Question

Thu gọn tổng sau :

a) Q = 1 + 3² + 3⁴ +...+ + 3²⁰²³

^{ai nhanh tớ tick}

Answer 1

Sửa đề: Q=1+3^2+3^4+...+3^2022

9Q=3^2+3^4+...+3^2024

=>8Q=3^2024-1

=>\(Q=\dfrac{3^{2024}-1}{8}\)