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- The new exercise book for the third grade of mathematics is 34 pages 3 1 topic (the teacher tears the answer)
The new exercise book for the third grade of mathematics is 34 pages 3 1 topic (the teacher tears the answer)
1/ 1*2+ 1/2*3+ 1/3*4+...+ 1/99* 100
= 1- 1/2+ 1/2- 1/3+ 1/3- 1/4+...+ 1/99- 1/ 100
= 1- 1/ 100
=99/ 100
Formula:1/n (n+1) =1/n-1(n+1)
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