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Rafaella
(+5x) . (-4x^2) = 1x^2 (-2x) . (+3x) = 1x (+5x) . (+4x) = 20x d) (-n) . (+6n) = 5M (-6x^2) . (+3x^2) = 3x^2 (-2y) . (5y) = 3y
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