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(a+c)-(c+b)=(a-b)=(a+b)(a-b)=-3由於a、b為正整數,所以a+b為大於1的正整數,且a-b為整數,所以a+b=3,a-b=-1 a=1,b=2,於是c=9,因為c為正整數,所以c=3
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