急求高手解答1/1x2+1/2x3+1/3x4+1/4x5+.+1/2007x2008+1/2008x2009帮忙列出每
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急求高手解答1/1x2+1/2x3+1/3x4+1/4x5+.+1/2007x2008+1/2008x2009帮忙列出每个步骤,
1/1x2+1/2x3+1/3x4+1/4x5+.+1/2007x2008+1/2008x2009
=(1-1/2)+(1/2-1/3)+(1/3-1/4)+...+(1/2008-1/2009)
=1-1/2009
=2008/2009
学了数列 裂项 后 就会做了
再问: 你好。这步往下 =(1-1/2)+(1/2-1/3)+(1/3-1/4)+...+(1/2008-1/2009) 这步往下直接就是 =1-1/2009 =2008/2009 这两步了么?
=(1-1/2)+(1/2-1/3)+(1/3-1/4)+...+(1/2008-1/2009)
=1-1/2009
=2008/2009
学了数列 裂项 后 就会做了
再问: 你好。这步往下 =(1-1/2)+(1/2-1/3)+(1/3-1/4)+...+(1/2008-1/2009) 这步往下直接就是 =1-1/2009 =2008/2009 这两步了么?
急求高手解答1/1x2+1/2x3+1/3x4+1/4x5+.+1/2007x2008+1/2008x2009帮忙列出每
1/1x2+1/2x3+1/3x4+1/4x5+```````+1/2008x2009=?
1/1x2+1/2x3+1/3x4+1/4x5+1/5x6+......1/2008x2009
1/1X2+1/2X3+1/3X4+1/4X5+1/5X6……1/2007X2008
1/1x2+1/2x3+1/3x4+1/4x5+.+1/2007x2008=多少 怎么计算
解方程组x1+x2=x2+x3=x3+x4=……=x2007+x2008=x2008+x2009=1,x1+x2+x3+
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
求齐次线性方程组x1+2x2+x3+x4+x5=1 2x1+4x2+3x3+x4+x5=2 -x1-2x2+x3+3x4
2/1X2+2/2X3+2/3X4+……+2/2007X2008等于多少(需要过程)急!
解方程组X2+X3+X4=1 X1+X2+X3=5 X3+X4+X5=-5 X4+X5+X1=-3 X5+X1+X2=2