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下面为大家总结了最新的gre数学难题。有很多gre考生对gre数学考试十分苦恼，其实最有效的方法就是多练习，把数学基础知识记牢，这样才能在考试中对答如流。而gre数学考试中也会出现一些难题，想拿高分也十分不容易。 51.The percent increase from the least monthly car sales shown to the sales in July 1993 was most nearly equal to____ A.20% B.35% C.45% D.55% E.65% 52. For which symptom are the ratings closest to the arithmetic mean for that symptom, as measured by the standard deviation of its ratings? A.H B.L C.P D.T E.V 53. The cost of sending a package special delivery is x cents per ounce up to 10 ounces and y cents for each ounce in excess 10. Which of the following represents the total cost, in cents, of sending special delivery a package weighing w ounces, if w 10? A. x+y+10 B. x++y C. 10x+10 D.10x+y E. 10x+wy 54. The jewels in a certain tiara consist of diamonds, rubies, and emeralds. If the ratio of diamonds to rubies is 5/6 and the ratio of rubies to emeralds is 8/3, what is the least number of jewels that could be in the tiara? A.16 B.22C.40D.53E.67 55.Column A: The area of the triangular region. | 
