1/(1*2)+1/(1*2+2*3)+1/(1*2+2*3+3*4)+...+1/(1*2+...+18*19)=?
其中會用到1/(1*2*3)+1/(2*3*4)+1/(3*4*5)+...+1/[n(n+1)(n+2)]=?的計算技巧
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1/(1*2)+1/(1*2+2*3)+1/(1*2+2*3+3*4)+...+1/(1*2+...+18*19)=?
其中會用到1/(1*2*3)+1/(2*3*4)+1/(3*4*5)+...+1/[n(n+1)(n+2)]=?的計算技巧

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