m²-9分之m-15-3-m分之2,化简

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m²-9分之m-15-3-m分之2,化简
m²-9分之m-15-3-m分之2,化简

m²-9分之m-15-3-m分之2,化简
=(m-15)/(m+3)(m-3) - 2(m+3) /《-(m-3)(m+3)》
=m-15+2m+6/(m+3)(m-3)
=3m-9/(m+3)(m-3)
=3(m-3)/(m+3)(m-3)
=3/(m+3)