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The units digit of $$7^{n}$$ is r, and the units digit of $$9^{n}$$ is t, where n, r, and t are positive integers. Which of the following could be the value of r+t?
Indicate all such values.
Indicate all such values.
A,B,D显示答案
· 相关考点
1.8.3 指数幂的个位循环性
以上解析由 考满分老师提供。