Zapisz wyrażenie w prostszej postaci.
(5x-4y do kwadraty)(4x do kwadratu - 5y)
(5x-4y²)(4x²-5y) = 20x³ - 25xy - 16x²y² + 20y³
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(5x-4y²)(4x²-5y) = 20x³ - 25xy - 16x²y² + 20y³