-1*1/2+(-1/2*1/3)+(-1/3*1/4)+···+(-1/2010*1/2011)
-1*1/2+(-1/2*1/3)+(-1/3*1/4)+···+(-1/2010*1/2011)
计算 1*2/1+2*3/1+3*4/1+············+2009*2010/1
1、(1+3+5+···+2009+2011)-(2+4+6+···+2010+2012)
(2012分之1-1)×(2011分之1-1)×(2010分之1-1)···(4分之1-1)×(3分之1-1)×(2分之
(1+3+5······+2007+2009+2011)-(2+4+6+·····+2006+2008+2010)
2010·(1-1/2)·(1-1/3)·(1-1/4)·…·(1-1/2010)
(-1)+2+(-3)+4+······+(-2009)+2010+(-2011)=__________________
1/2+1/2+3+1/2+3+4+···+1/2+3+4+···+200
(1)2010×(1-1/2)×(1-1/3)×(1-1/4)×·········×(1-1/2009)×(1-1/20
计算1/1*2+1/2+3+1/3*4+···+1/2009*2010+1/2011*2012的值
数列 1/2,3/2,1/3 ,4/3,·········1/n+1,n+2/n+1,·········是否有极限?
1+2-3-4+5+···+2007+2008-2009-2010+2011