計算:(1/2006-1)(1/2005-1)(1/2004-1)……(1/3-1)(1/2-1)
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計算:(1/2006-1)(1/2005-1)(1/2004-1)……(1/3-1)(1/2-1)
計算:(1/2006-1)(1/2005-1)(1/2004-1)……(1/3-1)(1/2-1)
計算:(1/2006-1)(1/2005-1)(1/2004-1)……(1/3-1)(1/2-1)
(1/2006-1) (1/2005-1) (1/2004-1).(1/3-1)(1/2-1) =-(1- 1/2)*(1- 1/3)*(1- 1/4)*...*(1- 1/2005)(1-1/2006) ==-1/2*2/3*3/4*.*2004/2005*2005/2006 抵消 =-1/2006