Theparabolaintersectsthe

-axisatthepoints

and

so

mustbehalfwaybetween

and

.Therefore,

.Ofthechoices,theonlyonewith

-coordinateequalto

is

.Therefore,

couldbethecoordinatesofpoint

.

1.Whatisthelengthofthelinesegmentinthex-yplanewithendpointsat(-2,-2)and(2,3)?

  A.3

  B.√31

  C.√41

  D.7

  E.9

  CorrectAnswer:

C

  解析:

  Sketchadiagramandcalculatethedistance(hypotenuseofarighttriangle)usingPythagorastheorem.

  

 

  Verticalheightoftriangle=5;horizontalside=4;hypotenuse=√(25+16)=√41

  2.nisanintegerchosenatrandomfromtheset{5,7,9,11}

  pischosenatrandomfromtheset{2,6,10,14,18}

  Whatistheprobabilitythatn+p=23?

  A.0.1

  B.0.2

  C.0.25

  D.0.3

  E.0.4

  CorrectAnswer:

A

  解析:

  Eachoftheintegersinthefirstsetcouldbecombinedwithanyfromthesecondset,givingatotalof4x5=20possiblepairs.Ofthesethecombinationsthatcouldgiveasumof23are(5+18),and(9+14).Thismeansthattheprobabilityofgettingasumof23is2/20=1/10

  3.Adressonsaleinashopismarkedat$D.Duringthediscountsaleitspriceisreducedby15%.Staffareallowedafurther10%reductiononthediscountedprice.IfastaffmemberbuysthedresswhatwillshehavetopayintermsofD?

  A.0.75D

  B.0.76D

  C.0.765D

  D.0.775D

  E.0.805D

  CorrectAnswer:

C

  解析:

  Ifthepriceisreducedby15%,thenthenewpricewillbe0.85D.Ifthisnewpriceisfurtherreducedby10%,thediscountedpricewillbe0.9x0.85D=0.765D

  

 

  4.Allthedotsinthearrayare2unitsapartverticallyandhorizontally.Whatisthelengthofthelongestlinesegmentthatcanbedrawnjoininganytwopointsinthearraywithoutpassingthroughanyotherpoint?

  A.2

  B.2√2

  C.3

  D.√10

  E.√20

  CorrectAnswer:

E

  解析:

  Thelongestlinesegmentthatcanbedrawnwithoutpassingthroughanydotsotherthanthoseatthebeginningandendofthesegment,suchalinecouldgofromthemiddledotinthetoprowtoeitherthebottomleftorrightdot.Inanycasethesegmentwillbethehypotenuseofarighttrianglewithsides2and4.UsingPythagorastheoremthehypotenusewillbe√(2²+4²)=√20

  

 

  5.IftheradiusofthecirclewithcentreOis7andthemeasureofangleAOBis100,whatisthebestapproximationtothelengthofarcAB?

  A.9

  B.10

  C.11

  D.12

  E.13

  CorrectAnswer:

D

  解析:

  Iftheradiusis7,thecircumference=14π.Thelengthofthearcis100/360ofthecircumference.Takingπas22/7weget.(100x14x22)/(360x7)whichreducesto440/36=12.22(i.e.approx.12)

1、AtCentralHighSchool,themathclubhas 

membersandthechessclubhas

members.Ifatotalof 

studentsbelongtoonlyoneofthetwoclubs,howmanystudentsbelongtobothclubs?

 

  AnswerChoices

  (A) 

 

  (B) 

 

  (C) 

    (D) 

  (E) 

  ThecorrectanswerisC

  Explanation

  Let 

standforthenumberofstudentswhobelongtobothclubs.The 

membersofthemathclubcanbebrokendownintotwogroups:

thosewhoareinbothclubs(thereare 

studentsinthiscategory)andthosewhoareinthemathclubonly(thereare 

studentsinthiscategory).

  The 

membersofthechessclubcanalsobebrokendownintotwogroups:

 

studentswhoareinbothclubsand 

studentswhoareinthechessclubonly.

