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= 5x.25x²+(-y).25x²+5x.(-5xy)+
(-y).(-5xy)+5x.y²+(-y).y²)
= 125x^3 - 25x²y - 25x²y + 5xy² +
5xy² - y^3
= 125x^3 - y^3 - 50 x²y + 10xy²