в геометрической прогрессии
b8=2^-12, b10=2^-14
b1-?

b₁₀ = b₈* q²q² = b₁₀ : b₈q² = 2^ (-14)/2^(-12)q² = 2^(-2)=(1/2)^2q = 1/2 = 2^ (-1)b₈ = b₁*q⁷b₁ = b₈/q⁷b₁ = 2^(-12)/2^(-7)b₁ = 2^ (-5)