Ответы на вопрос:
B₂ - b₄ = 8 b₃- b₁ = - 24 b₁q - b₁q³ = 8 b₁q² - b₁ = - 24 b₁q(1 - q²) = 8 - b₁(1 - q²) = - 24 b₁q(1 - q²) = 8 b₁(1 - q²) = 24 q = 1/3 b₁ = 24/(8/9) = 27 b₁ = 27; b₂ = 9; b₃ = 3; b₄ = 1
1) 5х+6х=2211 11х=2211 х=2211/11=201 2) 23х+х-10=38 24х=38-10 х=28/24=7/6 3)1457: (7+8х)=47 (7+8х)=1/31 4) 1,5х-0,2х+1,4х+291,6 2,7х+291,6
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