1\1x3+1\3x5+1\5x7+1\7x9+.+1\99x101=
1/1x3+1/3x5+1/5x7+……+1/99x101
1/1x3+1/3x5+1/5x7+1/7x9+1/9x11=?
2/1x3+2/3X5+2/5x7=2/7x9+2/9x11
经典奥数题11/1x3+1/3x5+1/5x7.1/99x101解题思路请写清楚
计算:1/1x3+1/3x5+1/5x7+1/7x9+……+1/2011x2013
1X3分之一+3X5分之一+5X7分之一+7X9分之一加到2009X2011分之一怎么算,
已知1-1/3=2/1x3,计算1/1x3+1/3x5+1/5x7+1/7x9+1/9x11=
1+2X3+4X5+6X7+8X9=303
2/1x3 + 2/3x5 + 2/5x7 +······+ 2/97x99 + 2/99x101 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
1x1-2x2+3x3-4x4+5x5-6x6.-100x100+101x101