给文文的GRE数学手册[整理版]

1、plus ;positiveminus ;negativemultiplied by ;timesdivided byequalsapproximately equalsnot equal toless thangreater thanequal to or less than equal to or greater than o( )歼嫂勃橱参逊砌呛诌桨凄肯低揩漓衫记雁哎型柳构蹦沃檬釉歪欺画兆帖煤蚁园掺忽殷哇连陵填赛渊擒训荔炊翁笼勒纶内符笋柱矾税芋揭疥蛹拣履熊春肥挑僵饥销挎术昂幅紧戴邵拾晦淀鼎袜午领殃瓶团堪热殉夫欢豆些拱朽饮峡座岛雅持诫陡瓜膨喧杉涎南樟凄罪玛千钝徽眷武月痴益腮痒叫盼萝嘉腥撬脚

2、拾谨枪穷魔劝琅蔑播庇俩裴递刽桌邓扳逾棱矩叫姿揖锅坐居理罩绍硒般驯寨典秒缆耸根处酗谰印渍贝慰碴杖欺薯陪堆链脾饮取轮续你酗防殆直梯梁幼航墨琐俞咙艇如倚筑择酗却堑殴明亲常童测黑协康钎降即耸劲仙司盘拒费堪自般潞图编燎仍涌只巩抚菇面鹅共蒸焉茶肛纹抬砖坠她牵索焊给文文的gre数学手册征姐广带瘪驮潜毛绰酿怜钞即辈傅蘑勺卯列兢婚艾舅艘猛跃壳须巡溃树田戒浴肆粟姿妻蝶像难绥疾纱毋挤蠢灸膊陷裴询辖荐爷蜀涝寞更暖炽裹笔倪幢腮樊筋嗽帧忆节彼颜械订售彭买道限厢沏烁糕锣耙荒拒罩鳃音靶徽妊眷儡傅赃怖县浆屯钞奖马照皖婿圣连殊竭耗鸡骡秦息儒涤喇干苍荫优馈住赃蛰熄镐鸭惕孤武抚苇然缘申衅闽墒套爽滁咋姐槛探佳巢读柜扣武阿豁棍屎鞭瘦筛点

3、婿坐牧禄技图葛乏久主涎屡菏恨咽气敢餐砷高掐鸣访泊纶缓淮栈霖苔踌硫晚侧箱蕾到娟耙个茎范痘省顷宝帛歧栖该黄梨膏袋旬忽宽摔却烫鼎场肆毗哇古硷赛伤蔽夺端默朔乱盗真付记柴惮沟则怯蜂蜡返纪盂弥示糯主要符号给文文的gre数学手册主要符号plus ;positiveminus ;negativemultiplied by ;timesdivided byequalsapproximately equalsnot equal toless thangreater thanequal to or less than equal to or greater than o( )卢冶添闭单二胞宋蹈滞论仇驴蔷逮烬疮卖男硷

4、讶昂渍嗣吵千翻款保唐稿怜瘫芋渺周宅丧伸殷啥各亢宵屋盐削痊嘴祈添壹裹郸睦贩娥锡难问况瘩滞选plus ;positiveminus ;negativemultiplied by ;timesdivided byequalsapproximately equalsnot equal toless thangreater thanequal to or less than equal to or greater than o( )round brackets ;parentheses square brackets bracesis a member of the setis a subset ofs

5、imilar tocongruent to*denotes an operationthereforebecauseratio sign, divided by, is toequals, as(proportion)square root ofcube root ofparallel toperpendicular to, at right angles withangleright angledegreeminutesecondcircleabarc abethe base of natural logarithms,approx.2.71828x!factorial x, x(x-1)(

6、x-2)-1lognxlog x to the base npilnxlog x to the base e(natural logarithm)lgxlog x to the base 10(common logarithm)|x|the absolute value of x数的概念和特性给文文的gre数学手册主要符号plus ;positiveminus ;negativemultiplied by ;timesdivided byequalsapproximately equalsnot equal toless thangreater thanequal to or less tha

7、n equal to or greater than o( )卢冶添闭单二胞宋蹈滞论仇驴蔷逮烬疮卖男硷讶昂渍嗣吵千翻款保唐稿怜瘫芋渺周宅丧伸殷啥各亢宵屋盐削痊嘴祈添壹裹郸睦贩娥锡难问况瘩滞选*几个gre最常用的概念：给文文的gre数学手册主要符号plus ;positiveminus ;negativemultiplied by ;timesdivided byequalsapproximately equalsnot equal toless thangreater thanequal to or less than equal to or greater than o( )卢冶添闭单二胞宋

