1/()+1/()+1/()+1/()+1/()+1/()=1
(-1+1/100)*(-1+1/101)*(-1+1/102)*.*(-1+1/2010)
1+1=()
(1/1000-1)×(1/999-1)×(1/998-1)×...×(1/2-1)
(1-1/4)(1-1/9)(1-1/16).(1-1/10000)
(2009/1-1)×(2008/1-1)×(2007/1-1)×.×(1001/1-1)×(1000/1-1)
(1998/1-1)(1997/1-1)(1996/1-1)...(1001/1-1)(1000/1-1)
(1/2014-1)(1/2013-1)(1-2012-1)...(1/3-1)(1/2-1)
(1/2015-1)*(1/2014-1)*(1/2013-1)*...*(1/1001-1)*(1/1000-1)
(1+2/1)(1+4/1)(1+6/1).(1+10/)(1-3/1)(1—5/1).(1-9/1)
(1+1/2)*(1+1/4)*(1+1/6)*...*(1+1/2008)*(1-1/3)*(1-1/5)*(1-1/
(1/2008-1)*(1/2007-1)*(2006-1).(1/1001-1)*(1/1000-1)