po uproszczeniu wyrażenia (a:a³)⁻¹: a⁻⁴ otrzymamy ... ?
= (a⁻²)⁻¹ : a⁻⁴ = a² : a⁻⁴ = a ⁶
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= (a⁻²)⁻¹ : a⁻⁴ = a² : a⁻⁴ = a ⁶