问题 填空题

计算:(m+3m+5m+…+2009m)-(2m+4m+6m+…+2008m)=______.

答案

(m+3m+5m+…+2009m)-(2m+4m+6m+…+2008m)=m+(3m-2m)+(5m-4m)…+(2009m-2008m)=1005m.

单项选择题
单项选择题