1+3+9+27+81+…+177147=?
5个回答
等比数列求和,公比q=3÷1=3
1+3+9+27+81+…+177147
=(1-177147×3)/(1-3)
=265720
可追问,望采纳@
相关问题
1+3+9+27+81+.+177147如何简算.急急急急急急急急急急急急急急急急!
1+3+9+27+81+……+3∧99
观察下面三行数,-3,9,-27,81,-243…… 1,13,-23,85,-239…… 1,-3,9,-27,81
观察下面三行数,-3,9,-27,81,-243…… 1,13,-23,85,-239…… 1,-3,9,-27,81
1+3+9+27+81+243+729
81.9,27.3,9.1,____ 找规律填空.
观察下面三行数:-3,9,-27,81,-243,…-5,7,-29,79,-245,…-1,3,-9,27,-81…(
-3,9,-27,81,-243.
-3,9,-27,81,-243,……;
1+3+9+27+81+...+3的N次方