若1/2+1/6+1/12+.+1/x(x+1)=2013/2014,则x=?

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若1/2+1/6+1/12+.+1/x(x+1)=2013/2014,则x=?
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若1/2+1/6+1/12+.+1/x(x+1)=2013/2014,则x=?
若1/2+1/6+1/12+.+1/x(x+1)=2013/2014,则x=?

若1/2+1/6+1/12+.+1/x(x+1)=2013/2014,则x=?
1/1×2+1/2×3+1/3×4+.+1/x(x+1)=2013/2014
1-1/2+1/2-1/3+1/3-1/4+……++1/x-1/(x+1)=2013/2014
1-1/(x+1)=2013/2014
1/(x+1)=1/2014
x+1=2014
x=2013

1/2+1/6+1/12+....+1/x(x+1)=2013/2014
1/1x2+1/2x3+1/3x4+……+1/x(x+1)=2013/2014
1-1/2+1/2-1/3+1/3-1/4+……+1/x-1/(x+1)=2013/2014
1-1/(x+1)=1-1/2014
x+1=2014
x=2013

由于1/[x(x+1)]=1/x-1/(x+1)
所以,1/2+1/6+1/12+...+1/x(x+1)
=(1-1/2)+(1/2-1/3)+(1/3-1/4)+(1/4-1/5)+...+1/x-1/(x+1)
=1-1/(x+1)

既然1-1/(x+1)=2013/2014,那么,x=2013
完毕

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