(m+3m+5m+...+2009m)-(2m+4m+6m+...2008m)
1个回答
3m-2m=m 5m-4m=m……2009m-2008m=m
相当于m+m+m+……m总共2009
答案2009m
相关问题
(m+3m5m+7m+.2009m)-(2m+4m+6m.2008m)
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合并同类项:(m+3m+5m+…+2009m)-(2m+4m+6m+…+2008m)
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