[已解决]求分数序列前N项和

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1. n = int(input())
   
2. fz = 2
   
3. fm = 1
   
4. tot = 0
   
5. for i in range(n):
   
6.     fs = fz / fm
   
7.     fz, fm = fz + fm, fz
   
8.     tot += fs
   
9. print(f'{tot:.2f}')
   

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