1/5x8+1/8x11+1/11x14+.+1/98x101=
因式分解:X15+X14+X13+X12+X11+X10+X9+X8+X7+X6+X5+X4+X3+X2+X+1
裂项法1/2X5+1/5x8+1/8x11.1/2009x2012=?
1/2x5+1/5x8+1/8x11+.+1/32x35
2x5/1+5x8/1+8x11/1+.2006x2009/1+2009x2012/1 用裂项法计算
1/2x5+1/5x8+1/8x11+…………+1/2003x2006+1/2006x2009 = 这是我儿子的小学作业
2x2/1x3+4x4/3x5+6x6/5x7+8x8/7x9+10x10/9x11+12x12/11x13 仔细看看
求数列1/2x5,1/5x8,1/8x11...,1/(3n-1)(3n+2)...的前n项和
求前n项和1.1/(2X5),1/(5X8),1/(8X11)...2.2^2/(1X3),4^2/(3X5),6^2/
model:Min=x1+x2+x3+x4+x5+x6+x7+x8+x9+x10+x11+x12+x13+x14+x15
(5\8+1\27)X8+19\27
1X8+1=9,12X8+2=98,123x8+3=987,1234x8+4=9876找规律把下面,□填上数字
1x8+1=9,12x8+2=98,123x8+3=987,1234x8+4=9876照样子继续