m+3分之m减m的平方-9分之6再除以m减3分之2
问题描述：
m+3分之m减m的平方-9分之6再除以m减3分之2
答
[m/(m+3)-6/(m^2-9)]÷[2/(m-3)]
=[m/(m+3)-6/(m+3)(m-3)]×[(m-3)/2]
={[m(m-3)-6]/[(m+3)(m-3)]}×[(m-3)/2]
=(m^2-3m-6)(m-3)/[2(m+3)(m-3)]
=(m^2-3m-6)/(2m+6)