2. 外语
  3. 4-n □ 6 4-n □ 5 Which of the following symbols should be substituted for □ to make both of the statements above true for all in

4-n □ 6 4-n □ 5 Which of the following symbols should be substituted for □ to make both of the statements above true for all in

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问题 4-n □ 6
4-n □ 5
Which of the following symbols should be substituted for □ to make both of the statements above true for all integers n such that -2
选项 A、≤
B、<
C、=
D、>
E、≥
答案A
解析 下面哪一个符号应当代替“□”，使上面两个式子对所有的满足一2解：本题的正确答案是(A)。该题实际上也就是找一个符号填入两个式子中，使得当n取-2”或“≥”时，可得出n<-2或n≤-2，n的取值范围将落在-2-1或n≥-1。若取“<”，n=-l这个值无法满足上面两式，所以只有“≤”能满足本题的要求。
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