1/1*2=1/1-1/2;1/2*3=1/2-1/3;1/3*4=1/3-1/4;1/4*5=1/4-1/5...1/n(n-1)=?1/1*2+1/2*3+...+1/99*100
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![1/1*2=1/1-1/2;1/2*3=1/2-1/3;1/3*4=1/3-1/4;1/4*5=1/4-1/5...1/n(n-1)=?1/1*2+1/2*3+...+1/99*100](/uploads/image/z/7109584-16-4.jpg?t=1%2F1%2A2%3D1%2F1-1%2F2%3B1%2F2%2A3%3D1%2F2-1%2F3%3B1%2F3%2A4%3D1%2F3-1%2F4%3B1%2F4%2A5%3D1%2F4-1%2F5...1%2Fn%28n-1%29%3D%3F1%2F1%2A2%2B1%2F2%2A3%2B...%2B1%2F99%2A100)
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1/1*2=1/1-1/2;1/2*3=1/2-1/3;1/3*4=1/3-1/4;1/4*5=1/4-1/5...1/n(n-1)=?1/1*2+1/2*3+...+1/99*100
1/1*2=1/1-1/2;1/2*3=1/2-1/3;1/3*4=1/3-1/4;1/4*5=1/4-1/5...1/n(n-1)=?1/1*2+1/2*3+...+1/99*100
1/1*2=1/1-1/2;1/2*3=1/2-1/3;1/3*4=1/3-1/4;1/4*5=1/4-1/5...1/n(n-1)=?1/1*2+1/2*3+...+1/99*100
1/1*2=1/1-1/2;
1/2*3=1/2-1/3;
1/3*4=1/3-1/4;
1/4*5=1/4-1/5
...
1/n(n-1)=1/(n-1)-1/n
1/1*2+1/2*3+...+1/99*100
=(1/1-1/2)+(1/2-1/3)+(1/3-1/4)+(1/4-1/5)+...+(1/99-1/100)
=1/1- 1/100
=99/100