Agar \(a_{n} = 4n^{ 2 } + 2n - 80\) bo‘lsa, \( S_{ 7 } \) ning qiymatini kiriting. $$ S_{ 7 } = \sum_{i = 1}^{ 7 } a_i $$
119. Sonli ketma-ketlikning dastlabki n ta hadi yig‘indisi
Ushbu sahifaga havola:
https://itboom.uz/m119/
