2019 年 5 月 17 日 GRE 数学预测 冲刺满分 170 精选资料

 

2019 年 5 月 17 日场次gre数学预测发布,详细内容包括对 5 月 17 日 GRE 数学各大高频考点题型的具体讲解和解题思路剖析,确保考生不在简单数学部分意外失分,顺利拿到高分满分!

2019 年 5 月 17 日 GRE 其他题型预测:作文 / 阅读 / 逻辑 / 填空 / 等价 请走这里

题目

1. Two librarians, Robert and Patricia, cataloged a combined total of 180 new books, each of which was cataloged by only one of the two librarians. Although they spent the same amount of time cataloging their books, Robert spent an average of 15 minutes per book whereas Patricia spent an average of 12 minutes per book.

Quantity A:The number of books cataloged by Robert

Quantity B:60

A. Quantity A is greater.

B. Quantity B is greater.

C. The two quantities are equal.

D. The relationship cannot be determined from the information given.

答案:A

解析:设 Robert 整理了 x 本书,Patricia 整理了 y 本书,可得二元一次方程组,x+y=180,15x=12y. 所以 x=80,y=100. 所以 A 为 80,B 为 60,A 比 B 大。

2. One of the solutions of the equation x^2+bx+c= 0 is -3.

Quantity A:3b

Quantity B:c+9

答案:C

解析:把 x= -3 带入等式,即 9-3b+c=0, 即 3b=c+9. 所以 A 和 B 相等。

3. Which of the following is NOT the sum of a set of consecutive positive integers one of which is 1?

A. 3

B. 10

C. 15

D. 28

E. 35

答案:E

解析:从 1 开始的连续正整数相加,A 是 1+2,B 是 1 加到 4,C 是 1 到 5,D 是 1 到 7,而 1 到 8 应该是 36,所以 E 是错误的,选 E。

4. Each of the 176 people in a group drinks at least one of three beverages — coffee, tea or soda. Of the 94 people in the group who drink coffee, 50 drink only coffee. Of the 82 people in the group who drink tea, 40 drink only tea. Of the 66 people in the group who drink soda, 30 drink only soda. If 10 people in the group drink all three beverages, which of the following statements are true about the people in the group? Indicate all such statements.

A. More people drink only soda than drink only tea.

B. There are 46 people who drink only two of the beverages.

C. There are 56 people who drink more than one of the beverage.

答案:B C

解析:A 选项错误,因为有 30 个人只喝 soda,40 个人只喝 tea. 所以喝 soda 的人更少。所以 A 错误。

只喝一种饮料的人共有 120 个。一共 176 个人,所以有 56 个人喝一种以上的饮料,所以 C 正确。

题中又说有 10 个人喝三种饮料,所以只有 46 个人喝两种饮料,所以 B 正确。

5. If f ( x ) = 5-2x and f ( 3k ) = f ( k+1 ) , then f ( k ) =?

A. 0.5

B. 1

C. 3

D. 4

E. 6

答案:D

解析:因为 f ( x ) = 5-2x,所以 f ( 3k ) = 5-6k. f ( k + 1 ) = 5-2 ( k+1 ) = 3-2k.

因为 f ( 3k ) = f ( k + 1 ) , 所以 5-6k = 3-2k. 所以 k=0.5.

所以 f ( k ) = f ( 0.5 ) . f ( 0.5 ) = 4. 所以选 D.

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