化简1/1*2=1-1/2,1/2*3=1/2-1/3,1/3*4=1/3-1/4则1/(x-1)x+1/x(x+1)+1/(x+1)(x+2)+..+1/(x+9)(x+10)=
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因为不能确定a与b之间的关系
如果a=b时
1/ab
1/(a
1)(b
1)
1/(a
2)(b
2)
......1/(a
2005)(b
2005)
=1/a²
1/(a
1)²
1/(a
2)²
...
1/(a
2005)²
如果a≠b时
1/ab
1/(a
1)(b
1)
1/(a
2)(b
2)
......1/(a
2005)(b
2005)
=1/(b-a)[1/a-1/b
1/(a
1)-1/(b
1)
1/(a
2)-1/(b
2)
...
1/(a
2005)-1/(b
2005)]
如果a=b时
1/ab
1/(a
1)(b
1)
1/(a
2)(b
2)
......1/(a
2005)(b
2005)
=1/a²
1/(a
1)²
1/(a
2)²
...
1/(a
2005)²
如果a≠b时
1/ab
1/(a
1)(b
1)
1/(a
2)(b
2)
......1/(a
2005)(b
2005)
=1/(b-a)[1/a-1/b
1/(a
1)-1/(b
1)
1/(a
2)-1/(b
2)
...
1/(a
2005)-1/(b
2005)]
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