1、 - 2, 4, - 8, 16, - 32 2、 - 4, 8, - 16, 32, - 64 Write the nth number of each group and calculate the first eight of each group 1、 - 2, 4, - 8, 16, - 32 2、 - 4, 8, - 16, 32, - 64 Write the nth number of each group and calculate the sum of the first eight in each group

1、 - 2, 4, - 8, 16, - 32 2、 - 4, 8, - 16, 32, - 64 Write the nth number of each group and calculate the first eight of each group 1、 - 2, 4, - 8, 16, - 32 2、 - 4, 8, - 16, 32, - 64 Write the nth number of each group and calculate the sum of the first eight in each group

(- 2) nth power - 2,4, - 8,16, - 32,64, - 128256, the sum of the first eight terms = 94
2 * (- 2) n power - 4,8, - 16,32, - 64128, - 256512, the sum of the first eight terms = 340