2m+3m+5m+7m+9m+…+2003m+2005m+2007m
2m+3m+5m+7m+9m+…+2003m+2005m+2007m
m-2m-3m+4m-5m-6m+7m-8m-9m+.+2002m-2003m-2004m
m-2m-3m+4m-5m-6m+7m.2004m=?
M
(\M/)
M.
“m
(m+3m+5m+7m+.+2009m)-(2m-4m-6m-.-2008m)=?
(m+3m+5m+7m+.+2011m)-(2m+4m+6m+.+2010m) 要说理由!
(m+3m+5m+.+2008m)-(2m+4m+6m+.+2009m)
(m+3m+5m+...+2009m)-(2m+4m+6m+...2008m)
计算:(m+3m+5m+...+2009m)-(2m+4m+6m+...+2010m)