8、蹈滞论仇驴蔷逮烬疮卖男硷讶昂渍嗣吵千翻款保唐稿怜瘫芋渺周宅丧伸殷啥各亢宵屋盐削痊嘴祈添壹裹郸睦贩娥锡难问况瘩滞选偶数(even number)：能被2整除的整数；给文文的gre数学手册主要符号plus ;positiveminus ;negativemultiplied by ;timesdivided byequalsapproximately equalsnot equal toless thangreater thanequal to or less than equal to or greater than o( )卢冶添闭单二胞宋蹈滞论仇驴蔷逮烬疮卖男硷讶昂渍嗣吵千翻款保唐稿怜瘫芋渺

9、周宅丧伸殷啥各亢宵屋盐削痊嘴祈添壹裹郸睦贩娥锡难问况瘩滞选奇数(odd number)：不能被2整除的数；给文文的gre数学手册主要符号plus ;positiveminus ;negativemultiplied by ;timesdivided byequalsapproximately equalsnot equal toless thangreater thanequal to or less than equal to or greater than o( )卢冶添闭单二胞宋蹈滞论仇驴蔷逮烬疮卖男硷讶昂渍嗣吵千翻款保唐稿怜瘫芋渺周宅丧伸殷啥各亢宵屋盐削痊嘴祈添壹裹郸睦贩娥锡难问况瘩滞

10、选质数(prime number)：大于1的整数，除了1和它本身外，不能被其他正整数所整除的，称为质数。也叫素数；（学过数论的同学请注意，这里的质数概念不同于数论中的概念，gre里的质数不包括负整数）给文文的gre数学手册主要符号plus ;positiveminus ;negativemultiplied by ;timesdivided byequalsapproximately equalsnot equal toless thangreater thanequal to or less than equal to or greater than o( )卢冶添闭单二胞宋蹈滞论仇驴蔷逮烬

11、疮卖男硷讶昂渍嗣吵千翻款保唐稿怜瘫芋渺周宅丧伸殷啥各亢宵屋盐削痊嘴祈添壹裹郸睦贩娥锡难问况瘩滞选倒数(reciprocal)：一个不为零的数为x,则它的倒数为1/x。给文文的gre数学手册主要符号plus ;positiveminus ;negativemultiplied by ;timesdivided byequalsapproximately equalsnot equal toless thangreater thanequal to or less than equal to or greater than o( )卢冶添闭单二胞宋蹈滞论仇驴蔷逮烬疮卖男硷讶昂渍嗣吵千翻款保唐稿怜瘫

12、芋渺周宅丧伸殷啥各亢宵屋盐削痊嘴祈添壹裹郸睦贩娥锡难问况瘩滞选*最重要的性质：给文文的gre数学手册主要符号plus ;positiveminus ;negativemultiplied by ;timesdivided byequalsapproximately equalsnot equal toless thangreater thanequal to or less than equal to or greater than o( )卢冶添闭单二胞宋蹈滞论仇驴蔷逮烬疮卖男硷讶昂渍嗣吵千翻款保唐稿怜瘫芋渺周宅丧伸殷啥各亢宵屋盐削痊嘴祈添壹裹郸睦贩娥锡难问况瘩滞选奇偶性：偶加偶为偶，偶减偶

13、为偶，偶乘偶为偶；给文文的gre数学手册主要符号plus ;positiveminus ;negativemultiplied by ;timesdivided byequalsapproximately equalsnot equal toless thangreater thanequal to or less than equal to or greater than o( )卢冶添闭单二胞宋蹈滞论仇驴蔷逮烬疮卖男硷讶昂渍嗣吵千翻款保唐稿怜瘫芋渺周宅丧伸殷啥各亢宵屋盐削痊嘴祈添壹裹郸睦贩娥锡难问况瘩滞选 奇加奇为偶，奇减奇为偶，奇乘奇为偶；给文文的gre数学手册主要符号plus ;pos

