-15х^3y^2 + 20х^4
вот
5x^2(-3y^2x)+5x^2*4x^2=-15x^3y^2+20x^4
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-15х^3y^2 + 20х^4
вот
5x^2(-3y^2x)+5x^2*4x^2=-15x^3y^2+20x^4