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[Issue Essay]

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题目：

Analytical!

选项:

答案:

提问：

请老师讲下第七题思路。我的理解是条件1可以判断，想要成立则xy的个位数应该是5或者0，这样次方之后依然是5或者0，即xy的个位应该相等，所以答案是No。老师，我是错误理解题意了吗？

解答：

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