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【简答题】
观察下列算式:2 1 =2,2 2 =4,2 3 =8,2 4 =16,2 5 =32,2 6 =64,2 7 =128,2 8 =256.通过观察,8 25 的末位数字是(    )
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100
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69
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100
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