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cun se aduna un sir de fractii avand numere consecutive la numarator si numitorul comun? ex: 1/100+2/100+......+99/100

Răspuns :

1/100+2/100+......+99/100=(1+2+..+99)/100=100*99/2*1/100=99/2=49,5
[tex]= \frac{1}{100} *(1+2+3+...+99)\\ = \frac{1}{100} * \frac{99*(99+1)}{2} \\ = \frac{99*100}{100*2} \\ = \frac{99}{2}\\ =49.5 [/tex]