m²-4mn+4n²-4

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m²-4mn+4n²-4
m²-4mn+4n²-4

m²-4mn+4n²-4
m²-4mn+4n²-4
=(m-2n)²-4
=(m-2n+2)(m-2n-2)

求啥?
(m-2n)平方-4
(m-2n+2)(m-2n-2)