Question

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Answer 1

Răspuns:

Explicație pas cu pas:

3) b₁ = 2 ; q = 1/2

b₆ = b₁·q⁵ = 2·(1/2)⁵ = 1/2⁴ = 1/16

b₆ = 1/16

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4) {a₅+a₈ = 0

   {a₇-a₅ = -8 <=>

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{a₁+4r+a₁+7r = 0

{a₁+6r-a₁-4r = -8 <=>

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{2a₁+11r = 0

{2r = -8 => r = -4

a₁ = -11r/2 = -11·(-4)/2 = 44/2 = 22

a₁ = 22 ; r = -4