求值:12/(m^2-9)加上2/(3-m)

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求值:12/(m^2-9)加上2/(3-m)求值:12/(m^2-9)加上2/(3-m)求值:12/(m^2-9)加上2/(3-m)12/(m^2-9)加上2/(3-m)=12/(m+3)(m-3)+

求值:12/(m^2-9)加上2/(3-m)
求值:12/(m^2-9)加上2/(3-m)

求值:12/(m^2-9)加上2/(3-m)
12/(m^2-9)加上2/(3-m) =12/(m+3)(m-3)+(-2/3-m)=12/(m+3)(m-3)-2/m-3=12/(m+3)(m-3)-2(m+3)/(m+3)(m-3)=6-2m/(m+3)(m-3)