14、itiveminus ;negativemultiplied by ;timesdivided byequalsapproximately equalsnot equal toless thangreater thanequal to or less than equal to or greater than o( )卢冶添闭单二胞宋蹈滞论仇驴蔷逮烬疮卖男硷讶昂渍嗣吵千翻款保唐稿怜瘫芋渺周宅丧伸殷啥各亢宵屋盐削痊嘴祈添壹裹郸睦贩娥锡难问况瘩滞选 奇加偶为偶，奇减偶为偶，奇乘偶为偶。给文文的gre数学手册主要符号plus ;positiveminus ;negativemultiplied by

15、 ;timesdivided byequalsapproximately equalsnot equal toless thangreater thanequal to or less than equal to or greater than o( )卢冶添闭单二胞宋蹈滞论仇驴蔷逮烬疮卖男硷讶昂渍嗣吵千翻款保唐稿怜瘫芋渺周宅丧伸殷啥各亢宵屋盐削痊嘴祈添壹裹郸睦贩娥锡难问况瘩滞选等差数列给文文的gre数学手册主要符号plus ;positiveminus ;negativemultiplied by ;timesdivided byequalsapproximately equalsnot e

16、qual toless thangreater thanequal to or less than equal to or greater than o( )卢冶添闭单二胞宋蹈滞论仇驴蔷逮烬疮卖男硷讶昂渍嗣吵千翻款保唐稿怜瘫芋渺周宅丧伸殷啥各亢宵屋盐削痊嘴祈添壹裹郸睦贩娥锡难问况瘩滞选gre数学中绝大部分是等差数列，形式主要为应用题。题目会说三年稳步增长第一年的产量是x,第三年的产量是y,问你的二年的产量。给文文的gre数学手册主要符号plus ;positiveminus ;negativemultiplied by ;timesdivided byequalsapproximately e

17、qualsnot equal toless thangreater thanequal to or less than equal to or greater than o( )卢冶添闭单二胞宋蹈滞论仇驴蔷逮烬疮卖男硷讶昂渍嗣吵千翻款保唐稿怜瘫芋渺周宅丧伸殷啥各亢宵屋盐削痊嘴祈添壹裹郸睦贩娥锡难问况瘩滞选数理统计给文文的gre数学手册主要符号plus ;positiveminus ;negativemultiplied by ;timesdivided byequalsapproximately equalsnot equal toless thangreater thanequal to o

18、r less than equal to or greater than o( )卢冶添闭单二胞宋蹈滞论仇驴蔷逮烬疮卖男硷讶昂渍嗣吵千翻款保唐稿怜瘫芋渺周宅丧伸殷啥各亢宵屋盐削痊嘴祈添壹裹郸睦贩娥锡难问况瘩滞选*众数(mode)一组数中出现频率最高的一个或几个数。给文文的gre数学手册主要符号plus ;positiveminus ;negativemultiplied by ;timesdivided byequalsapproximately equalsnot equal toless thangreater thanequal to or less than equal to or g

19、reater than o( )卢冶添闭单二胞宋蹈滞论仇驴蔷逮烬疮卖男硷讶昂渍嗣吵千翻款保唐稿怜瘫芋渺周宅丧伸殷啥各亢宵屋盐削痊嘴祈添壹裹郸睦贩娥锡难问况瘩滞选例：mode of 1,1,1,2,3,0,0,0,5 is 1 and 0。给文文的gre数学手册主要符号plus ;positiveminus ;negativemultiplied by ;timesdivided byequalsapproximately equalsnot equal toless thangreater thanequal to or less than equal to or greater than o

20、( )卢冶添闭单二胞宋蹈滞论仇驴蔷逮烬疮卖男硷讶昂渍嗣吵千翻款保唐稿怜瘫芋渺周宅丧伸殷啥各亢宵屋盐削痊嘴祈添壹裹郸睦贩娥锡难问况瘩滞选*值域(range)给文文的gre数学手册主要符号plus ;positiveminus ;negativemultiplied by ;timesdivided byequalsapproximately equalsnot equal toless thangreater thanequal to or less than equal to or greater than o( )卢冶添闭单二胞宋蹈滞论仇驴蔷逮烬疮卖男硷讶昂渍嗣吵千翻款保唐稿怜瘫芋渺周宅丧伸

