1x2+2x4+3x6+4x8+5x10+.+20x40 简便计算
1x2+2x4+3x6+4x8+5x10+.+20x40 简便计算
1x2+2x4+3x6+4x8+5x10+.+20x40 怎么算?
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
1x2+2x4+3x6+4x8 ------------------------------- 2x3+4x6+6x9+
2x3十4x6十6x9十8x12十10x15分之1x2十2x4十3x6十4x8十5x10.
(1x2+2x4+3x6+4x8)/(2x3+4x6+6x9+8x12)
2x2+4x4+6x6+.20x20怎么简便计算
1x2/1+2x3/1+3x4/1+.+2009x2010/1=? 2x4/1+4x6/1+6x8/1+.+2010x2
算数题 求解1/1X2+1/2X3+1/3X4+1/4X5+1/5X6+1/7X8要过程
小学六年级数学简便方法计算1/15x8+1/3x2+2/15x6怎么算?
因式分解:X15+X14+X13+X12+X11+X10+X9+X8+X7+X6+X5+X4+X3+X2+X+1