1/1X3+1/3X5+…….+1/99X101
1/1x3+1/3x5+1/5x7+……+1/99x101
1x1-2x2+3x3-4x4+5x5-6x6.-100x100+101x101
经典奥数题11/1x3+1/3x5+1/5x7.1/99x101解题思路请写清楚
1x2+2x3+3x4+4x5······100x101答案是几?
2/1x3 + 2/3x5 + 2/5x7 +······+ 2/97x99 + 2/99x101 简便计算
1、1x5分之1+5x9分之1+9x13分之1+……+97x101分之一是多少?
1x5+2x5+3x5+4x5+5x5… 麻烦给我一个公式.
1x2/1+2x3/1+3x4/1+4x5/1+…+39x40/1
1/1x3+1/3x5+1/5x7+…+1/2011x2013是多少?
求解一个方程急 X(1次方)+X2+X3=5 X2+X3+X4=1 X3+X4+X5=-5 X4+X5+X1=-3 X5
解方程组X2+X3+X4=1 X1+X2+X3=5 X3+X4+X5=-5 X4+X5+X1=-3 X5+X1+X2=2
解一道方程组x1+x2+x3=5,x2+x3+x4=1,x3+x4+x5=-5,x4+x5+x1=-3,x5+x1+x2