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题库 > 数学PS > 题目9fhuxk
If |a| = |b|, which of the following must be true?

I. a = b

II. |a| = -b

III. -a = -b
  • AI only
  • BII only
  • CIII only
  • DI and III only
  • ENone
显示答案
正确答案: E

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