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treetree0303
2 năm trước
Cho` (a_1)/(a_2) = (a_2)/(a_3) = (a_3)/(a_4) = .... = (a_2019)/(a_2020)` và `(a_1)/(a_2020) = ((-5)/2)^2019` Tính ` S = (a_1 + a_2 + a_3 + ... + a_2019)/(a_2 + a_3 + a_4 + ... + a_2020)`
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