发布时间:2019-08-15 03:14:40
[m+2+5/(2-m)]*(2m-4)/3-m*(m+3)
=[(m+2)+5/(2-m)]*2(m-2)/3-(m^2+3m)
=2/3(m-2)*(m+2)+5/(2-m)*2(m-2)/3-(m^2+3m)
=2/3(m^2-4)-10/3-m^2-3m
=2/3m^2-8/3-10/3-m^2-3m
=-m^2/3-3m-6
=-1/3*(m^2+9m+18)
=-1/3*(m+3)(m+6)