SAT频道为大家带来SAT数学练习题整理4一文,希望对大家SAT备考有所帮助。更多精彩尽请关注SAT频道! 1. If a2...
思润sat频道为大家带来练习题整理4一文,希望对大家SAT备考有所帮助。更多精彩尽请关注思润SAT频道!
1.Ifa2=12,thena4=
A.144
B.72
C.36
D.24
E.16
2.Ifniseven,whichofthefollowingcannotbeodd?
In+3
II3n
IIIn2-1
A.Ionly
B.IIonly
C.IIIonly
D.IandIIonly
E.I,IIandIII
3.Onesideofatrianglehaslength8andasecondsidehaslength5.Whichofthefollowingcouldbetheareaofthetriangle?
I24
II20
III5
A.Ionly
B.IIonly
C.IIIonly
D.IIandIIIonly
E.I,IIandIII
4.Acertainanimalinthezoohasconsumed39poundsoffoodinsixdays.Ifitcontinuestoeatatthesamerate,inhowmanymoredayswillitstotalconsumptionbe91pounds?
A.12
B.11
C.10
D.9
E.8
5.Aperfectcubeisanintegerwhosecuberootisaninteger.Forexample,27,64and125areperfectcubes.Ifpandqareperfectcubes,whichofthefollowingwillnotnecessarilybeaperfectcube?
A.8p
B.pq
C.pq+27
D.-p
E.(p-q)6
6.Whatisthelengthofthelinesegmentinthex-yplanewithendpointsat(-2,-2)and(2,3)?
A.3
B.√31
C.√41
D.7
E.9
7.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
8.Adressonsaleinashopismarkedat$D.Duringthediscountsaleitspriceisreducedby15%.Staffareallowedafurther10%reductiononthediscountedprice.IfastaffmemberbuysthedresswhatwillshehavetopayintermsofD?
A.0.75D
B.0.76D
C.0.765D
D.0.775D
E.0.805D
9.Allthedotsinthearrayare2unitsapartverticallyandhorizontally.Whatisthelengthofthelongestlinesegmentthatcanbedrawnjoininganytwopointsinthearraywithoutpassingthroughanyotherpoint?
A.2
B.2√2
C.3
D.√10
E.√20
10.IftheradiusofthecirclewithcentreOis7andthemeasureofangleAOBis100,whatisthebestapproximationtothelengthofarcAB?
A.9
B.10
C.11
D.12
E.13
1.CorrectAnswer:A
Explanation:
a4=a2xa2=12x12=144
2.CorrectAnswer:B
Explanation:
IncaseI,evenplusoddwillgiveodd
IncaseII,oddtimesevenwillgiveeven
IncaseIIIevensquarediseven,andevenminusoddisodd.
(Youcancheckthisbyusinganeasyevennumberlike2inplaceofn)
OnlycaseIIcannotbeodd.
3.CorrectAnswer:D
Explanation:
Themaximumareaofthetrianglewillcomewhenthegivensidesareplacedatrightangles.Ifwetake8asthebaseand5astheheightthearea=x8x5=20
Wecanaltertheanglebetweenthesidestomakeitlessormorethan90,butthiswillonlyreducethearea.(Drawitoutforyourself).Hencetheareacanbeanythinglessthanorequalto20.
4.CorrectAnswer:E
Explanation:
Foodconsumedperday=39/6.
Intheremainingdaysitwillconsume91-39pounds=52pounds
Nowdividethefoodbythedailyconsumptiontofindthenumberofdays
52/(39/6)=52x(6/39)=8
5.CorrectAnswer:C
Explanation:
Aperfectcubewillhaveprimefactorsthatareingroupsof3;forexample125hastheprimefactors5x5x5,and64x125willalsobeacubebecauseitsfactorswillbe4x4x4x5x5x5
Considertheanswerchoicesinturn.
8isthecubeof2,andpisacube,andsotheproductwillalsobeacube.
pqwillalsobeacubeasshownabove.
pqisacubeandsois27,buttheirsumneednotbeacube.Considerthecasewherep=1andq=8,thesumofpqand27willbe35whichhasfactors5x7andisnotacube.
-pwillbeacube.
Sincethedifferencebetweenpandqisraisedtothepowerof6,thisexpressionwillbeacube(withcuberoot=differencesquared).
6.CorrectAnswer:C
Explanation:
Sketchadiagramandcalculatethedistance(hypotenuseofarighttriangle)usingPythagorastheorem.
Verticalheightoftriangle=5;horizontalside=4;hypotenuse=√(25+16)=√41
7.CorrectAnswer:A
Explanation:
Eachoftheintegersinthefirstsetcouldbecombinedwithanyfromthesecondset,givingatotalof4x5=20possiblepairs.
Ofthesethecombinationsthatcouldgiveasumof23are(5+18),and(9+14)
Thismeansthattheprobabilityofgettingasumof23is2/20=1/10
8.CorrectAnswer:C
Explanation:
Ifthepriceisreducedby15%,thenthenewpricewillbe0.85D
Ifthisnewpriceisfurtherreducedby10%,thediscountedpricewillbe0.9x0.85D=0.765D
9.CorrectAnswer:E
Explanation:
Thelongestlinesegmentthatcanbedrawnwithoutpassingthroughanydotsotherthanthoseatthebeginningandendofthesegment,suchalinecouldgofromthemiddledotinthetoprowtoeitherthebottomleftorrightdot.Inanycasethesegmentwillbethehypotenuseofarighttrianglewithsides2and4.UsingPythagorastheoremthehypotenusewillbe√(22+42)=√20
10.CorrectAnswer:D
Explanation:
Iftheradiusis7,thecircumference=14π
Thelengthofthearcis100/360ofthecircumference
Takingπas22/7weget
(100x14x22)/(360x7)whichreducesto440/36=12.22(i.e.approx.12)
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