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∵自然數的平方是一個四位數,千位数字是4,又∵1002=10000,92=81,∴這個自然數只能是兩位數,∵個位数字是5,∴這個自然數的個位数字也為5,∵602=3600,802=6400,∴它的十位数字可能是6或7,∵752=5625,652=4225,∴它的十位数字是6,∴這個數為65.故答案為:65.
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