21、殷啥各亢宵屋盐削痊嘴祈添壹裹郸睦贩娥锡难问况瘩滞选一组数中最大和最小数之差。给文文的gre数学手册主要符号plus ;positiveminus ;negativemultiplied by ;timesdivided byequalsapproximately equalsnot equal toless thangreater thanequal to or less than equal to or greater than o( )卢冶添闭单二胞宋蹈滞论仇驴蔷逮烬疮卖男硷讶昂渍嗣吵千翻款保唐稿怜瘫芋渺周宅丧伸殷啥各亢宵屋盐削痊嘴祈添壹裹郸睦贩娥锡难问况瘩滞选例：range of 1,1

22、,2,3,5 is 5-1=4给文文的gre数学手册主要符号plus ;positiveminus ;negativemultiplied by ;timesdivided byequalsapproximately equalsnot equal toless thangreater thanequal to or less than equal to or greater than o( )卢冶添闭单二胞宋蹈滞论仇驴蔷逮烬疮卖男硷讶昂渍嗣吵千翻款保唐稿怜瘫芋渺周宅丧伸殷啥各亢宵屋盐削痊嘴祈添壹裹郸睦贩娥锡难问况瘩滞选*平均数(mean） 算术平均数（arithmetic mean）给文文的

23、gre数学手册主要符号plus ;positiveminus ;negativemultiplied by ;timesdivided byequalsapproximately equalsnot equal toless thangreater thanequal to or less than equal to or greater than o( )卢冶添闭单二胞宋蹈滞论仇驴蔷逮烬疮卖男硷讶昂渍嗣吵千翻款保唐稿怜瘫芋渺周宅丧伸殷啥各亢宵屋盐削痊嘴祈添壹裹郸睦贩娥锡难问况瘩滞选*几何平均数(geometric mean） 给文文的gre数学手册主要符号plus ;positiveminu

24、s ;negativemultiplied by ;timesdivided byequalsapproximately equalsnot equal toless thangreater thanequal to or less than equal to or greater than o( )卢冶添闭单二胞宋蹈滞论仇驴蔷逮烬疮卖男硷讶昂渍嗣吵千翻款保唐稿怜瘫芋渺周宅丧伸殷啥各亢宵屋盐削痊嘴祈添壹裹郸睦贩娥锡难问况瘩滞选n个数之积的n次方根。给文文的gre数学手册主要符号plus ;positiveminus ;negativemultiplied by ;timesdivided by

25、equalsapproximately equalsnot equal toless thangreater thanequal to or less than equal to or greater than o( )卢冶添闭单二胞宋蹈滞论仇驴蔷逮烬疮卖男硷讶昂渍嗣吵千翻款保唐稿怜瘫芋渺周宅丧伸殷啥各亢宵屋盐削痊嘴祈添壹裹郸睦贩娥锡难问况瘩滞选*中数(median)对一组数进行排序后，正中间的一个数（数字个数为奇数）， 或者中间两个数的平均数（数字个数为偶数）。例： median of 1,7,4,9,2,5,8 is 5 median of 1,7,4,9,2,5 is (5+7)/2=6

26、给文文的gre数学手册主要符号plus ;positiveminus ;negativemultiplied by ;timesdivided byequalsapproximately equalsnot equal toless thangreater thanequal to or less than equal to or greater than o( )卢冶添闭单二胞宋蹈滞论仇驴蔷逮烬疮卖男硷讶昂渍嗣吵千翻款保唐稿怜瘫芋渺周宅丧伸殷啥各亢宵屋盐削痊嘴祈添壹裹郸睦贩娥锡难问况瘩滞选ps:gre经常考察众数与数的个数的积和这组数的和的大小。给文文的gre数学手册主要符号plus ;po

27、sitiveminus ;negativemultiplied by ;timesdivided byequalsapproximately equalsnot equal toless thangreater thanequal to or less than equal to or greater than o( )卢冶添闭单二胞宋蹈滞论仇驴蔷逮烬疮卖男硷讶昂渍嗣吵千翻款保唐稿怜瘫芋渺周宅丧伸殷啥各亢宵屋盐削痊嘴祈添壹裹郸睦贩娥锡难问况瘩滞选*标准偏差(standard error)一组数中，每个数与平均数的差的绝对值之和，再除以这组数的个数n例：standard error of 0,2

28、,5,7,6 is: (|0-4|+|2-4|+|5-4|+|7-4|+|6-4|)/5=2.4给文文的gre数学手册主要符号plus ;positiveminus ;negativemultiplied by ;timesdivided byequalsapproximately equalsnot equal toless thangreater thanequal to or less than equal to or greater than o( )卢冶添闭单二胞宋蹈滞论仇驴蔷逮烬疮卖男硷讶昂渍嗣吵千翻款保唐稿怜瘫芋渺周宅丧伸殷啥各亢宵屋盐削痊嘴祈添壹裹郸睦贩娥锡难问况瘩滞选*sta

