1/1x2+1/2x3+1/3x4+L+1/2004x2005 怎么算?
2个回答
我的小清新呢v,
1/1×2+1/2×3+1/3×4+.+1/2004×2005
=1-1/2+1/2-1/3+1/3-1/4+.+1/2004-1/2005
=1-1/2005
=2004/2005
相关问题
1x1-2x2+3x3-4x4……-2004x2004+2005x2005
1x1/2+2x1/3+3x1/4+.2004x1/2005=?
1x2/1+2x3/1+3x4/1.2004x2005/1
2500/2x1+2500/2x3+2500/3x42500/ 4x5.2005/2004x2005怎么算?
1x2/2005+2x3/2005+3x4/2005+4x5/2005+.+2004x2005/2005=?
初一数学在线解答1/1x2+1/2x3+.+1/2002x2003+1/2003x2004+1/2004x2005
2007x2006-2006x2005+2005x2004-2004x2003.+3x2-2x1
请教一道小学数学题,1/1x2+1/2x3+1/3x4+1/4x5+.1/2005x2006怎么算?说明思路.谢谢!
1/(x+1)(x+2)+1/(x+2)(x+3)+1/(x+3)(x+4)+...1/(x+2005)(x+2006)
(1)(x+1) 2 -x(x-2) (2) (3) (4)2004×2006×2008-2005 2 ×2008