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將原方程整理為: MX+X=3 (M+1)X=3 X=3/(M+1) 由於X是正整數,所以(M+1)必須是正整數,且必須是3的約數,才能整除,而3是質數,它的約數只有1和它本身,所以有兩種情形: M+1=1,得M=0,此時X=3, M+1=3,得M=2,此時X=1; 由於M為正整數,所以M=2.
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