GMAT数学精华题型解析(5).

　　GMAT数学考试常见题型的解题技巧有哪些呢?以下将为大家深入分析GMAT数学考试常见题型的解题策略和技巧，希望能够为考生备战GMAT数学考试带来帮助。

　　114. 11816-!-item-!-187;#058&007868

　　Henry purchased 3 items during a sale. He received a 20 percent discount off the regular price of the most expensive item and a 10 percent discount off the regular price of each of the other 2 items. Was the total amount of the 3 discounts greater than 15 percent of the sum of the regular prices of the 3 items?

　　(1) The regular price of the most expensive item was $50, and the regular price of the next most expensive item was $20. (当3项只提供了其中两项数据时，要注意是否可以通过大小比较得到第三个数据的范围。类似题很多，均为陷阱)

　　(2) The regular price of the least expensive item was $15.

　　【答案】A

　　135. 13860-!-item-!-187;#058&009754

　　During a one-day sale, a store sold each sweater of a certain type for $30 more than the store&aposs cost to purchase each sweater. How many of these sweaters were sold during the sale?

　　(1) During the sale, the total revenue(收入!不是利润!!) from the sale of these sweaters was $270.

　　(2) During the sale, the store sold each of these sweaters at a price that was 50 percent greater than the store&aposs cost to purchase each sweater.

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　　【答案】C

　　139. 14108-!-item-!-187;#058&009811

　　A set of 15 different integers has a median of 25 and a range of 25. What is the greatest possible integer that could be in this set?

　　(A) 32

　　(B) 37

　　(C) 40

　　(D) 43

　　(E) 50

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　　【答案】 D

　　【思路】

　　Range定義=最大值-最小值

　　題目問說哪個最有可能是最大值,所以從最大的先推推看,遇到直接做起来难的题目，从答案分析

　　E)Max:50,range25代表Min=50-25=25 ==>可是25又是中位數,所以不可能!!

　　D)Max:43,range25代表Min=43-25=18

　　列舉驗證一下: 18 19 20 21 22 23 24 25 ........43

　　總共15個,所以中位數左邊應該有7個

　　剛好25也是中位數,所以成立!!

　　[另解]

　　因為range25,各選項間距為

　　=>(7~32)(12~37)(15~40)(18~43)(25~50)

　　由於15個不同的數字,此外,中位數為25=>只有D選項符合

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　　142. 14580-!-item-!-187;#058&010013

　　The rate of a certain chemical reaction is directly proportional(正比于) to the square of the concentration of chemical A present and inversely proportional to (反比于)the concentration of chemical B present. If the concentration of chemical B is increased by 100 percent, which of the following is closest to the percent change in the concentration of chemical A required to keep the reaction rate unchanged?

　　(A) 100% decrease

　　(B) 50% decrease

　　(C) 40% decrease

　　(D) 40% increase

　　(E) 50% increase

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　　【答案】D

　　174. 17336-!-item-!-187;#058&011114

　　In the xy-plane, what is the y-intercept of line l

　　(1) The slope of line l is 3 times its y-intercept.

　　(2) The x-intercept of line l is -一定要代入后看是否能可以解—常考陷阱

　　【答案】E

　　177. 17595-!-item-!-187;#058&011159

　　If x and y are positive integers, what is the value of xy ?

　　(1) The greatest common factor of x and y is 10.

　　(2) The least common multiple of x and y is 180.

　　【答案】C

　　两个数的乘积=其最大公约数*最小公倍数

　　以上为大家推荐了一些GMAT数学试题的使用解题技巧，考生不妨从中借鉴，通过针对性的练习来逐步掌握GMAT数学考试的解题技巧，从而在GMAT考试中发挥出更好的水平。 相关链接：

1.GMAT考试流程全攻略：考试流程

2.关于GMAT语法备考的一些感悟

3.GMAT考试流程全攻略：关于考位

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