5m^3+9m^2+9m+7

m-2m-3m+4m-5m-6m+7m-8m-9m+.+2002m-2003m-2004m 2m+3m+5m+7m+9m+…+2003m+2005m+2007m 3m^2-m-[7m-2(4m-5)++9m^2] m-2m-3m+4m-5m-6m+7m.2004m=? (m+3m+5m+7m+.+2009m)-(2m-4m-6m-.-2008m)=? (m+3m+5m+7m+.+2011m)-(2m+4m+6m+.+2010m) 要说理由! 化简：(m/m+3-2m/m+3)÷m/m^-9 相机里面的0.2m 2m 5m 9m 10m 12m 有9条线段分别长1m,2m,3m,4m,5m,6m,7m,8m,9m；从中取出若干条,顺次连接,围成一个正方形,问有多少 (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)