2. 外语
  3. For any numbers a, b, and c, For which of the following equations is it true that there is exactly one positive integer that sat

For any numbers a, b, and c, For which of the following equations is it true that there is exactly one positive integer that sat

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问题 For any numbers a, b, and c, For which of the following equations is it true that there is exactly one positive integer that satisfies it’?
选项 A、none
B、Ⅰ only
C、Ⅲ only
D、Ⅰ and Ⅲ only
E、Ⅰ, Ⅱ, and Ⅲ
答案C
解析
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