计算:12/m^2-9+2/3-m+2/m+3
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计算:12/m^2-9+2/3-m+2/m+3计算:12/m^2-9+2/3-m+2/m+3计算:12/m^2-9+2/3-m+2/m+312/(m^2-9)+2/(3-m)+2/(m+3)=12/(
计算:12/m^2-9+2/3-m+2/m+3
计算:12/m^2-9+2/3-m+2/m+3
计算:12/m^2-9+2/3-m+2/m+3
12/(m^2-9)+2/(3-m)+2/(m+3)
=12/(m+3)(m-3)-2(m+3)/(m+3)(m-3)+2(m-3)/(m+3)(m-3)
=[12-2(m+3)+2(m-3)]/(m+3)(m-3)
=(12-2m-6+2m-6)/(m+3)(m-3)
=0
=[12-2(m+3)+2(m-3)]/(m+3)(m-3)
=(12-2m-6+2m-6)/(m+3)(m-3)
=0
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