2. 外语
  3. Let |x|= 3, if x is an odd integer; Let |x|= 6, if x is an even integer. r and s are integers, 3r is odd, and 5+5 is odd. Col

Let |x|= 3, if x is an odd integer; Let |x|= 6, if x is an even integer. r and s are integers, 3r is odd, and 5+5 is odd. Col

admin2009-05-19  58
问题 Let |x|= 3, if x is an odd integer;
Let |x|= 6, if x is an even integer.
r and s are integers, 3r is odd, and 5+5 is odd.

Column A                     Column B
|r|                          |s|
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B
解析 如果x是奇数，令|x|=3；如果x是偶数，令|x|=6。r和s是整数，3r是奇数，5+s是奇数
解：本题的正确答案为(B)。要解答此题，首要的是判断r、s的奇偶性。根据本章中所讲的奇数和偶数的性质可知若3r是奇数，则r也是奇数；5+s是奇数，可推出s是偶数。再根据题目中所给出的运算规则，可推知：|r|=3， |s|=6。
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