2009-2008+2007-2006+2005-2004+…+3-2+1
=（2009-2008）+（2007-2006）+（2005-2004）+…+（3-2）+1
=1+1+1+…+1+1
=1005
故答案為：1005．
2009-2008+2007-2006+2005-2004+…+3-2+1=_．
2009-2008+2007-2006+2005-2004+…+3-2+1=______．
數(shù)學(xué)人氣：710 ℃時(shí)間：2020-05-19 04:36:46
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