爱上海后花园

求把n&sup3-3n&sup2-n+3=0化成(n-3)(n+1)(n-1)=0的具体过程和方法

n179;3n178;n3=0n^3n3n^23=0nn^213n^21=0n3n^21=0n3n1n1=0...

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