N1 2 14x5+11x3+3-15x-4x2+x3-10= Sisy "y -6yg2 + 3y22-yy2= 23 b) 2xy - 9 x2y2 + 4x + 5y3x2=10+1

a) $$14x^5+11x^3+3-15x-4x^2+x^3-10 = 14x^5 + (11x^3 + x^3) - 4x^2 - 15x + (3 - 10) = 14x^5 + 12x^3 - 4x^2 - 15x - 7$$

б) $$5y^4 - 6y^4 + 3y^3 - y^3 - y^2 = (5y^4 - 6y^4) + (3y^3 - y^3) - y^2 = -y^4 + 2y^3 - y^2$$

в) $$2xy^2 - 9x^2y^3 + 4x + 5y^3x^2 - 10 + 1 = 2xy^2 + (-9x^2y^3 + 5x^2y^3) + 4x + (-10 + 1) = 2xy^2 - 4x^2y^3 + 4x - 9$$

Ответ: a) $$14x^5 + 12x^3 - 4x^2 - 15x - 7$$, б) $$-y^4 + 2y^3 - y^2$$, в) $$2xy^2 - 4x^2y^3 + 4x - 9$$