Issasistefy2ask
a fost răspuns

S=1/1*2 +1/2*3+ 1/3*4+.........1/2020*2021​

Răspuns :

PisPisPufosask

Răspuns:

S = 2020/2021

Explicație pas cu pas:

S = 1/1×2 + 1/2×3 + 1/3×4 + .. + 1/2020×2021​

putem rescrie relatia astfel

S = (1/1 - 1/2) + (1/2 - 1/3) + .. + (1/2020 - 1/2021)

reducem

S = 1/1 - 1/2021

S = 2021/2021 - 1/2021

S = 2020/2021

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