2. 外语
  3. x is the sum of the first 25 positive even integers, y is the sum of the first 25 positive odd integers. Column A

x is the sum of the first 25 positive even integers, y is the sum of the first 25 positive odd integers. Column A

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问题 x is the sum of the first 25 positive even integers, y is the sum of the first 25 positive odd integers.

Column A              Column B
x                      y+25
选项 A、if the quantity in Column A is greater
B、if the quantity in Column B is greater
C、if the two quantity are equal
D、if the relationship cannot be determined from the information given
答案C
解析 x是前25个正偶数(positive even integer)之和，y是前25个正奇数(positive odd integer)之和。
解：本题的正确答案为(C)。由第n个偶数总比第n个奇数多1(n为正整数)，可知前25个正偶数之和比前25个正奇数之和大25。
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