因式分解:(1)m^2-n^2+2m-2n (2)a^2-(b^2+2b+1)

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因式分解:(1)m^2-n^2+2m-2n (2)a^2-(b^2+2b+1)

因式分解:(1)m^2-n^2+2m-2n (2)a^2-(b^2+2b+1)
因式分解:(1)m^2-n^2+2m-2n (2)a^2-(b^2+2b+1)

因式分解:(1)m^2-n^2+2m-2n (2)a^2-(b^2+2b+1)
(1)m^2-n^2+2m-2n =(m-n)(m+n+2)
(2)a^2-(b^2+2b+1) = a^2 - (b+1)^2 = (a+b+1)(a-b-1)