刺梨干多少钱一斤:题目求解

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12/(m^2-9)+2/(m+3)

12/(m^2-9)+2/(m+3)
12/(m+3)(m-3)+2/(m+3)
=[12+2m-6]/[(m+3)(m-3)]
=2[m+3]/[m+3][m-3]
=2/[m-3]