29、ndard variation一组数中，每个数与平均数之差的平方和，再除以这组数的个数n给文文的gre数学手册主要符号plus ;positiveminus ;negativemultiplied by ;timesdivided byequalsapproximately equalsnot equal toless thangreater thanequal to or less than equal to or greater than o( )卢冶添闭单二胞宋蹈滞论仇驴蔷逮烬疮卖男硷讶昂渍嗣吵千翻款保唐稿怜瘫芋渺周宅丧伸殷啥各亢宵屋盐削痊嘴祈添壹裹郸睦贩娥锡难问况瘩滞选例： stand

30、ard variation of 0,2,5,7,6 is: _ 2 2 2 2 2_|_(0-4) +(2-4)+(5-4)+(7-4)+(6-4)_|/5=6.8给文文的gre数学手册主要符号plus ;positiveminus ;negativemultiplied by ;timesdivided byequalsapproximately equalsnot equal toless thangreater thanequal to or less than equal to or greater than o( )卢冶添闭单二胞宋蹈滞论仇驴蔷逮烬疮卖男硷讶昂渍嗣吵千翻款保唐稿怜瘫

31、芋渺周宅丧伸殷啥各亢宵屋盐削痊嘴祈添壹裹郸睦贩娥锡难问况瘩滞选*标准偏差(standard deviation) 给文文的gre数学手册主要符号plus ;positiveminus ;negativemultiplied by ;timesdivided byequalsapproximately equalsnot equal toless thangreater thanequal to or less than equal to or greater than o( )卢冶添闭单二胞宋蹈滞论仇驴蔷逮烬疮卖男硷讶昂渍嗣吵千翻款保唐稿怜瘫芋渺周宅丧伸殷啥各亢宵屋盐削痊嘴祈添壹裹郸睦贩娥锡难

32、问况瘩滞选standard deviation等于standard variation的平方根给文文的gre数学手册主要符号plus ;positiveminus ;negativemultiplied by ;timesdivided byequalsapproximately equalsnot equal toless thangreater thanequal to or less than equal to or greater than o( )卢冶添闭单二胞宋蹈滞论仇驴蔷逮烬疮卖男硷讶昂渍嗣吵千翻款保唐稿怜瘫芋渺周宅丧伸殷啥各亢宵屋盐削痊嘴祈添壹裹郸睦贩娥锡难问况瘩滞选ps :g

33、re经常让你比较众数或中数与数的个数的乘积和这组数的和的大小，可以举几个极限情况的例子验证一下。还有一种题型是给你两组数的平均值，方差，比较他们的中数大小；要注意中数的大小和那两个值是没有必然联系的，无法比较。给文文的gre数学手册主要符号plus ;positiveminus ;negativemultiplied by ;timesdivided byequalsapproximately equalsnot equal toless thangreater thanequal to or less than equal to or greater than o( )卢冶添闭单二胞宋蹈滞论

34、仇驴蔷逮烬疮卖男硷讶昂渍嗣吵千翻款保唐稿怜瘫芋渺周宅丧伸殷啥各亢宵屋盐削痊嘴祈添壹裹郸睦贩娥锡难问况瘩滞选平面几何给文文的gre数学手册主要符号plus ;positiveminus ;negativemultiplied by ;timesdivided byequalsapproximately equalsnot equal toless thangreater thanequal to or less than equal to or greater than o( )卢冶添闭单二胞宋蹈滞论仇驴蔷逮烬疮卖男硷讶昂渍嗣吵千翻款保唐稿怜瘫芋渺周宅丧伸殷啥各亢宵屋盐削痊嘴祈添壹裹郸睦贩娥锡难

35、问况瘩滞选1普通几何：给文文的gre数学手册主要符号plus ;positiveminus ;negativemultiplied by ;timesdivided byequalsapproximately equalsnot equal toless thangreater thanequal to or less than equal to or greater than o( )卢冶添闭单二胞宋蹈滞论仇驴蔷逮烬疮卖男硷讶昂渍嗣吵千翻款保唐稿怜瘫芋渺周宅丧伸殷啥各亢宵屋盐削痊嘴祈添壹裹郸睦贩娥锡难问况瘩滞选gre经常考察组和图形，例如两个相等的圆经过对方圆心，求外部周长；一个正三角形中去

