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b*(b³)²:b³ b*b⁶:b³ b⁴
( ------------------)⁻¹ = ( ------------ )⁻¹ = ( -------------)⁻¹ = b⁴ - b
b⁸ - b⁵ b⁸ - b⁵ b⁴(b⁴ - b)