计算,1/2x4+1/4x6+1/6x8+.+1/48x50=?,1/2+1/6+1/12+1/20+1/30+1/42
1x2+2x4+3x6+4x8 ------------------------------- 2x3+4x6+6x9+
1x2+2x4+3x6+4x8+5x10+.+20x40 简便计算
探究并计算:1/2x4+1/4x6+1/6x8+…+1/2012x2014
(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
1x2+2x4+3x6+4x8+5x10+.+20x40 怎么算?
2X4分之一+4X6分之一+6X8分之一+…+2010X2012分之一= n(n+1)分之一=
x8+x7+x6+x5+x4+x3+x2+x+1因式分解
1x2/1+2x3/1+3x4/1+.+2009x2010/1=? 2x4/1+4x6/1+6x8/1+.+2010x2
1/2x4+1/4x6+1/6x8+...+1/198x200 求解题过程及答案.
计算:1/1x2+1/2x3+1/3x4+1/4x5+1/5x6+1/6x7+1/7x8+1/8x9+1/9x10.