1.(a+b)(a^2-ab+b^2)=a^3-a^2b+ab^2+a^2b-ab^2+b^3=a^3+b^32.(a^2+3)(a-2)-a(a^2-2a-2)=a^3-2a^2+3a-6-a^3+2a^2+4=3a-6+4=3a-23.(2x-1)^2-(3x+1)(3x-1)+5x(x-1)=(2x-1)^2-9a^2+1+5x^2-5x=4x^2-4x+1-9a^2+1+5x^2-5x=-...