计算18/m^2-9+3/3-m
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计算18/m^2-9+3/3-m计算18/m^2-9+3/3-m计算18/m^2-9+3/3-m18/m^2-9+3/3-m=18/(m-3)(m+3)-3/(m-3)=18/(m-3)(m+3)-3
计算18/m^2-9+3/3-m
计算18/m^2-9+3/3-m
计算18/m^2-9+3/3-m
18/m^2-9+3/3-m
=18/(m-3)(m+3)-3/(m-3)
=18/(m-3)(m+3)-3(m+3)/(m-3)(m+3)
=(18-3(m+3))/(m-3)(m+3)
=(9-3m)/(m-3)(m+3)
=-3/(m+3)
初二的吧
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