(m+3m+5m+...+2015m)-(2m+4m+6m+...+2014m)=
问题描述:
(m+3m+5m+...+2015m)-(2m+4m+6m+...+2014m)=
答
=m+(3m-2m)+(5m-4m)+……+(2015m-2014m)
=m+1007m
=1008m