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把1992分解為最簡數的乘積:1992-->2×996-->2×498-->2×249-->3×83即1992=2×2×2×3×83等式左邊有1( )9( )9( )2和19( )9( )2兩種組合,很容易看出19( )9( )2不可能組合成83或83的倍數,只能組合成1992因子1=19-9...
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