a₁ = - 6,5 a₂ = - 6 Sₙ = - 42,5 n = ?
a₂ = a₁ + d
d = a₂ - a₁ = - 6 - (- 6,5) = - 6 + 6,5 = 0,5
Ответ : 10 членов
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a₁ = - 6,5 a₂ = - 6 Sₙ = - 42,5 n = ?
a₂ = a₁ + d
d = a₂ - a₁ = - 6 - (- 6,5) = - 6 + 6,5 = 0,5
Ответ : 10 членов