B₄=b₁*q³
q³=b₄ : b₁
q³ = 1/2 : 1/128 = 1/2 * 128/1 = 64
q³ = 64
q = ∛64 = 4
q = 4
b₁=1/128
b₂ = b₁*q
b₂ = 1/128 * 4 = 1/32
b₃ = b₂*q
b₃ = 1/32 * 4 = 1/8
b₄ = 1/8 * 4 = 1/2
b₅ = b₄*q
b₅=1/2*4 = 2
b₆ = b₅*q
b₆ = 2 * 4 =8
b₇ = b₆*q
b₇ = 8*4 = 32
Ответ: 1/128; 1/32; 1/8; 1/2; 2; 8; 32; ...