1-1/2-1/6-1/12-1/20.-1/2011*2012
1-1/2-1/6-1/12-1/20.-1/2011*2012
1/2+1/6+1/12+1/20.+1/380
1-1/2-1/6-1/12-1/20-.1/2011*2012
计算:1-2分之1-6分之1-12分之1-...-2011×2012分之1
1/6+1/12+1/20.+1/9900=?
解方程1/2+1/6+1/12+1/20+1/x(x+1)=2011/2012
|1/2013-1/2012|+ |1/2012-1/2011|+|1/2011-1/2010|-|1/2010-1/2
(1/2012-1)(1/2011-1)(1/2010-1)...(1/3-1)(1/2-1)咋算
(2013/1-1)(2012/1-1)(2011/1-1).(3/1-1)(2/1-1)
(1\2012-1)(1\2011-1)(1\2010-1)...(1\3-1)(1\2-1)=?
1-1/2-1/6-1/12-1/20...-1/99×100用简便算法算,/号是分数线
(-1*1/2)+(-1/2*1/3)+(-1/3*1/4)+.+(-1/2011*1/2012)