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Câu 8:

Cho cấp số cộng $({u_n})$

Câu 8: Cho cấp số cộng (un)({u_n})(un​)thỏa :$\left\{ {\begin{array}{*{20}{c}}{{u_5} + 3{u_3} - {u_2} = - 21}\\{3{u_7} - 2{u_4} = - 34}\end{array}} \right.$. Tính tổng 15 số hạng đầu của cấp số ;

Thông tin câu hỏi

Câu 8:

Cho cấp số cộng $({u_n})$ thỏa :$\left\{ {\begin{array}{*{20}{c}}{{u_5} + 3{u_3} - {u_2} = - 21}\\{3{u_7} - 2{u_4} = - 34}\end{array}} \right.$. Tính tổng 15 số hạng đầu của cấp số ;