q = bn+1/bn = -3bn/bn = -3
S7 = b1(qⁿ-1)/(q-1) = -2*((-3)⁷-1)/(-3-1) = -2*(-2187-1)/(-4) = -2*(-2188)/(-4) = 4376/(-4) = -1094
Ответ: -1094
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q = bn+1/bn = -3bn/bn = -3
S7 = b1(qⁿ-1)/(q-1) = -2*((-3)⁷-1)/(-3-1) = -2*(-2187-1)/(-4) = -2*(-2188)/(-4) = 4376/(-4) = -1094
Ответ: -1094