4m,4m,4m,5m,3m,12m,求长方形的体积

(m+3m+5m+.+2008m)-(2m+4m+6m+.+2009m) (m+3m+5m+...+2009m)-(2m+4m+6m+...2008m) m-2m-3m+4m-5m-6m+7m.2004m=? 计算:(m+3m+5m+...+2009m)-(2m+4m+6m+...+2010m) (m+3m+5m+...+2013m)-(2m+4m+6m+...+2012m) (m+3m+5m.+2013m)-(2m+4m+6m+.+2012m)=? (m+3m+5m+...+2014m)-(2m+4m+6m+...+2013m) (m+3m+5m+...+2015m)-(2m+4m+6m+...+2014m)= m+3m+5m+...+2011m-2m-4m-...-2010m等于多少? (m+3m+5m+...+2009m)-(2m+4m+...+2008m)怎么算 合并同类项m-2m+3m-4m+5m-.+2011m-2012m (m+3m+5m+7m+.+2009m)-(2m-4m-6m-.-2008m)=?