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是5的倍數個位上就一定是0或5那麼兩位數一定不會太大,因為這個數大了因數就不會在48的範圍內.因數包含1和本身所以本身不能超過48.那麼就有10、15、20、25、30、35、40這幾個,經實驗得知這個兩位數為35
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