m^2-4n^2+2m-4m (因式分解)

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m^2-4n^2+2m-4m (因式分解)
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m^2-4n^2+2m-4m (因式分解)
m^2-4n^2+2m-4m (因式分解)

m^2-4n^2+2m-4m (因式分解)
m^2-4n^2+2m-4n
=(m^2-4n^2)+(2m-4n)
=(m+2n)(m-2n)+2(m-2n)
=(m-2n)[(m+2n)+2]
=(m-2n)(m+2n+2)

m^2-4n^2+2m-4n
=(m^2-4n^2)+(2m-4n)
=(m+2n)(m-2n)+2(m-2n)
=(m-2n)(m+2n+2)