1x2+2x4+3x6+.+1005x2010
1x2+2x4+3x6+.+1005x2010
1x2/1+2x3/1+3x4/1+.+2009x2010/1=? 2x4/1+4x6/1+6x8/1+.+2010x2
1X2+2X4+3X6+.50X100
1x2+2x4+3x6+4x8 ------------------------------- 2x3+4x6+6x9+
(1x2+2x4+3x6+4x8)/(2x3+4x6+6x9+8x12)
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
已知:|X1-1|+|X2-2|+|X3-3|+.+|X200292009|+|X2010-2010|=0 求x2010
已知x4+x3+x2+x+1=0,求1+x+x2+...+x2010的值
1/1X2+1/2X3+1/3X4+1/4X5+1/5X6……1/2007X2008
1x2/1+2x3/1+3x4/1+4x5/1+5x6/1+6x7/1