GWD第二套数学问题

狮子珊 · 发表于 2012-3-15 17:35:37

亲们~~想请教大家几道数学题~~~谢谢你们~！就是GWD的第二套里的数学题。。
2.When positive integer x is divided by positive integery,the remainder is 9.If x/y=96.12,what is the value of y? 答案：B75

26.There are 8 books on a shelf,of which 2 are paperbacks and 6 are hardbacks.How many possible selections of 4 books from this self include at least one paperback?
答案：D 55

31.There are 8 magazines lying on a table;4 are fashion magazines and the other 4 are sports magazines.If 3 magazines are to be selected at random from the 8 magazines,what is the probability that at least one of the fashion magazines will be selected?
答案： E 13/14

37.What is the sum of the integers from -190 to 195,inclusive?

答案：E。965

linhan50 · 发表于 2012-3-15 17:49:45

2.设成x=96y+9 然后一起除以y就等于 x/y=96+9/y=96.12
所以9/y=0.12

linhan50 · 发表于 2012-3-15 17:53:09

26 假设none of them is paperback ，取法就有C46种。然后全部的取法有C48种
C48-C46=55

包子跑来跑去 · 发表于 2012-3-15 17:53:18

第一个用9/0.12

第二个分成1本pb3本hb 和2本pb2本hb来做

linhan50 · 发表于 2012-3-15 17:54:49

31.同26 假设一本都没取到。1-一本都没取到的概率=1-1/14

linhan50 · 发表于 2012-3-15 17:55:45

37.-190到0 与0到190相互抵消。然后算191+。。。。+195就ok了

狮子珊 · 发表于 2012-3-15 19:12:49

谢谢你们啊~！你们真好人~！

GWD第二套数学问题

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