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設兩個數為x,y且x>y (x-y)(x+y)=1995 要兩個自然數相差最多,即x-y儘量大 1995=3×5×7×19 x-y= 1,3,5,7,15,19,21,35 x+y=1955665399285133105,95,57 所以x-y=35 x+y=57 所以x=46,y=11
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