m-2m-3m+4m-5m-6m=m-2m-3m+4m-5m-6m+···+2002m-2003m-2004m
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m-2m-3m+4m-5m-6m=m-2m-3m+4m-5m-6m+···+2002m-2003m-2004mm-2m-3m+4m-5m-6m=m-2m-3m+4m-5m-6m+···+2002m-2
m-2m-3m+4m-5m-6m=m-2m-3m+4m-5m-6m+···+2002m-2003m-2004m
m-2m-3m+4m-5m-6m=
m-2m-3m+4m-5m-6m+···+2002m-2003m-2004m
m-2m-3m+4m-5m-6m=m-2m-3m+4m-5m-6m+···+2002m-2003m-2004m
m-2m-3m+4m-5m-6m+···+2002m-2003m-2004m
= [(1-2-3)+(4-5-6)+···(2002-2003-2004)]m
= -(4+7+11+···+2005)m
= -668*(4+2005)m/2
= -671006m
等差数列公式:
Sn=n(a1+an)/2
an=a1+(n-1)d
可将每三项结合算得-4m-7m-10m-……-2005m提出负号得-(4m+7m+……+2005m)此为等差数列,公差为3m,再根据等差数列求和公式【(a1+an)*3m}/2得结果。
= (1-2-3+4-5-6)m
= -11m
(m+3m+5m+...+2015m)-(2m+4m+6m+...+2014m)=
m-2m-3m+4m-5m-6m+7m.2004m=?
(m+3m+5m.+2013m)-(2m+4m+6m+.+2012m)=?
计算:(m+3m+5m+...+2009m)-(2m+4m+6m+...+2008m)
(m+3m+5m+...+2009m)-(2m+4m+6m+...2008m)
(m+3m+5m+...+2014m)-(2m+4m+6m+...+2013m)
(m+3m+5m+...+2013m)-(2m+4m+6m+...+2012m)
计算:(m+3m+5m+...+2009m)-(2m+4m+6m+...+2010m)
(m+3m+5m+7m+.+2009m)-(2m-4m-6m-.-2008m)=?
m-2m-3m+4m-5m-6m+7m-8m-9m+...+2002m-2003m-2004m求m的值
计算(m+3m+5m……+2009m)—(2m+4m+6m+2008m)=
计算:(m+3m+5m+…+2015m)-(2m+4m+6m+…+2014m)=
计算(m+3m+5m+.+2009m)-(2m+4m+6m+.+2010m)=多少
(m+3m+5m+...+2011m)-(2m+4m+6m+...+2012m)=多少
计算:(m+3m+5m+…+2011m)-(2m+4m+6m+…+2010m)=
(m+3m+5m+...+2011m)-(2m+4m+6m+...+2012m)=多少
计算(m+3m+5m+...+2011m)-(2m+4m+6m+...+2010m)=
计算(m+3m+5m+7m+.+2009m)-(2m+4m+6m+.+2008m)