1.a2（x-1）+b2(1-x) =a^2(x-1)-b^2(x-1)=(x-1)(a^2-b^2)=(x-1)(a+b)(a-b) 2.4x^3y^3+4x^2y^3+xy^3 =.xy^3（4x^2+4x+1 ）=.xy^3（2x+1 ）^23.3(x-1)2-18(x-1)+27=3【(x-1)2-6(x-1)+9】=3（x-1-3）2=3（x-4）2...