12/m²-9+2/m+3化简
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12/m²-9+2/m+3化简
12/m²-9+2/m+3化简
12/m²-9+2/m+3化简
12/（m^2-9)+2/(m+3)
=[12+2(m-3)]/[(m+3)(m-3)]
=2(m+3)/[(m+3)(m-3)]
=2/(m-3)
12/m²-9+2/m+3化简
12/m²-9+2/m+3化简
12/m²-9+2/m+3化简
12/（m^2-9)+2/(m+3)
=[12+2(m-3)]/[(m+3)(m-3)]
=2(m+3)/[(m+3)(m-3)]
=2/(m-3)