1/(2x4)+1/(4x6)+1/(6x8)+...+1/(2006x2008)=
1/2x4+1/4x6+1/6x8+……+1/2006x2008初一的数学题,求答案.急大神们帮帮忙
1x2+2x4+3x6+4x8 ------------------------------- 2x3+4x6+6x9+
(1x2+2x4+3x6+4x8)/(2x3+4x6+6x9+8x12)
1/2x4+1/4x6+1/6x8+…+1/2010x2012 怎么算!
1/2x4+1/4x6+1/6x8+.+1/2010x2012
2X4分之一+4X6分之一+6X8分之一+…+2010X2012分之一= n(n+1)分之一=
1x2/1+2x3/1+3x4/1+.+2009x2010/1=? 2x4/1+4x6/1+6x8/1+.+2010x2
1x2+2x4+3x6+4x8+5x10+.+20x40 怎么算?
1x2+2x4+3x6+4x8+5x10+.+20x40 简便计算
1/1X2+1/2X3+1/3X4+1/4X5+1/5X6……1/2007X2008
1/2x4+1/4x6+1/6x8+...+1/198x200 求解题过程及答案.
探究并计算:1/2x4+1/4x6+1/6x8+…+1/2012x2014