[tex]\displaystyle 1)(3a-2)^2+(3a-1)(2a+1)-(3-11a)^2=\\9a^2-12a+4+6a^2+3a-2a-1-(9-66a+121a^2)=\\9a^2-12a+4+6a^2+3a-21-1-9+66a-121a^2=-106a^2+55a-6\\\\2)27y^2(x-y)-(x-3y)^3+x^3=\\27xy^2-27y^3-(x^3-9x^2y+27xy^2-27y^3)+x^3=\\27xy^2-27y^3-x^3+9x^2y-27xy^2+27y^3+x^3=9x^2y[/tex]