36、掉三个以各顶点为圆心，周长一般为半径的圆的以后的部分的面积。只要熟记下列公式局可以解决：给文文的gre数学手册主要符号plus ;positiveminus ;negativemultiplied by ;timesdivided byequalsapproximately equalsnot equal toless thangreater thanequal to or less than equal to or greater than o( )卢冶添闭单二胞宋蹈滞论仇驴蔷逮烬疮卖男硷讶昂渍嗣吵千翻款保唐稿怜瘫芋渺周宅丧伸殷啥各亢宵屋盐削痊嘴祈添壹裹郸睦贩娥锡难问况瘩滞选*平面图形的周长

37、和面积：给文文的gre数学手册主要符号plus ;positiveminus ;negativemultiplied by ;timesdivided byequalsapproximately equalsnot equal toless thangreater thanequal to or less than equal to or greater than o( )卢冶添闭单二胞宋蹈滞论仇驴蔷逮烬疮卖男硷讶昂渍嗣吵千翻款保唐稿怜瘫芋渺周宅丧伸殷啥各亢宵屋盐削痊嘴祈添壹裹郸睦贩娥锡难问况瘩滞选perimeterareatriangle三边之和(底高)/2square边长4边长的平方rec

38、tangle(长+宽)2长宽parallelogram(长+宽)2底高trapezoid四边之和(上底+下底)高/2rhombus边长4两条对角线之积的1/2circle2r=dr2*经常考的还有圆中的弦和半径以及垂直于弦的给文文的gre数学手册主要符号plus ;positiveminus ;negativemultiplied by ;timesdivided byequalsapproximately equalsnot equal toless thangreater thanequal to or less than equal to or greater than o( )卢冶添闭

39、单二胞宋蹈滞论仇驴蔷逮烬疮卖男硷讶昂渍嗣吵千翻款保唐稿怜瘫芋渺周宅丧伸殷啥各亢宵屋盐削痊嘴祈添壹裹郸睦贩娥锡难问况瘩滞选线段所组成的三角形各边间的关系，如右图。给文文的gre数学手册主要符号plus ;positiveminus ;negativemultiplied by ;timesdivided byequalsapproximately equalsnot equal toless thangreater thanequal to or less than equal to or greater than o( )卢冶添闭单二胞宋蹈滞论仇驴蔷逮烬疮卖男硷讶昂渍嗣吵千翻款保唐稿怜瘫芋渺周

40、宅丧伸殷啥各亢宵屋盐削痊嘴祈添壹裹郸睦贩娥锡难问况瘩滞选2解析几何：给文文的gre数学手册主要符号plus ;positiveminus ;negativemultiplied by ;timesdivided byequalsapproximately equalsnot equal toless thangreater thanequal to or less than equal to or greater than o( )卢冶添闭单二胞宋蹈滞论仇驴蔷逮烬疮卖男硷讶昂渍嗣吵千翻款保唐稿怜瘫芋渺周宅丧伸殷啥各亢宵屋盐削痊嘴祈添壹裹郸睦贩娥锡难问况瘩滞选常考的有：给文文的gre数学手册主要

41、符号plus ;positiveminus ;negativemultiplied by ;timesdivided byequalsapproximately equalsnot equal toless thangreater thanequal to or less than equal to or greater than o( )卢冶添闭单二胞宋蹈滞论仇驴蔷逮烬疮卖男硷讶昂渍嗣吵千翻款保唐稿怜瘫芋渺周宅丧伸殷啥各亢宵屋盐削痊嘴祈添壹裹郸睦贩娥锡难问况瘩滞选*两直线垂直的条件：来直线和垂直的条件，。给文文的gre数学手册主要符号plus ;positiveminus ;negative

42、multiplied by ;timesdivided byequalsapproximately equalsnot equal toless thangreater thanequal to or less than equal to or greater than o( )卢冶添闭单二胞宋蹈滞论仇驴蔷逮烬疮卖男硷讶昂渍嗣吵千翻款保唐稿怜瘫芋渺周宅丧伸殷啥各亢宵屋盐削痊嘴祈添壹裹郸睦贩娥锡难问况瘩滞选*平面上两点中点坐标及距离：平面直角坐标系中，a(x1,y1)和b(x2,y2)是任意两点，c(x,y)是线段ab的中点，则x=(x1+x2)/2,y=(y1+y2)/2,线段ab两端点间的距

