1×1/2+1/2×1/3+1/3×1/4+.+1/2009×1/2010 简便方法
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1×1/2+1/2×1/3+1/3×1/4+.+1/2009×1/2010简便方法1×1/2+1/2×1/3+1/3×1/4+.+1/2009×1/2010简便方法1×1/2+1/2×1/3+1/3×
1×1/2+1/2×1/3+1/3×1/4+.+1/2009×1/2010 简便方法
1×1/2+1/2×1/3+1/3×1/4+.+1/2009×1/2010 简便方法
1×1/2+1/2×1/3+1/3×1/4+.+1/2009×1/2010 简便方法
1×1/2+1/2×1/3+1/3×1/4+.+1/2009×1/2010
=(1 - 1/2)+(1/2 - 1/3 )+(1/3 - 1/4 )+.+(1/2009 - 1/2010 )
=1 - 1/2010
=2009/2010