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A teacher wrote down on the blackboard some consecutive nature numbers starting from 1,2,3......Then he erased a certain number from them,and the average of the rest numbers was十三又是三分之八.Try to find the number erased.
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A teacher wrote down on the blackboard some consecutive nature numbers starting from 1,2,3......Then he erased a certain number from them,and the average of the rest numbers was十三又是三分之八.Try to find the number erased.
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答案：2.3.4 被擦掉了
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