|-2a|*|a-1| jeśli aє(-∞;-1)
|-2a| * |a - 1| = -(-2a) * [ -(a - 1) ] = 2a * (1 - a) = 2a - 2a²
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|-2a| * |a - 1| = -(-2a) * [ -(a - 1) ] = 2a * (1 - a) = 2a - 2a²