2. 外语
  3. If a ◇ b is defined as , where a ≠ b. Which of the following has a value of 3?

If a ◇ b is defined as , where a ≠ b. Which of the following has a value of 3?

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问题 If a ◇ b is defined as , where a ≠ b. Which of the following has a value of 3?
选项 A、1◇3
B、3◇0
C、6◇2
D、2 ◇6
E、3◇(-1)
答案E
解析 此题只能一个一个选项去试。
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