发布网友 发布时间:2024-10-24 15:10
共1个回答
热心网友 时间:2024-11-05 00:55
a7 = a1 * q的6次方
所以,q的6次方 = a7/a1 = -96/(-1.5) =
所以,q = 2
sn = a1*(1-q的n次方) / (1-q) = -1.5 * ( 1 - 2的n次方)/ (1-2) = 1.5*(1-2的n次方)
热心网友 时间:2024-11-05 00:53
a7 = a1 * q的6次方
所以,q的6次方 = a7/a1 = -96/(-1.5) =
所以,q = 2
sn = a1*(1-q的n次方) / (1-q) = -1.5 * ( 1 - 2的n次方)/ (1-2) = 1.5*(1-2的n次方)