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(3/(4 π) (2^x (0.2/10^6)^3))^(1/3) - (3/(4 π) (2^(x - 1) (0.2/10^6)^3))^(1/3)<3×10^8
(3/(4 π) (2^x (0.2/10^6)^3))^(1/3) - (3/(4 π) (2^(x - 1) (0.2/10^6)^3))^(1/3)<3×10^8
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