   Sinceatotalof 

studentsbelongtoonlyoneofthetwoclubs,youknowthat 

.Solvingthisequationgives 

so 

studentsbelongtobothclubs。

  2、If 

isdivisibleby 

 

and 

whichofthefollowingisalsodivisiblebythesenumbers?

   AnswerChoices

   (A) 

   (B) 

   (C) 

   (D) 

   (E) 

   ThecorrectanswerisD

  Explanation

  Since 

isdivisibleby 

 

and 

 

mustbeamultipleof 

as 

istheleastcommonmultipleof 

 

and 

.Somemultiplesof 

are 

 

 

 

and 

.

  Ifyouaddtwomultiplesof 

thesumwillalsobeamultipleof 

.Forexample, 

and 

aremultiplesof 

andtheirsum, 

isalsoamultipleof 

.

   Ifyouaddamultipleof 

toanumberthatisnotamultipleof 

thesumwillnotbeamultipleof 

.Forexample, 

isamultipleof 

and 

isnot.Theirsum, 

isnotamultipleof 

.

   Thequestionaskswhichanswerchoiceisdivisibleby 

 

and 

;thatis,whichanswerchoiceisamultipleof 

.Alltheanswerchoicesareintheformof"

plusanumber."Onlychoice(D), 

has 

addedtoamultipleof 

.Thesumof

and 

isalsoamultipleof

sothecorrectanswerischoice(D).

  3、Inan 

solutionofwaterandalcohol,theratiobymassofwatertoalcoholis 

to

.If 

gramsofasolutionconsistingof 

gramswaterforeachgramofalcoholisaddedtothe 

solution,whatfractionbymassofthenewsolutionisalcohol?

   AnswerChoices

  (A) 

 

  (B) 

 

  (C) 

 

  (D) 

 

  (E) 

 

  ThecorrectanswerisB

  Explanation

  Tofindwhatfractionbymassofthenewsolutionisalcohol,youcanfindhowmanygramsofalcoholareinthefinalsolutionof 

grams.Sincethe 

solutionis 

partalcoholto 

partswater,itis 

alcohol.Soitcontains 

gramsofalcohol.Similarly,the 

solutionis

alcoholbymass,soitcontains 

gramsofalcohol.Thus,thefinal20-gramsolutioncontains 

gramsofalcohol,so 

or 

ofitisalcohol.

 1.Ofthefollowing,whichisgreaterthan?

  A.2/5

  B.4/7

  C.4/9

  D.5/11

  E.6/13

  2.Ifanobjecttravelsatfivefeetpersecond,howmanyfeetdoesittravelinonehour?

  A.30

  B.300

  C.720

  D.1800

  E.18000

  3.Whatistheaverage(arithmeticmean)ofallthemultiplesoftenfrom10to190inclusive?

  A.90

  B.95

  C.100

  D.105

  E.110

  4.Acubicalblockofmetalweighs6pounds.Howmuchwillanothercubeofthesamemetalweighifitssidesaretwiceaslong?

  A.48

  B.32

  C.24

  D.18

  E.12

  5.Inaclassof78students41aretakingFrench,22aretakingGermanand9studentsaretakingbothFrenchandGerman.Howmanystudentsarenotenrolledineithercourse?

  A.6

  B.15

  C.24

  D.33

  E.54

  1.CorrectAnswer:

B

  Explanation:

  Onewaytodealwithfractionsistoconvertthemalltodecimals.(Usingyourcalculator,dividethenumeratorbythedenominator).

  Inthiscaseallyouwouldneedtodoistoseewhichisgreaterthan0.5.

  Otherwisetoseewhichisgreaterthan?

doublethenumeratorandseeiftheresultisgreaterthanthedenominator.InB,thecorrectanswer,doublingthenumeratorgivesus8,whichisbiggerthan7.

  2.CorrectAnswer:

E

  Explanation:

  Ifanobjecttravelsat5feetperseconditcovers5x60feetinoneminute,and5x60x60feetinonehour.Answer=18000(E)

  3.CorrectAnswer:

C

  Explanation:

  Youcouldaddupallthemultiplesof10(10+

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