a) x ² - y ² - 2x + 2y b) 2x+2y - x ² - xy c) x ² - 25 + y ² + 2xy d) 4x ² - 25 + (2x+7)(5-2x) e) x ³ + x ²y - 4x - 4y f) 3(x+4) - x ² -4x Chi tiết và nhanh giúp tớ nhé!

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