3－m 2m－4÷(m+2－5 m－2);

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3－m 2m－4÷(m+2－5 m－2);
3－m/2m－4÷(m+2－5/m－2);
/是分数线,

(3－m)/(2m－4)÷[m+2－5/(m－2)]
=(3－m)/(2m－4)÷[(m^2-4-5)/(m－2)]
=(3－m)/(2m－4)÷[(m^2-9)/(m－2)]
=(3－m)/(2m－4)÷[(m-3)(m+3)/(m－2)]
=(3－m)/(2m－4)*(m-2)/(m-3)(m+3)
=-(m-3)/2(m－2)*(m-2)/(m-3)(m+3)
=-1/2(m+3)
=-1/(2m+6)

(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)=?