2m/m^2-9-1/m+3(计算)
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2m/m^2-9-1/m+3(计算)
2m/m^2-9-1/m+3(计算)
2m/m^2-9-1/m+3(计算)
2m/m^2-9-1/m+3
=2m/(m+3)(m-3)-1/(m+3)
=2m/(m+3)(m-3)-(m-3)/(m+3)(m-3)
=[2m-(m-3)]/(m+3)(m-3)
=(m+3)/(m+3)(m-3)
=1/(m-3)
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