2. 外语
  3. If integers M and N are positive and have the same digits, but in reverse order, which of the following CANNOT be the difference

If integers M and N are positive and have the same digits, but in reverse order, which of the following CANNOT be the difference

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问题 If integers M and N are positive and have the same digits, but in reverse order, which of the following CANNOT be the difference of M and TV?
选项 A、19,197
B、-99
C、43,218
D、54
E、2,816
答案E
解析 由于M和N是reverse，那么M-N应该是9的倍数，E中的2816连3都不能够整除，当然不能够被9整除，所以选择E。
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