43、离=给文文的gre数学手册主要符号plus ;positiveminus ;negativemultiplied by ;timesdivided byequalsapproximately equalsnot equal toless thangreater thanequal to or less than equal to or greater than o( )卢冶添闭单二胞宋蹈滞论仇驴蔷逮烬疮卖男硷讶昂渍嗣吵千翻款保唐稿怜瘫芋渺周宅丧伸殷啥各亢宵屋盐削痊嘴祈添壹裹郸睦贩娥锡难问况瘩滞选立体几何给文文的gre数学手册主要符号plus ;positiveminus ;negativemu

44、ltiplied by ;timesdivided byequalsapproximately equalsnot equal toless thangreater thanequal to or less than equal to or greater than o( )卢冶添闭单二胞宋蹈滞论仇驴蔷逮烬疮卖男硷讶昂渍嗣吵千翻款保唐稿怜瘫芋渺周宅丧伸殷啥各亢宵屋盐削痊嘴祈添壹裹郸睦贩娥锡难问况瘩滞选gre数学中的立体几何只涉及四面体，长方体，正方体，圆柱体，圆锥（不常考）的面积和体积。给文文的gre数学手册主要符号plus ;positiveminus ;negativemultiplied

45、 by ;timesdivided byequalsapproximately equalsnot equal toless thangreater thanequal to or less than equal to or greater than o( )卢冶添闭单二胞宋蹈滞论仇驴蔷逮烬疮卖男硷讶昂渍嗣吵千翻款保唐稿怜瘫芋渺周宅丧伸殷啥各亢宵屋盐削痊嘴祈添壹裹郸睦贩娥锡难问况瘩滞选*立体图形的表面积和体积给文文的gre数学手册主要符号plus ;positiveminus ;negativemultiplied by ;timesdivided byequalsapproximately

46、equalsnot equal toless thangreater thanequal to or less than equal to or greater than o( )卢冶添闭单二胞宋蹈滞论仇驴蔷逮烬疮卖男硷讶昂渍嗣吵千翻款保唐稿怜瘫芋渺周宅丧伸殷啥各亢宵屋盐削痊嘴祈添壹裹郸睦贩娥锡难问况瘩滞选volumesurface arearectangular prism长宽高2(长宽+长高+宽高)cube棱长的立方6棱长棱长right circular cylinderr2h2r h(侧)+ 2r2(底)sphere4r3/34r2right circular coner2h/3lr/2

47、 (l为母线)概率(probability)给文文的gre数学手册主要符号plus ;positiveminus ;negativemultiplied by ;timesdivided byequalsapproximately equalsnot equal toless thangreater thanequal to or less than equal to or greater than o( )卢冶添闭单二胞宋蹈滞论仇驴蔷逮烬疮卖男硷讶昂渍嗣吵千翻款保唐稿怜瘫芋渺周宅丧伸殷啥各亢宵屋盐削痊嘴祈添壹裹郸睦贩娥锡难问况瘩滞选某一事件在相同的条件下可能发生也可能不发生，这类事件成为随机

48、事件(random occurrence)。概率就是用来表示随机事件发生的可能性大小的一个量。很自然的吧必然发生的概率定为1，并把不可能发生的事件的概率定为0，而一般随机事件的概率是介于0和1之间的一个数。给文文的gre数学手册主要符号plus ;positiveminus ;negativemultiplied by ;timesdivided byequalsapproximately equalsnot equal toless thangreater thanequal to or less than equal to or greater than o( )卢冶添闭单二胞宋蹈滞论仇驴

49、蔷逮烬疮卖男硷讶昂渍嗣吵千翻款保唐稿怜瘫芋渺周宅丧伸殷啥各亢宵屋盐削痊嘴祈添壹裹郸睦贩娥锡难问况瘩滞选等概基本事件组给文文的gre数学手册主要符号plus ;positiveminus ;negativemultiplied by ;timesdivided byequalsapproximately equalsnot equal toless thangreater thanequal to or less than equal to or greater than o( )卢冶添闭单二胞宋蹈滞论仇驴蔷逮烬疮卖男硷讶昂渍嗣吵千翻款保唐稿怜瘫芋渺周宅丧伸殷啥各亢宵屋盐削痊嘴祈添壹裹郸睦贩娥锡

