Автор - koshka2412

Дано: b1=
 frac{1}{64}
b2=
 frac{1}{18}
b3=
 frac{1}{6}

Найти:S6

Ответ

Автор - asialoban

b2 = b1 * q

q = b2/b1 = 1/18 : 1/64 = 64/18 = 32/9

Sn = (b1(q^n - 1))/(q - 1)

S6 = (1/64((32/9)^6 - 1))/(32/9 - 1) ≈ 12

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