2x4/1+4x6/1+6x8/1.+96x98/1+98x100/1=
2x4+4x6+6x8+.+98x100
1x2+2x4+3x6+4x8 ------------------------------- 2x3+4x6+6x9+
1x1-2x2+3x3-4x4+5x5-6x6.-100x100+101x101
1X2+2X4+3X6+.50X100
(1x2+2x4+3x6+4x8)/(2x3+4x6+6x9+8x12)
1/2x4+1/4x6+1/6x8+…+1/2010x2012 怎么算!
1/2x4+1/4x6+1/6x8+.+1/2010x2012
2X4分之一+4X6分之一+6X8分之一+…+2010X2012分之一= n(n+1)分之一=
已知x4+x3+x2+x+1=0,求x100+x99+x98+x97+x96的值.
1x2/1+2x3/1+3x4/1+.+2009x2010/1=? 2x4/1+4x6/1+6x8/1+.+2010x2
1x2+2x4+3x6+4x8+5x10+.+20x40 怎么算?
1x2+2x4+3x6+4x8+5x10+.+20x40 简便计算