1/2+1/6+1/12.+1/2011*2012
1/2*4+1/4*6+1/6*8+1/8*10+1/10*12.+1/2010*2012
1-1/2-1/6-1/12-1/20.-1/2011*2012
1-1/2-1/6-1/12-1/20-.1/2011*2012
|1/2013-1/2012|+ |1/2012-1/2011|+|1/2011-1/2010|-|1/2010-1/2
[(2012^2-2011*2012)/(2011^2-2010*2011)-1]*2011
1/2+(1/4+3/4)+(1/6+3/6+5/6)+.(1/2012+3/2012+.+2011/2012)等于
计算:1-2分之1-6分之1-12分之1-...-2011×2012分之1
2010 1/2+(-2011 5/6)+(-2012 2/3)+2013 1/3+(-1 1/2)
1/2*1+1/3*2+1/4*3+1/5*4+1/6*5+.1/2012*2011的值
(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)=?