b₃ = 40 q = - 4
b₃ = b₁ * q²
b₁ = b₃ : q² = 40 : (- 4)² = 40 : 16 = 2,5
Ответ : b₁ = 2,5
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Verified answer
b₃ = 40 q = - 4
b₃ = b₁ * q²
b₁ = b₃ : q² = 40 : (- 4)² = 40 : 16 = 2,5
Ответ : b₁ = 2,5