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1000÷3=333餘1 即能被3整除的有333個 1000÷7=142餘6 即能被7整除的有142個 1000÷21=47餘13 即能同時被3和7整除的,有47個 那麼,能被3整除,或能被7整除的,有: 333+142-47=428個
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