共50条信息
已知数列\(\{a_{n}\}\)的前\(9\)项和为\(153\),且点\(P(a_{n},an+1)(n∈N*)\)在直线\(x-y+3=0\)上.
\((1)\)求数列\(\{a_{n}\}\)通项公式:
\((2)\)从数列\(\{a_{n}\}\)中,依次取出第\(2\)项、第\(8\)项、第\(24\)项,\(……\),第\(n·2^{n}\)项,按原来的顺序组成一个新的数列\(\{b_{n}\}\),求数列\(\{b_{n}\}\)的前\(n\)项和\(S_{n}\).
进入组卷