№14 Упростить: 1) $$12.5x^2 + y^2 - (8x^2 - 5y^2 - (-10x^2 + (5.5x^2 - 6y^2))))$$; 2) $$0.6ab^2 + (2a^3 + b^3 - (3ab^2 - (a^3 + 2.4ab^2 - b^3)))$$.

1) $$12.5x^2 + y^2 - (8x^2 - 5y^2 - (-10x^2 + (5.5x^2 - 6y^2))))$$ $$12.5x^2 + y^2 - (8x^2 - 5y^2 - (-10x^2 + 5.5x^2 - 6y^2)))$$ $$12.5x^2 + y^2 - (8x^2 - 5y^2 - (-4.5x^2 - 6y^2))$$ $$12.5x^2 + y^2 - (8x^2 - 5y^2 + 4.5x^2 + 6y^2)$$ $$12.5x^2 + y^2 - (12.5x^2 + y^2)$$ $$12.5x^2 + y^2 - 12.5x^2 - y^2 = 0$$ 2) $$0.6ab^2 + (2a^3 + b^3 - (3ab^2 - (a^3 + 2.4ab^2 - b^3)))$$ $$0.6ab^2 + (2a^3 + b^3 - (3ab^2 - a^3 - 2.4ab^2 + b^3))$$ $$0.6ab^2 + (2a^3 + b^3 - (0.6ab^2 - a^3 + b^3))$$ $$0.6ab^2 + 2a^3 + b^3 - 0.6ab^2 + a^3 - b^3$$ $$3a^3$$ Ответ: 1) 0; 2) $$3a^3$$.