1/1x2+1/2X3+1/3X4+~+1/2005X2006
1/1x2+1/2x3+1/3x4+1/4x5.1/2005x2006=?
1/1x2+1/2X3+1/3X4+~+1/2005X2006
1/1x2+1/2x3=1/3x4+...+1/2005x2006+1/2006x2007=
x+x2=-1 1+x+x2+x3+x4+……+x2005+x2006+x2007的值
已知x2+x+!=0求1+x+x2+x3+x4.+x2006的值
请教一道小学数学题,1/1x2+1/2x3+1/3x4+1/4x5+.1/2005x2006怎么算?说明思路.谢谢!
已知:X5+X4+X3+X2+X+1=0,求X2008+X2007+X2006+.+X809=?
x6+x5+x4+x3+x2+x+1=0,求x2003+x2004+x2005+x2006+x2007+X2008=?
求线性方程组 x2-x3-x4=0 x1+x2-x3+3x4=1 x1-x2+x3+5x4=-1 x1+2x2-2x3+
1+2x4-(x2+2x3)
X1+2X2-X3+X4=1
求齐次线性方程组x1+2x2+x3+x4+x5=1 2x1+4x2+3x3+x4+x5=2 -x1-2x2+x3+3x4