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1、新东方在线[www.koolearn.com]网络课堂电子教材系列GMAT数学GMAT数学电子讲义主讲:王燚欢迎使用新东方在线电子教材GMAT数学备考关键词一、知识点:准确掌握二、词汇、表达法:读懂题目三、熟练:平均两分钟一道题考试相关问题一、时间与题量二、题型三、机经与换题库四、其它Ifaandbarepositiveintegerssuchthata–banda/barebothevenintegers,whichofthefollowingmustbeanoddinteger?(A)a/2(B)b/2(C)(a+b
2、)/2(D)(a+2)/2(E)(b+2)/2IfMistheleastcommonmultipleof90,196,and300,whichofthefollowingisNOTafactorofM?(A)600(B)700(C)900(D)2,100(E)4,900复习注意事项*战略上重视*初等数学的思维*解法力求稳妥清晰*把握好DS题型*熟练重于技巧20新东方在线[www.koolearn.com]网络课堂电子教材系列GMAT数学推荐复习步骤*知识点查缺补漏*背熟词汇*复习课上所学*OG,及其它相关资料*机经:ww
3、w.chasedream.com第一章算术1.integer(wholenumber):整数*positiveinteger:正整数,从1开始,不包括0。2.odd&evennumber奇数与偶数*凡整数均具有奇偶性,如-1是奇数,0是偶数。*奇+奇=偶,奇+偶=奇…若干个整数相乘,除非都是奇数,其乘积才会是奇数…例:Ifaandbarepositiveintegerssuchthata–bandarebothevenintegers,whichofthefollowingmustbeanoddinteger?(A)(B
4、)(C)(D)(E)3.primenumber&compositenumber质数与合数*Aprimenumberisapositiveintegerthathasexactlytwodifferentpositivedivisors,1anditself.*Acompositenumberisapositiveintegergreaterthan1thathasmorethantwodivisors.*Thenumbers1isneitherprimenorcomposite,2istheonlyevenprimenu
5、mber.4.factor(divisor)&primefactor因子和质因子*一个数能被哪些数整除,这些数就叫它的因子(因数、约数)。*因子里的质数叫质因子(数)。例1:Ifn=4p,wherepisaprimenumbergreaterthan2,howmanydifferentpositiveevendivisorsdoesnhave,includingn?(A)2(B)3(C)4(D)6(E)8例2:Iftheintegernhasexactlythreepositivedivisors,including1a
6、ndn,howmanypositivedivisorsdoesn2have?(A)4(B)5(C)6(D)8(E)9例3:1225有几个因子?例:Whatisthegreatestprimefactorof2100-296?(A)2(B)3(C)5(D)7(E)1120新东方在线[www.koolearn.com]网络课堂电子教材系列GMAT数学例:Apositiveintegernissaidtobe“prime-saturated”iftheproductofallthedifferentpositiveprimef
7、actorsofnislessthanthesquarerootofn.Whatisthegreatesttwo-digitprime-saturatedinteger?(A)99(B)98(C)97(D)96(E)955.thegreatestcommondivisor(GCD)&theleastcommonmultiple(LCM)最大公约数和最小公倍数例:IfMistheleastcommonmultipleof90,196,and300,whichofthefollowingisNOTafactorofM?(A)
8、600(B)700(C)900(D)2,100(E)4,900例:Whatisthelowestpositiveintegerthatisdivisiblebyeachoftheintegers1through7,inclusive?(A)420(B)840(C)1,260(D)2,520(E)5,0406.deci