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540分解質因數為:2、2、3、3、3、5.所以滿足要求的自然數有:1個質因數的情况有3個:2、3、5.2個質因數的情况有5個:4、6、10、9、15.3個質因數的情况有6個:20、12、18、30、27、45.4個質因數的情况有5個:90、54…
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