做一个长方体抽屉,用了下面几 长方体形的木板.A 1X6 B 1X4 C 2X6 D 4X6 E1 X6 F 1X4 (

1x2+2x4+3x6+4x8 ------------------------------- 2x3+4x6+6x9+ （1x2+2x4+3x6+4x8）/（2x3+4x6+6x9+8x12) 1X2+2X4+3X6+.50X100 1x2+2x4+3x6+.+1005x2010 x8+x7+x6+x5+x4+x3+x2+x+1因式分解 1/2x4+1/4x6+1/6x8+…+1/2010x2012 怎么算! 1/2x4+1/4x6+1/6x8+.+1/2010x2012 2x4分之1+4x6分之1……2010x2012分之1=?为什么 1/2x4十1/4x6十…十1/100X102 1x2+2x4+3x6+4x8+5x10+.+20x40 怎么算? 1x2+2x4+3x6+4x8+5x10+.+20x40 简便计算 1x1-2x2+3x3-4x4+5x5-6x6.-100x100+101x101