5.(2)分解因式:(m^2-1)(n^2-1)+4mn

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5.(2)分解因式:(m^2-1)(n^2-1)+4mn5.(2)分解因式:(m^2-1)(n^2-1)+4mn5.(2)分解因式:(m^2-1)(n^2-1)+4mn(m^2-1)(n^2-1)+4

5.(2)分解因式:(m^2-1)(n^2-1)+4mn
5.(2)分解因式:(m^2-1)(n^2-1)+4mn

5.(2)分解因式:(m^2-1)(n^2-1)+4mn
(m^2-1)(n^2-1)+4mn
=(m-1)(m+1)(n-1)(n+1)+4mn
=[(m-1)n+(m+1)][m(n-1)+(n+1)]
=(m-n+mn+1)(n-m+mn+1)