1/1x2=1-1/2,1/2x3=1/2-1/3,1/3x4=1/3-1/4.那么1/2x4+1/4x6+1/6x8.

来源：学生作业帮编辑：大师作文网作业帮分类：数学作业时间：2024/11/10 19:42:00

1/1x2=1-1/2,1/2x3=1/2-1/3,1/3x4=1/3-1/4.那么1/2x4+1/4x6+1/6x8.1/2006x2007=?

=1/2*(1/2-1/4+1/4-1/6+1/6-1/8+……+1/2004-1/2006)+1/2006-1/2007
=1/2*(1/2-1/2006)+1/2006-1/2007
=1/4+1/4012-1/2007
=502754/2013021
=0.24975

1x2+2x4+3x6+4x8 ------------------------------- 2x3+4x6+6x9+ 1x2/1+2x3/1+3x4/1+.+2009x2010/1=? 2x4/1+4x6/1+6x8/1+.+2010x2 （1x2+2x4+3x6+4x8）/（2x3+4x6+6x9+8x12) 1/1x2=1-1/2,1/2x3=1/2-1/3,1/3x4=1/3-1/4.那么1/2x4+1/4x6+1/6x8. x8+x7+x6+x5+x4+x3+x2+x+1因式分解 1x2+2x4+3x6+4x8+5x10+.+20x40 怎么算? 1x2+2x4+3x6+4x8+5x10+.+20x40 简便计算计算：1/1x2+1/2x3+1/3x4+1/4x5+1/5x6+1/6x7+1/7x8+1/8x9+1/9x10. 2x2/1x3+4x4/3x5+6x6/5x7+8x8/7x9+10x10/9x11+12x12/11x13 仔细看看 1.如果1+X+X2+X3=0,求X+X2+X3+X4+X5+X6+X7+X8的值为? 一道数学题:如果1+x+x2+x3=0,求x+x2+x3+x4+x5+x6+x7+x8的值 1x1-2x2+3x3-4x4+5x5-6x6.-100x100+101x101