GRE习题练习

GRE考试易错题(2017/9/25)
1题:从1,2,3,4,5,6,7,8,9中选出三个数字组成一个三位数,这个三位数的digits中有两个相同,另一个digit与其它两个都不同,问共有多少个这样的三位数?()
A.72
B.144
C.180
D.216
E.54
【分析题】:

2题:符合 X^2+Y^2<=100的整数解共有多少对?
【分析题】:

3题:Thereare1200respondentstoapoll,eachfavoringtheirpreferenceforcandidatesA,B,andC.54%favoredA,48%favoredB,and42%favoredC,andthereis30%favoredbothAandB.what’sthelargestpossiblenumberofrespondentsfavoringC,butnotC&B,norC&A?()
A.25%
B.30%
C.28%
D.38%
E.40%
【分析题】:

4题:RighttrianglePQRistobeconstructedinthexy-planesothattherightangleisatPandPRisparralleltothex-axis.Thex-andy-coordinatesofP,Q,andRaretobeintegersthatsatisfytheinequalities-4<=x<=5,6<=y<=16,howmanydifferenttriangleswiththesepropertiescouldbeconstructed?
A.110
B.1100
C.9900
D.10000
E.12100
【分析题】:

5题:一直线L过点A(5,0),B(0,2),坐标原点为O,点P(X,Y)为三角形OAB中一点,问:Y()
A.1/4
B.3/8
C.1/2
D.5/8
E.3/4
【分析题】:

 

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