Question

Помогите,пожалуйста.Можно просто ответ, без решения

Answer 1

Решение
1) b₅ = 32 ; q = - 2
b₅ = b₁ * q⁴
b₁ = b₅/q⁴ = 32/(-2)⁴ = 2
b₂ = b₁*q = 2*(-2) = - 4
2)  b₄ = 3/8 ; q = 1/2
b₄ = b₁*q³
b₁ = b₄/q³ = 3/8 : (1/2)³ = 3
S₄ = [b₁ - b₄*q)/(1 - q)
S₄ = [3 - (3/8)*(1/2)] / (1 - 1/2) = (3 - 3/16) / 0,5 =
= (45*2)/16 = 45/8
3)  b₃ = 2/9
q = - 1/3
b₃ = b₁*q²
b₁ = b₃/q³ = (2/9) : (- 1/3)² = 2
b₂ = b₁*q = 2 * (- 1/3) = - 2/3
b₁ + b₂ = 2 + (- 2/3) = 1 (1/3) = 4/3
4)  b₅ = 16
q = 2
b₅ = b₁ * q⁴
b₁ = b₅/q⁴ =16/2⁴ = 1
b₃ = b₁*q² = 1 * 2² = 4
S₃ = (b₁ - b₃*q)/(1 - q)
S₃ = (1 - 4*2)/(1 - 2) = 7
5)  b₁ = 1
q = √2
b₁₅ = b₁*q¹⁴ = 1 * (√2)¹⁴ = 2⁷ = 128
S₁₅ = (b₁ - b₁₅*q)/(1 - q) = (1 - 128√2)/(1 - √2)