а) 3x^2 * (x^3 - 5x) + 15x^3 = 3x^5 - 15x^3 + 15x^3 = 3x^5
б) 4a^3 - 2a(a - 2a^2 + 1) = 4a^3 - 2a^3 + 4a^3 - 2a = 8a^3 - 2a^2 - 2a
в) 0.8ac^2 + a^2 - (a - c^2) * a = 0.8ac^2 + a^2 - a + c^2
г) x^3 + (x - 5) * (- x^2) + x^2 = x^3 - x^3 + 5x^2 + x^2 = 6x^2
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а) 3x^2 * (x^3 - 5x) + 15x^3 = 3x^5 - 15x^3 + 15x^3 = 3x^5
б) 4a^3 - 2a(a - 2a^2 + 1) = 4a^3 - 2a^3 + 4a^3 - 2a = 8a^3 - 2a^2 - 2a
в) 0.8ac^2 + a^2 - (a - c^2) * a = 0.8ac^2 + a^2 - a + c^2
г) x^3 + (x - 5) * (- x^2) + x^2 = x^3 - x^3 + 5x^2 + x^2 = 6x^2