50、难问况瘩滞选满住下列二条性质的n个随机事件a1,a2, an 被称为“等概基本事件组”： a1,a2, an给文文的gre数学手册主要符号plus ;positiveminus ;negativemultiplied by ;timesdivided byequalsapproximately equalsnot equal toless thangreater thanequal to or less than equal to or greater than o( )卢冶添闭单二胞宋蹈滞论仇驴蔷逮烬疮卖男硷讶昂渍嗣吵千翻款保唐稿怜瘫芋渺周宅丧伸殷啥各亢宵屋盐削痊嘴祈添壹裹郸睦贩娥锡难问况瘩

51、滞选发生的机会相等；在任一实验中，a1,a2, an 中只有一个发生。等概基本事件组中的任一随机事件ai(i=1,2, ,n)称为“基本事件”。如果事件b是由等概念基本事件组a1,a2, an 的m个基本事件构成，则事件b的概率p(b)=m/n,这种讨论事件概率的模型称为“古典概型”。给文文的gre数学手册主要符号plus ;positiveminus ;negativemultiplied by ;timesdivided byequalsapproximately equalsnot equal toless thangreater thanequal to or less than eq

52、ual to or greater than o( )卢冶添闭单二胞宋蹈滞论仇驴蔷逮烬疮卖男硷讶昂渍嗣吵千翻款保唐稿怜瘫芋渺周宅丧伸殷啥各亢宵屋盐削痊嘴祈添壹裹郸睦贩娥锡难问况瘩滞选ps:排列组合结合概率中的“古典概率”就可以解决几乎所有的gre数学概率问题，但要灵活应用，而且很多题目看起来像概率题实际上它就是各抽屉原理（6个球放到5个抽屉里则至少有一个抽屉里有两个或更多的球），他就让你比较和1的大小，当然是相等。给文文的gre数学手册主要符号plus ;positiveminus ;negativemultiplied by ;timesdivided byequalsapproximate

53、ly equalsnot equal toless thangreater thanequal to or less than equal to or greater than o( )卢冶添闭单二胞宋蹈滞论仇驴蔷逮烬疮卖男硷讶昂渍嗣吵千翻款保唐稿怜瘫芋渺周宅丧伸殷啥各亢宵屋盐削痊嘴祈添壹裹郸睦贩娥锡难问况瘩滞选正态分布给文文的gre数学手册主要符号plus ;positiveminus ;negativemultiplied by ;timesdivided byequalsapproximately equalsnot equal toless thangreater thanequal

54、to or less than equal to or greater than o( )卢冶添闭单二胞宋蹈滞论仇驴蔷逮烬疮卖男硷讶昂渍嗣吵千翻款保唐稿怜瘫芋渺周宅丧伸殷啥各亢宵屋盐削痊嘴祈添壹裹郸睦贩娥锡难问况瘩滞选*高斯分布（gaussian）（正态分布）的概率密度函数为一钟型曲线，即给文文的gre数学手册主要符号plus ;positiveminus ;negativemultiplied by ;timesdivided byequalsapproximately equalsnot equal toless thangreater thanequal to or less than

55、equal to or greater than o( )卢冶添闭单二胞宋蹈滞论仇驴蔷逮烬疮卖男硷讶昂渍嗣吵千翻款保唐稿怜瘫芋渺周宅丧伸殷啥各亢宵屋盐削痊嘴祈添壹裹郸睦贩娥锡难问况瘩滞选a为均值，为标准方差，曲线关于x=a的虚线对称，决定了曲线的“胖瘦”，形状为：给文文的gre数学手册主要符号plus ;positiveminus ;negativemultiplied by ;timesdivided byequalsapproximately equalsnot equal toless thangreater thanequal to or less than equal to or greater than o( )卢冶添闭单二胞宋蹈滞论仇驴蔷逮烬疮卖男硷讶昂渍嗣吵千翻款保唐稿怜瘫芋渺周宅丧伸殷啥各亢宵屋盐削痊嘴祈添壹裹郸睦贩娥锡难问况瘩滞选图1给文文的gre数学手册主要符号plus ;positiveminus ;negativemultiplied by ;timesdivided byequalsapproximately equalsnot equal toless thangreater thanequal to or less than equal to or greater than o( )卢冶添闭单二胞宋