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Câu 16:

Cho dãy số $({u_n})$

Câu 16: Cho dãy số (un)({u_n})(un​) với $\left\{ {\begin{array}{*{20}{c}}{{u_1} = - 1}\\{{u_{n + 1}} = \dfrac{{{u_n}}}{2}}\end{array}} \right.$ Công thức số hạng tổng quát của dãy số này là :

Thông tin câu hỏi

Câu 16:

Cho dãy số $({u_n})$ với $\left\{ {\begin{array}{*{20}{c}}{{u_1} = - 1}\\{{u_{n + 1}} = \dfrac{{{u_n}}}{2}}\end{array}} \right.$ Công thức số hạng tổng quát của dãy số này là :