-(1／2009－1/2008)＋[-(1/2008-1/2007)]＋┈＋[-(1/2－1)]
=1-1/2+...+1/2007-1/2008+1/2008-1/2009
=1-1/2009
=2008/2009
-(1／2009－1/2008)＋[-(1/2008-1/2007)]＋┈＋[-(1/2－1)]
1个回答
相关问题
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|1/2009-1/2008|-|1/2008-1/2007| =1/2008-1/2009-1/2007+1/2008
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(1+1/2007+1/2008)*(1/2007+1/2008+1/2009)-(1+1/2007+1/2008+1/
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1/(√2009+√2008)+1/(√2008+√2007)+.+1/(√3+√2)+1/(√2+1)
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化简：|1/2010-1/2009|+|1/2009-1/2008|+|1/2008-1/2007|-|1/2007-1
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|1/2009-1/2008|+|1/2008-1/2007|+……+|1/3-1/2|+|1/2-1|=?
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2008+2009*2007/2008*2009-1
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1/1*2+1/2*3+1/3*4+...+1/2007*2008+1/2008*2009
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数学题哈化简 |1/2010-1/2009|+|1//2009-1/2008|+|1/2008-1/2007|-|1/2
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奥数题绝对值|1/2009-1/2008|+|1/2008-1/2007|+|1/2007-1/2006|
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（1-1/2008）+（2-1/2008*2）+（3-1/2008*3）+...+（2007-1/2008*2007）+