巍哥数学-GRE数学第一次直播.pptVIP

4. If n is a positive odd integer and k=n3+2n, what is the value of (-1)k-(-1)k+1? A. -2 B. -1 C. 0 D. 1 E. 2 正确答案：A 5. If n and m are positive integers and m is a factor of 26, what is the greatest possible number of integers that can be equal to both 3n and 26/m? A. Zero B. One C. Three D. Four E. Six 正确答案：A 6. The population of Country X for 1980 was p. The population of Country X increased by 3.8 percent in each of the next two years. Quantity A Quantity B The population of 1.076p Country X for 1982 Quantity A is greater. Quantity B is greater. The two quantities are equal. The relationship cannot be determined from the information given. 正确答案：A 7. n is an integer, and k is not an integer. 0＜k＜n＜k+2 Quantity A Quantity B n k+1 Quantity A is greater. Quantity B is greater. The two quantities are equal. The relationship cannot be determined from the information given. 正确答案：D 8. Of the students in a certain group, 22 percent are juniors and 26 percent are seniors. Quantity A Quantity B The ratio of the number of juniors in the group to the 4/5 number of seniors in the group Quantity A is greater. Quantity B is greater. The two quantities are equal. The relationship cannot be determined from the information given. 正确答案：A 9. The reciprocal of x-2 is x+2. Quantity A Quantity B x 3 Quantity A is greater. Quantity B is greater. The two quantities are equal. The relationship cannot be determined from the information given. 正确答案：B 10. 1/2<r<1 Quantity A Quantity B 2r 1/r Quantity A is greater. Quantity B is greater. The two quantities are equal. The relationship