Объяснение:
b4 = S4 - S3 = 170 - 42 = 128 = b*q³ = 2*64 = 2*4³
S5 = 2*(1 - 4⁵)/(1-4) = 2*(-1023)/(-3) = 682
b1 = 2, q = 4, S5 = 682 - ответ
2, 8, 32, 128, 512 - члены прогрессии.
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Объяснение:
b4 = S4 - S3 = 170 - 42 = 128 = b*q³ = 2*64 = 2*4³
S5 = 2*(1 - 4⁵)/(1-4) = 2*(-1023)/(-3) = 682
b1 = 2, q = 4, S5 = 682 - ответ
2, 8, 32, 128, 512 - члены прогрессии.