計算(1-1/2)*(1-1/3)*(1-1/4)*······(1-1/2006)*(1-1/2007)

計算(1-1/2)*(1-1/3)*(1-1/4)*······(1-1/2006)*(1-1/2007)

1-1/2)*(1-1/3)*(1-1/4)*······(1-1/2006)*(1-1/2007)=1/2X2/3X3/4…X2006/2007=1/2007