(1+1/2)*(1+1/3)*(1+1/4)~*(1++1/18)*(1+1/19)*(1+1/20)
(1-1/2)*(1-1/3)*(1-1/4)*(1-1/5)*(1-1/6)*…*(1-1/19)*(1-1/20)=
(1-1/2+1/3-1/4+……+1/19-1/20)/[1/(11×20)+1/(12×19)+……+1/(15×1
200*(1-1/2)*(1-1/3)*(1-1/4)*.*(1-1/100)
(1+1/2)*(1+1/4)*(1+1/6)*...*(1+1/2008)*(1-1/3)*(1-1/5)*(1-1/
(1-1/2)×(1-1/3)×(1-1/4)×(1-1/5)×(1-1/6)×…×(1-1/19)×(1-1/20)=
(1-1/2)*(1-1/3)*(1-1/4)…(1-1/20),简便算法
(1+2/1)(1+4/1)(1+6/1).(1+10/)(1-3/1)(1—5/1).(1-9/1)
(1-2分之1)×(1-3分之1)×(1-4分之1)×.×(1-19分之一)X(1-20分之一)怎么算?
(1-1/2)*(1-1/3)*(1-1/4)*.*(1-1/1998)*(1-1999)
1 1 1 1 1(1- -)(1- -)(1- -)...(1- - )(1- - )=?2 3 4 2007 200
聪明人进0.0! 数学计算题:(1-1/2*1/2)*(1-1/3*1/3)*(1-1/4*1/4)*.*(1-1/20
计算 ( 1+1/2)*(1-1/3)*(1+1/4)*(1-1/5)*.*(1+1/1000)*(1-1/1001)