计算:12/m^2-9-2/m-3
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计算:12/m^2-9-2/m-3
![计算:12/m^2-9-2/m-3](/uploads/image/z/3261561-33-1.jpg?t=%E8%AE%A1%E7%AE%97%EF%BC%9A12%2Fm%5E2-9-2%2Fm-3)
=12/(m+3)(m-3)-2/(m-3)
=(12-2(m+3))/(m+3)(m-3)
=(6-2m)/(m+3)(m-3)
=-2/(m+3)
=(12-2(m+3))/(m+3)(m-3)
=(6-2m)/(m+3)(m-3)
=-2/(m+3)
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计算:12/m^2-9-2/m-3
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